Status Legend: A= Active Company ID C= Cancelled – no payment/updated information in over 2 years
OB: Out of Business P= Pending Payment I= Inactive – no payment/updated information in the past 6 months
| Co ID | Status | Company Name | Address 1 | Address 2 | City | State | ZIP | 24×7 Phone | Area Supported by 24 hr TN | Type of Local Services |
|---|---|---|---|---|---|---|---|---|---|---|
| 0467 | A | Smithville Telephone Company | 63470 Hwy 25 N | PO Box 117 | Smithville | MS | 38870 | 662-651-4131 | MS | Facility |
| 0590 | A | Benton Ridge Telephone Company | 140 Main Street | Benton Ridge | OH | 45816-0180 | 419-859-2144 | OH | ILEC | |
| 0920 | A | Niagra Telephone Company | 1133 Main Street | PO Box 3 | Niagara | WI | 54151 | 751-251-3116 | Florence County WI | Facility |
| 1020 | A | Grafton Telephone Company | 119 East Main | PO Box 188 | Grafton | IL | 62037 | 618-786-3311 | Grafton, IL | ILEC |
| 1088 | A | Wabash Telephone Cooperative | PO Box 299 | Louisville | IL | 62858 | 618-665-3311 | IL | Telco | |
| 1358 | A | Blue Earth Valley Telephone | 123 W. 7th Street | Bllue Earth | MN | 56013 | 507-526-3252 | MN, IA | Facility | |
| 1431 | A | Midwest Telephone Company | 222 Clayborn Ave. S | PO Box 45 | Parkers Prairie | MN | 56361 | 218-338-4000 | MN | LEC |
| 1440 | A | Cannon Valley Telecom Inc. | 202 North First Street | Bricelyn | MN | 56014 | 507-653-4444 | Cities: Bricelyn, Morristown, Freeborn, Frost | LEC | |
| 1448 | A | Osakis Telephone Company | 27 Main St. E | Osakis | MN | 56360 | 320-859-2700 | MN | LEC | |
| 1453 | A | The Peoples Telephone Co. | 206 Main Ave. | PO Box 96 | Bigfork | MN | 56628 | 218-743-6000 | MN | LEC |
| 1854 | A | Grafton Technologies, Inc. | 301 Commerce Blvd. | PO Box 428 | Jerseyville | IL | 62052 | 618-639-4841 | Jerseyville, IL | CLEC |
| 21CEN | A | 21st Century Insurance | 1945 Lakepointe Drive | Lewisville | TX | 75057 | 972-956-4901 | TX | PBX | |
| 21ST | C | (Cancelled) 21st Century Telecom Group, Inc. | 350 N Orleans Street, 6th Floor | Chicago | IL | 60654-1509 | 888-790-2121 | IL | Facility | |
| 2233 | A | Rural Telephone Company | 892 West Madison Avenue | Glenns Ferry | ID | 83623 | 208-366-2614 | ID | Facillity | |
| 2C2 | OB | (Out of Business) 2nd Century Communications | 7701 Woodland Center Blvd., Suite 50 | Tampa | FL | 33614 | 800-440-9235 | All States | Facility | |
| AATI | A | Plan B Communications | 655 Shrewsbury Avenue Suite 302 | Shrewsbury | NJ | 07702 | 888-773-9722 | NY | Facility | |
| ABN | A | Austin Bestline | 500 N. Cap. Of TX Hwy., Bldg. 8, Ste. 200 | Austin | TX | 78746 | 888-808-8847 | Austin, Houston, Dallas, San Antonio, TX | Facility | |
| ABQ26 | C | (Cancelled) Net-Tel Corporation | 1023 31st St. NW | Washington | DC | 20007 | 800-561-2903 | NY, Chicago, Los Angeles | CLEC | |
| ABS | C | (Cancelled) Adelphia Business Solutions | 200 Technology Dr. | Pittsburgh | PA | 15219 | 800-292-2314 | PA | CLEC | |
| ACC | I | (Inactive) Akron Canton Communications | 2930 Edison St., NW, Ste. C | Uniontown | OH | 44685 | 330/699-5699 | OH | Reseller | |
| ACCB | A | Arrowhead Communications Corp. | 211 Main St. | Hector | MN | 55342-0428 | 800-992-8857 | US | LEC | |
| ACCES | A | Accessible Wireless | 100 Via de la Valle | Suite 200 | Del Mar | CA | 92014 | 949-439-2888 | CA, AZ | Wireless |
| ACDEL | A | ACD Telecom | 4980 Northwind Dr. | East Lansing | MI | 48823-5089 | 517-204-5669 | MI | Facility | |
| ACECM | A | Ace Telephone DBA Ace Communications Group | 207 E Cedar | PO Box 360 | Houston | MN | 55943-0360 | 507-896-3107 | MN, IA | Facility |
| ACELK | A | Ace Link Telecommunications Inc. | 207 E. Cedar | PO Box 360 | Houston | MN | 55943-0360 | 507-896-3107 | MN, 725 Exchange 507 area code | CLEC |
| ACEMI | A | Ace Telephone Company of MI, Inc. | 5351 N. M37 | PO Box 69 | Mesick | MI | 49668 | 231-885-9900 | MI | Facility |
| ACG | OB | (Out of Business) Advanced Communicatons Group | 5710 LBJ Freeway | Suite 215 | Dallas | TX | 75240 | 877-333-2555 | TX, KS, MO, OK | CLEC |
| ACI | A | ALLTEL Communications, Inc. | 1 Allied Drive | Little Rock | AR | 72203 | 800-392-0186 | ALL | Facility | |
| ACIW | A | Alltel Communications Inc. | 1 Allied Drive | Bldg 5 | Little Rock | AR | 72203 | 800-392-0186 | ALL | Wireless |
| ACME | A | Acme Communications, Inc. | 618 Franklin Square | Michigan City | IN | 46360 | 219-879-6600 | IN | Facility | |
| ACN61 | A | Arrival Communications | 1800 19th Street | Bakersfield | CA | 93301 | 888-950-2100 | CA | Facility | |
| ACS | A | Arvig Communication Systems, Inc. | 150 2nd Avenue SW | Perham | MN | 56573 | 218-346-5500 | MN | LEC, CLEC | |
| ACSAK | A | Alaska Communications Systems | 600 Telephone Avenue | MS – 16 | Anchorage | AK | 99503 | 907-564-1642 | AK | LEC |
| ACSI | A | Xspedius Management Company | 5555 Winghaven Blvd. | O’Fallon | MO | 63366 | 800-937-7473 | AL, AR, AZ, CO, DC, FL, GA, KS, KY, LA, MD, MO, MS, NC, NM, | Facility | |
| ACT | A | Advanced Communications Technology, Inc. | 60 W. Seymour St. | P. O. Box 7039 | Sheridan | WY | 82801 | 307-675-0900 | Sheridan, WY | Facility |
| ACTCO | A | Action Communications, Inc. | 315 West 27th Street | Scottsbluff | NE | 69361 | 308/632-7836 | NE | Facility | |
| ACTEL | C | (Cancelled) Actel Integrated Communications, Inc. | 1509 Government Street, Suite 300 | Mobile | AL | 36604 | 877-700-9400 | ALL | ICP | |
| ACWAK | A | Alaska Communications Systems | 600 Telephone Avenue | MS 28 | Anchorage | AK | 99503 | 907-564-1642 | AK | Facility |
| ADI | A | Analog Devices | 804 Woburn Street | Wilmington | MA | 01887 | 781-937-2880 | Two buildings in Wilmington | PBX | |
| ADMIN | ALL (Administrative) | ALL (For ESCO Code Management) | ||||||||
| ADVG | A | Advantage Cellular Systems | 34030 Nashville Hwy | Alexandria | TN | 37012 | 615-464-2355 | TN RSA #2 | Carrier | |
| ADVTL | A | Advanced Telephone | 913 S. Burnside | Gonzales | LA | 70737 | 225-621-4288 | LA | CLEC | |
| AENCO | C | (Cancelled) Aeneas Communications | 105 South Missouri Street | Jackson | TN | 38301 | 731-554-9200 | TN | Facility | |
| AERL | OB | (Out of Business) Aerial Communications | 12920 SE 38th St | Bellevue | WA | 98006 | 206-663-7927 | USA | Wireless | |
| AFMTC | C | (Cancelled) Ayrshire Farmers Mutual Telephone Co | 1405 Silver Lake Avenue | P. O. Box 248 | Ayrshire | IA | 50515 | 712-426-2800 | Ayrshire & Gillett Grove Iowa | LEC |
| AFNI | A | American Fiber Network, Inc. | 9401 Indian Creek Parkway, Ste. 140 | Overland Park | KS | 66210 | 800/864-0583 | MO, KS, UT | UNE-P, Res | |
| AFNTY | A | Affinity VoIP Telecom, Inc. | 10200 SW Allan Blvd. | Suite D | Beaverton | OR | 97005 | 503-564-4611 | All | Reseller |
| AGTEL | A | Alhambra-Grantfork Telephone Company | 114 Wall Street, PO Box 207 | Alhambra | IL | 62001 | 618-488-2165 | IL – Alhambra Village, Grantfork Village | Facility | |
| AGW | OB | (Out of Business) Airgate Wireless, Inc. | 233 Peachtree Street N.E. | Suite 1700 | Atlanta | GA | 30303 | 888-859-1400 | SC, NC, GA | Wireless |
| AHF | A | Castleberry Telephone Co, Inc. | 1881 Cleveland Ave. | PO Box 37 | Castleberry | AL | 36432 | 251-966-2118 | AL | LEC |
| AIN | A | Access Integrated Networks | 4885 Riverside Drive | Suite 304 | Macon | GA | 31201 | 812-319-4624 | GA, KY, TN, FL, AL, NC, SC | Facility |
| AIRLK | C | (Cancel) AirLink Telephone | 3400 Gull Road | Kalamazoo | MI | 49048 | 616/618-2040 | MI | Wireless | |
| AIRPK | A | AIRPEAK Communications LLC | 4690 Longley Lane | Suite 25 | Reno | NV | 87950 | 775-828-7000 | NV, CA, WA, NM | Wireless |
| AJF | A | Aero Communications, LLC | 1301 Broadway | Suite 126 | Paducah | KY | 42001 | 270-331-4247 | KY, IL | Facility |
| AJJ | A | Alta Municipal Utilities (Altatec) | 223 Main Street | Alta | IA | 51002 | 712/200-1122 | IA | Facility | |
| AKDIG | I | (Inactive) Alaska Digitel | 3127 Commercial Drive | Anchorage | AK | 99501 | 907-222-9222 | AK | Facility | |
| ALC | A | Accessline Communications Corporation | 11202 SE 8th Street | Suite 200 | Bellevue | WA | 98004 | 206-654-1030 | ALL | Facility |
| ALCI | C | (Cancelled – see LOGIX) WCI d/b/a Logix Communications | 2950 N. Loop West | Suite 1200 | Houston | TX | 77092 | 713-850-0990 | TX | Facility |
| ALGN | A | Algona Municipal Utilities | 104 West Call Street | PO Box 10 | Algona | IA | 50511 | 515/295-3584 | IA | CLEC |
| ALLO | A | Allo Communications LLC | 610 Braodway | PO Box 699 | Imperial | NE | 69033 | 816-716-7224 | Scottsbluff, NE | Facility |
| ALLTL | A | ALLTEL Communications Inc | 50 Executive Parkway | Bldg 1 | Hudson | OH | 44236 | 800-782-6206 | OH, PA, NY, VA, WV, TN, KY | Facility |
| ALLU | OB | (Out of Business) All Utilities, LLC | 4904 Lockgreen Circle | Richmond | VA | 23230 | 804-359-3711 | Cherfield | Switch | |
| ALMA | A | Alma Telephone Company | 206 S. Country Road | PO Box 127 | Alma | MO | 64001 | 660-674-2297 | MO | ILEC |
| ALNT | C | (Cancelled) Alltel Communications, Inc. | 1440 M Street | Lincoln | NE | 68508 | 800-678-7169 | NE, IA, KS | Facility | |
| ALOHA | A | Bing Enterprises | 733 Bishop Street | Suite 170 | Honolulu | HI | 96813-4002 | 808-356-2901 | HI | VoIP |
| ALPHA | P | Alpha Phone, Inc. | 1279 37th Street | Floor 2 | Brooklyn | NY | 11218 | 718-436-4919 | LATA 132 | Facility |
| ALPIN | A | Alpine Communications | 923 Humphrey Street | PO Box 1008 | Elkader | IA | 52043 | 800/635-1059 | IA | Facility |
| ALPMI | I | (Inactive) Alpine-Michigan | 2136 West M-32 | Gaylord | MI | 49735 | 800/968-7335 | MI, MA | Cellular | |
| ALT | A | Venus Telephone Co. | County Line Rd. Box 75 | Venus | PA | 16364 | 814-354-6123 | Counties: Venango, Clarion, Forest | ILEC | |
| ALTEA | A | ALTEA USA | 606 Johnson Avenue | Bohemia | NY | 11716 | 888-242-5832 | US, Canada | Reseller | |
| ALTI | C | (Cancelled) Allegiance Telecom, Inc. | 9201 N. Central Expwy. | 4B | Dallas | TX | 75231 | 800-459-8496 | USA | CLEC |
| ALWIR | OB | (Out of Business) Alambama Wireless, Inc. | 303-G Beltline Place SW | Decatur | AL | 35603 | 256-308-2922 | AL-Morgan, Cullman, Blount, Lawrence, Franklin, Marion, and | Cellular | |
| AMATL | A | AMA Communications LLC dba AMA TechTel Communications | 4909 Canyon Dr. | Amarillo | TX | 79110 | 806-322-2222 | TX | Facility | |
| AMBT | A | American Broadband & Telecommunications | 5703 N. Main Street | Suite B1 | Sylvania | OH | 43560 | 419-466-9314 | OH, MI | Facility |
| AMC | OB | (Out of Business) American MetroComm | 1615 Poydras | New Orleans | LA | 70112 | 504-200-2118 | LA | CLEC | |
| AMCC | C | (Cancelled) Ashford Meadows Cable & Comm | 2551 Cornelia Road | Herndon | VA | 20171 | 804-288-5500 | VA | CLEC | |
| AMCCC | A | AMCOM Communications Corporation | 2973 Harbor Blvd | #163 | Costa Mesa | CA | 92626 | 714-307-1777 | CA | Reseller |
| AMCEL | A | American Cellular Wireless | 3910 South Ave | Youngstown | OH | 44512 | 423-318-2139 | TN4,KY4,KY6,KY8,NY5,NY6,MN6,MN2,MN3,MN4,OH7,WV1,WV2,PA9 | WSP | |
| AMCI | C | (Cancelled) Ameritech Cellular Services | 8888 Keystone Crossing | Suite 300 | Indianapolis | IN | 46270 | 847-765-5300 | IN, IL, WI, OH, MI, MO | Cellular |
| AMCOM | A | American Com | 7344 South Alton Way | Suite 8D | Centennial | CO | 80112 | 877-410-1663 | CO | Reseller |
| AMCVA | A | Augusta Medical Center | 78 Medical Center Dr. | Fishersville | VA | 22939 | 540-332-4000 | VA | Hospital | |
| AMERI | A | AmeriMex Communications Corp | 20 Mansell Court E | Suite 200 | Roswell | GA | 30076 | 214-647-3367 | National | CLEC Facility, CLEC Reseller, CLEC UNE |
| AMH01 | A | Amherst College | Converse Hall Rm B-1B | 100 Boltwood Ave | Amherst | MA | 01002 | MA | PBX | |
| AMICA | C | (Cancelled) Y-12 Wireless, d/b/a Amica Wireless | 1 Pierce Place | Itasca | IL | 60143 | 309-262-9757 | IL | Facility | |
| AMTCA | A | Agate Mutual Telephone Coop Assoc. | 38619 Monroe Street | Agate | CO | 80101 | 719/764-2578 | CO | Facility | |
| AMTCH | A | Ameritech | 2140 Davidson Road | Waukesha | WI | 53186 | 888-424-3911 | IL, MI, OH, IN, WI | ILEC | |
| ANALO | A | Analog Devices | 3 Technology Way | Building 2 | norwood | MA | 02062 | 781-461-3500 | Norwood Campus, 3 buildings | PBX |
| ANC | A | Advanced Network Communications, LLC | 111 West Second Street | Schaller | IA | 51053 | 712-275-4861 | IA | Facility, Reseller | |
| ANI | C | (Cancelled) American Network, Inc. | 60 East 56th Street | New York | NY | 10022 | 917-854-7600 | USA | Facility | |
| ANN | P | Ann Taylor | 7 Times Square | New York | NY | 10036 | 212-541-3341 | NY | PBX/PS911/Shared Tenant VoIP | |
| ANN2 | P | Ann Taylor, Inc. | 476 Wheelers Farms Road | Milford | CT | 06460 | 212-541-3343 | CT | VoIP | |
| AOINC | A | Access One, Inc. | 820 W Jackson Blvd. | Suite 650 | Chicago | IL | 60607 | 312-441-9971 | IL | Facility |
| AOL | A | AOL | 22265 Pacific Blvd. | Creative Center 6, 65A:H05 | Sterling | VA | 20166 | 703-265-4667 | USA | VoIP |
| API | C | (Cancelled) Access Point Inc. | 1100 Crescent GreenSuite 109 | Cary | NC | 27511 | 919-505-7029 | NC, SC | Facility | |
| APOG | A | Apogee Telecom | 715 West 23rd Street | Suite M | Austin | TX | 78705 | 888-245-0608 | TX | Reseller |
| ARBRS | C | (Cancelled) Arbros Communications, Inc. | 8181 Professional Pl, Suite 150 | Landover | MD | 20785 | 877-427-2767 | ALL | Facility | |
| ARC | A | ARC Networks dba InfoHighway Communications | 1333 Broadway, Ste. 1001 | New York | NY | 10018 | 888/272-6389 | CT | Reseller | |
| ARCAD | A | Arcadia Telephone | 200 Center St. | Arcadia | IA | 51430 | 712-689-2238 | IA | Facility | |
| ARLLN | A | Arialink Telecom | 1223 Turner | Suite A | Lansing | MI | 48906 | 517-492-1350 | MI | CLEC |
| ARMST | A | Armstrong Utilities | One Armstrong Place | Butler | PA | 16001 | 724/899-2211 | PA | PBX | |
| ARNG1 | A | Vermont Army National Guard | Telecommunications Center | 179 Vermont National Guard Road | Colchester | VT | 05446-3099 | 802-338-3050 | VT | PBX |
| ARPS | A | Amherst Regional Public Schools | 170 Chestnut St. | Amherst | MA | 01002 | 413-362-1810 | MA | Facility | |
| ART | A | Artisan Communications | 12400 State Highway 71 West | Suite 350-407 | Austin | TX | 78738 | 866-733-8878 | KS | VoIP |
| ARTCH | C | (Cancelled) AirTouch Communications | 3350 161st Avenue S.E. PO Box 7329 | Bellevue | WA | 98008-1329 | 800-445-5514 | WA, OR, ID, UT, CO, AZ, NM, NE, WY, ND, MN, IA | ILEC | |
| ASI | OB | (Out of Business) Asset Sentinel Inc. | 7578 Market Place Drive | Eden Prarie | MN | 55344 | 612-934-2655 | USA | PBX | |
| ASPEN | I | (Inactive) Aspen Datacom | 4646 N. Ravenwood | 2nd Floor | Chicago | IL | 60640 | 773-878-3161 | IL | Facility |
| ASUMP | A | Assumption College | 500 Salisbury Street | Worchester | MA | 01609 | 508/767-7000 | MA | Faciltiy | |
| AT&T | A | AT&T | 900 Rt. 202/206 | Room 4B122 | Bedminster | NJ | 07921 | 888-249-4980 | USA | ALL |
| ATBLS | A | AT&T | One AT&T Way | Suite 4B122 | Bedminster | NJ | 07921 | 800-275-0014 | CA | UNE-P |
| ATC | A | Alma Telephone Company, Inc. | 101 Mercer Street | Alma | GA | 31510 | 912-632-5911 | GA | Facility | |
| ATCMD | A | Armstrong Telephone Company – Maryland | 122 S. Queen Street | Rising Sun | MD | 21911-0709 | 410-658-5511 | Rising Sun, MD | Facility | |
| ATCN | A | Armstrong Telephone Company – North | 693 Main St. | Duke Center | PA | 16729 | 814-966-3207 | Duke Center, PA | Facility | |
| ATCND | C | (Cancelled) Armstrong Telephone Co Northern Div. | 600 East North St. | Harrisville | WV | 26362 | 304-643-2921 | Counties in WV – Harrisville, Cairo, Ellenboro, Lawford, Smi | Facility | |
| ATCNE | A | ATC Communications | 524 Nebraska Ave. | PO Box 300 | Arapahoe | NE | 68922-0300 | 308/962-8400 | NE | Facility |
| ATCNY | A | Armstrong Telephone Company | 136 East Front St. | Addison | NY | 14801 | 607-359-2211 | Cities in NY – Addison, Troupsburg, Woodhull, Whitesville | Facility | |
| ATCO | A | Ardmore Telephone Company Inc. | 30190 Ardmore Avenue | Ardmore | AL | 35739 | 256-423-2122 | AL, TN | Facility | |
| ATCPA | A | Armstrong Telephone Company – PA | 1755 State Route 30 | Clinton | PA | 15026 | 724-899-2211 | Clinton, Murdocksville, PA | Facility | |
| ATCWV | C | (Cancelled) Armstrong Telephone Company – WV | 311 Main St. | Hamlin | WV | 25523 | 724-824-5111 | Hamlin, WV | Facility | |
| ATGI | A | Eschelon Telecom, Inc. | 730 2nd Ave. S | Suite 900 | Minneapolis | MN | 55402 | 888-611-6621 | CA, NV, OR, WA | Facility |
| ATHR | A | The Arthur Mutual Telephone Co. | Attn: Janet Sholl | 21980 State Route 637 | Defiance | OH | 43512-9308 | 419-393-2233 | OH | LEC |
| ATIAR | P | Armstrong Telecommunications, Inc | One Armstrong Place | Butler | PA | 16001 | 877-277-5709 | NY, WV, KY, PA, OH, MD | CLEC Facility | |
| ATIMN | C | (Cancelled – see ESCH) ATI | 730 Second Avenue | Suite 1200 | Minneapolis | MN | 55402 | 612-964-5794 | MN | Facility |
| ATLAS | I | (Inactive) Atlas Electric Devices | 4114 N Ravenswood | Chicago | IL | 60613 | 773-327-4520 | IL | Facility | |
| ATMC | A | Atlantic Telephone Membership Corp | 620 Whiteville Rd SE | Shallotte | NC | 28459 | 910-754-1730 | NC: County of Brunwick | Facility | |
| ATS | C | (Cancelled) ATS Telecommunications | 5851 San Felipe St, Ste. 950 | Houston | TX | 77057 | 888-326-3302 | TX | Facility | |
| ATSLC | C | (Cancelled) ATS Services, LLC | 3408 W 26TH Street | Chicago | IL | 60623-4001 | 888-675-6347 | Illinois Counties: Cook, Kane, Lake, McHenry, DuPage, Will | Reseller | |
| ATTBB | A | Insight Phone of Kentucky, LLC | 10200 Linn Station Road | Suite 100 | Louisville | KY | 40233 | 800-771-9124 | OH | Facility |
| ATTCS | A | AT&T Consumer Services, Inc | 900 Rt. 202/206 | Room 4B122 | Bedminster | NJ | 07921 | 888-249-4980 | ALL | CLEC |
| ATTI | C | (Cancelled) A-Tech Telecom, Inc. | 2040 W. Spring Creek Pkwy. | Unit #141, PMB #293 | Plano | TX | 75023-4225 | 972-527-2488 | TX,KY,AR | UNE |
| ATTLS | A | AT&T | One AT&T Way | Room4B122 | Bedminster | NJ | 07921 | 800-275-0014 | CA, NV | Reseller |
| ATTPS | C | (Cancelled) AT&T | 900 Rt. 202/206 North, Room 4B124E | Bedminster | NJ | 07921 | 888-249-4980 | National | PS ALI | |
| ATTWS | A | AT&T Wireless Services, Inc. | E911 Chief Compliance Officer | PO Box 97061 | Redmond | WA | 98073-9761 | 800-635-6840 | ALL States | Wireless |
| ATU | OB | (Out of Business) ATU Telecommunications | 600 Telephone Avenue | Anchorage | AK | 99503-6091 | 907-564-1642 | Anchorage, Byrd, Indian, Girdwood, Portage, Hope, AK | Facility | |
| ATZ | C | (Cancelled) ATX Telecommunications Services | 50 Monument Rd. | Bala Cynwyd | PA | 19004 | 610-668-3000 | PA, NJ, DE | Reseller | |
| AVILA | A | AVILA | 100 White Pine Drive | Albany | NY | 12203-4494 | 800-829-0420 | NY | PBX/Facilt | |
| AVoIP | A | AT&T | One AT&T Way | Bedminster | NJ | 07921 | 888-249-4980 | ALL | VoIP | |
| AWC | A | All West Communications | 50 W. 100 N. PO Box 588 | Kamas | UT | 84036 | 435-783-4361 | UT, WY | Facility | |
| AWE | A | Awesome Communications, Inc. | 1202 D’antignac Street | Augusta | GA | 30901 | 877/231-2881 | GA, SC, LA | Reseller | |
| AX911 | C | (Cancelled) Columbia Telecommunications, Inc. | 1340 Poydras St., | Suite 340 | New Orleans | LA | 70112 | 985-655-7383 | LA | Facility & Reseller |
| AXXS | A | Axxis Communication, Inc. | 616 Industrial Ave. | Suite 401 | Hood River | OR | 97031 | 541-386-3723 | OR, WA | facility |
| AYB | A | Al-Call, Inc. | 101 Mercer Street | Alma | GA | 31510 | 912-632-5911 | GA | Facility | |
| AZSOA | I | (Inactive) State of Arizona ISD-ATS | 1510 W. Adams | Phoenix | AZ | 85007 | 800-542-HELP | AZ (portions of Phoenix and Tucson) | PBX | |
| BAM | C | (Cancelled) Bell Atlantic Mobile | 8921 Research Dr. | Charlotte | NC | 28262 | 908-306-7123 | South Central & Western NC; Wetern half of SC; North East co | Cellular | |
| BARE | A | Bare Escentuals, Inc. | 71 Stevenson | 22nd Floor | San Francisco | CA | 94105 | 415-489-5000 | CA | VoIP PBX |
| BART | A | S.F. Bay Area Rapid Transit | 800 Madison Street | PO Box 12688 | Oakland | CA | 94607 | 888-611-0029 | CA | Facility |
| BASD | A | Boyertown Area School District | 911 Montgomery Ave | Boyertown | PA | 19512 | 610-473-3500 | PA | PBX | |
| BATES | A | Bates College | 2 Andrews Road | Lewiston | ME | 04240 | 207-786-6254 | ME, Lewiston | PBX | |
| BAYLD | A | Bayland Communications, Inc. | 2710 US Highway 41 & 141 | Abrams | WI | 54101 | 920-826-7100 | Oconto County | Facility | |
| BAYRG | A | BayRing Communications | 359 Corporate Drive | Portsmouth | NH | 03801 | 603-766-1000 | NH, MA, ME | Facility | |
| BBEND | A | Big Bend Telephone | 808 North 5th Street | Alpine | TX | 79830 | 432-364-1000 | TX | Facility | |
| BBMTC | C | (Cancelled) Butler-Bremer Mutual Telephone Co. | PO Box 99 | 716 Main Street | Plainfield | IA | 50666 | IA | 319/276-4458 | Faciltiy |
| BBO | C | (Cancelled) BroadBand Office Inc. | PO Box 37 | Springfield | VA | 22150 | 888-746-4226 | AZ, CA,CO, DC, FL, GA, IL, IN, MA, MI, MN, MO, NC, NY, NJ, O | Facility, reseller | |
| BBURG | A | Brandenburg Telecom LLC | 220 Telco Drive | PO Box 599 | Brandenburg | KY | 40108 | 270/422-2121 | KY | Facility |
| BCI | C | (Cancelled) BroadSpan Communications, Inc. | 11756 Borman Dr. Suite 101 | St. Louis | MO | 63146-4133 | 800-901-7727 | MO | CLEC | |
| BCI01 | A | Blackfoot Communications | 1221 N Russell St | Missoula | MT | 59808 | 406-541-5000 | MT | CLEC | |
| BCO | C | (Cancelled) Backbone Communications, Inc. | 1801 Century Park East, Suite 1830 | Los Angeles | CA | 90067 | 800-987-1111 | CA, CO, FL, IL, MA, NY, TX, WA | Facility | |
| BCTC | A | Benton Cooperative Telephone Company | 2220 125th Street NW | Rice | MN | 56367-9701 | 320-393-4499 | MN | ILEC | |
| BDO | C | (Cancelled) BDO Seidman, LLP | 130 East Randolph | Chicago | IL | 60601 | 800-844-1001 | Chicago, IL | PBX | |
| BDVX | A | Broadvox | 1228 Euclid Avenue | Suite 390 | Cleveland | OH | 44115 | 216-373-9436 | Continental US | VoIP |
| BEE | A | Beehive Telephone Co. | 2000 E. Sunset Road | Lake Point | UT | 84074 | 435-837-6000 | UT, NV | Facility | |
| BEGGS | A | Beggs Telephone Company | 5th and Choctaw | Beggs | OK | 74421 | 918-267-9990 | Beggs, OK | Facility | |
| BEKIN | C | (Cancelled) The Bekin Company | 330 South Manheim Rd. | Hillside | IL | 60162 | 708-243-0801 | IL | IT/MIS | |
| BELAT | C | (Cancelled See VERIZ) Bell Atlantic | 125 High St | Oliver Tower 3rd Floor | Boston | MA | 02110 | |||
| BELIG | A | BellSouth Internet Group | 575 Morosgo Drive | 3E59 | Atlanta | GA | 30324 | 800-317-3343 | LA,MS,AL,GA,FL,SC,NC,TN,KY | ICP |
| BELSO | A | BellSouth | Room 25M64 | 675 West Peachtree Street, NW | Atlanta | GA | 30375-0002 | 800-553-2811 | AL, LA, MS, TN, KY, NC, SC, GA, FL | ILEC |
| BENDT | P | BendTel | 130 NE Greenwood Ave. | Bend | OR | 97701 | 541-385-5100 | OR | Facility | |
| BERKL | A | Berklee College of Music | MS-1140-NETT | 1140 Boylston Street | Boston | MA | 02215 | 781-953-1872 | MA | Facility |
| BEVCM | C | (Cancelled) BEVCOMM, Inc. | 123 W. 7th St. | Blue Earth | MN | 56013 | 507-526-5156 | MN | Reseller | |
| BEVTC | C | (Cancelled) BEVCOMM | 123 West Seventh Street | Blue Earth | MN | 56013 | 507-526-3252 | MN | Facility | |
| BF911 | C | (Cancelled – see MCI) Brooks Fiber | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75802 | 800-844-1001 | USA | Facility |
| BGC | A | Bluegrass Cellular, Inc | 2902 Ring Rd | Elizabethtown | KY | 42701 | 270-352-7000 | KY | Cellular | |
| BGE | I | (Inactive) Baltimore Gas & Electric | Mezzanine | 39 West Lexington Street | Baltimore | MD | 21201 | 410-597-7700 | MD; BGE company locations only | PBX |
| BGTC | A | Bluegrass Telephone Company | 722 West Main Street | Clarkson | KY | 42726 | 270-242-3600 | KY | Facility | |
| BHEC | A | Bangor Hydro-Electric Co. | 33 State St. | Bangor | ME | 04401 | 207-942-4416 | ME | PBX | |
| BHF | A | Prairiewave Black Hills | 806 Deadwood Ave. | PO Box 2115 | Rapid City | SD | 57709 | 877-243-4237 | SD | Facility |
| BHM | I | (Inactive) BrahmaCom, Inc. | 32 Wexford Street | Needham | MA | 02445 | 781/433-0333 | MA | Facility | |
| BIF | P | BinFone Telecom LLC | 3907 Pinkney Road | Baltimore | MD | 21215 | 800-998-5911 | ALL | VoIP | |
| BIJOU | A | Bijou Telephone Co-Op | 138 S. Main Street | PO Box 276 | Byers | CO | 80103 | 303/822-9300 | Byers & Deertrail, CO | LEC |
| BIRCH | A | Birch Telecom, Inc. | 2020 Baltimore Ave. , 1st Floor | Kansas City | MO | 64108 | 888/772-4724 | Facilities based and resale customers | Facility, resale | |
| BIT | A | Buggs Island Telephone Cooperative | PO Box 129 | Bracey | VA | 23919 | 434-636-2274 | VA | Telephone | |
| BIXBY | A | Bixby Telephone Co. | 6 E/ Breckenridge | Bixby | OK | 74008 | 918-366-8000 | Tulsa Co., OK | Telephone | |
| BKSCH | A | The Berkshire School | 245 North Undermountain Road | Sheffield | MA | 01257 | 412-229-1136 | MA | PBX | |
| BLC | A | Ben Lomand Communications, Inc. | 311 North Chancery Street | McMinnville | TN | 37110 | 931-668-1000 | TN Cities: McMinnville, Sparta | IXC, CLEC | |
| BLIND | A | Perkins School f/t Blind | 175 North Beacon Street, Business Office | Watertown | MA | 02472 | 617-972-7602 | MA | PBX | |
| BLKDK | A | Blackduck Telephone Company | 50 Margaret Ave. NE | PO Box 325 | Blackduck | MN | 56630 | 218/835-4941 | phone area codes 218, 835, 374 | LEC |
| BLKFT | I | (Inactive) Blackfoot Telephone | 1221 North Russell Street | Missoula | MT | 59808-1898 | 406-541-5000 | MT | ILEC | |
| BLO | A | Borderland Communications, LLC | PO Box 2066 | 845 Pyle Drive | Kingsford | MI | 49802 | 906-771-1000 | MI | Facility |
| BLSTM | A | Bluestem Telephone Co. | 558 Broadway | Americus | KS | 66835 | 620/443-5050 | KS | RLEC | |
| BLTC | A | Ben Lomand Telephone Cooperative, Inc. | 311 N. Chancery Street | McMinnville | TN | 37110 | 931-668-1000 | TN Counties: Warren, White, Van Buren, Grundy | ILEC | |
| BLUE | A | Blue Valley Tele-Communications, Inc. | 1557 Pony Express Highway | Home | KS | 66438 | 785-799-3311 | KS | ILEC | |
| BMTC | A | Brindlee Mountain Telephone Company | 113 South Main Street | Arab | AL | 35016 | 256-586-2682 | Arab, AL; Morgan City, AL; Union Grove | Facility | |
| BMWNA | C | (Cancelled) BMW North America, Inc. | 5650 Arcturus Road | Oxnard | CA | 93033 | 201-307-3771 | Oxnard, CA | PBX | |
| BNC | C | (Cancelled) BuzNet Communications | 5757 Alpha Road, Suite 107 | Dallas | TX | 75240 | 972-644-0440 | TX | Facility | |
| BNTC | A | Baldwin Nashville Telephone Company Inc | 5075 Hwy 64 | PO Box 50 | Baldwin | IA | 52207 | 563-673-6001 | IA | ILEC |
| BNTVL | C | (Cancelled) Bentleyville Telephone Co. | 608 Main St. | Bentleyville | PA | 15314 | 724-239-2501 | 724-239 Exchange in PA | LEC | |
| BOND | C | (Cancelled) Bond County ETSB | 200 W. College PO Box 128 | Greenville | IL | 62246 | 618-664-1911 | IL – Bond County | PSAP | |
| BORD | A | Border to Border Communications, Inc. | 718 Alpine Drive | Kerryville | TX | 78028 | 956-936-2000 | Rural Zapate County, TX | ILEC | |
| BPI | I | (Inactive) BasicPhone, Inc. | 2207 Macarthur Drive | Orange | TX | 77630 | 888-503-3663 | TX, LA, OK, AR, KS, NV, MS, MO, FL | Reseller | |
| BPOND | C | (Cancelled) Bryant Pond Telephone Company | P. O. Box 187 | Buckfield | ME | 04220 | 207-336-9911 | ME | ILEC | |
| BRC | A | Brethren Retirement Community | 750 Chestnut Street | Greenville | OH | 45331 | 937-547-8000 | OH | PBX | |
| BRG | A | Baraga Telephone Company | 204 State Street | Baraga | MI | 49908 | 906-334-2600 | MI | POTS | |
| BRGA | A | Baraga Telephone Company | 204 State St | Baraga | MI | 49908 | 906-334-2600 | MI | CLEC | |
| BRGN | A | Bergen Telephone Company | 105 Plain Street | Sharon | WI | 53585 | 262-736-9981 | IL | Facility | |
| BRIDG | A | Bridgecom International, Inc. | 500 Westchester Ave., 3rd Floor | Valhalia | NY | 10595 | 800-427-9114 | NY | Facility | |
| BRST | OB | (Out of Business) BroadStreet Communications, Inc. | 601 Technology Drive Suite 300 | Canonsburg | PA | 15317 | 877-638-2861 | PA, MD, DC, VA, SC, NC, FL, TN, AL, GA | Facility | |
| BRT | A | Big River Telephone Company, LLC | 24 S. Minnesota Ave. | Cape Girardeau | MO | 63702 | 800-455-1201 | MO | Facility | |
| BRTC | A | Ballard Rural Telephone Coop. Corp., Inc. | 159 West Second Street | PO BOX 209 | La Center | KY | 42056 | 270-665-5186 | KY | Facility |
| BRUCE | A | Bruce Telephone Company | 620 North Alvey Street | PO Box 100 | Bruce | WI | 54819 | 715-868-5111 | WI | Facility |
| BRVAL | A | Valley Telephone Co. | PO Box 277 | 100 Main Street | Underwood | MN | 56586 | 218-826-6161 | MN,SD | Facility |
| BRVR | A | BroadRiver Communications Company | 13000 Deerfield Parkway, Suite 210 | Alpharetta | GA | 30004 | 678-878-1778 | GA, FL, TN | Facility | |
| BRZO | A | Brazos Telecommunications, Inc. | 109 N. Avenue D | Olney | TX | 76374 | 940-564-5659 | Young County, Archer County TX | ||
| BRZS | A | Brazos Cellular Communications, Ltd. | 104 N. Ave. E | Olney | TX | 76374 | 940-564-3531 | TX | Facility | |
| BRZZ | A | Brazos Telephone Co-op., Inc. | 109 N. Avenue D | Olney | TX | 76374 | 940-564-5659 | Stephens County, Young County, Archer County, Jack County TX | ||
| BSCC | C | (Cancelled – See CING) BellSouth Cellular Corp. | 1100 Peachtree Street, N.E. | Atlanta | GA | 30309-4599 | FL, GA, AL, MS, LA, NC, SC, TX, CA, HI | Cellular | ||
| BSDCS | C | (Cancelled-See CING) Cingular Wireless DCS | 5600 Glenridge Dr. Suite G301 | Atlanta | GA | 30342 | 800-298-3551 | NC. SC, East TN, East Ga, Southwest VA | Wireless | |
| BSOCO | C | (Cancelled) Bell South Cellular One | 8888 Keystone Crossing, Ste. 300 | Indianapolis | IN | 46270 | 847-765-5300 | IN | Wireless | |
| BSVIP | A | BellSouth Long Distance, Inc. | 400 Perimeter Center Terrace | Suite 350 | Atlanta | GA | 30346 | 800-317-3343 | (TF Option 2, then 6) AL, FL, GA, KY, LA, MS, NC, SC, TN | Facility |
| BTC | A | Blossom Telephone Company | PO Box 8 | 145 N. Center | Blossom | TX | 76516 | 903-982-5200 | TX | Facility |
| BTC | OB | (Out of Business) BarTel Communications, Inc. | 333 Leffingwell Ave., Ste. 101 | P.O. Box 220932 | St. Louis | MO | 63122 | 888-490-0055 | KS | Local Rese |
| BTC01 | A | Brandenburg Telephone Company | 200 Telco Drive | PO Box 599 | Brandenburg | KY | 42701 | 270-422-2121 | Hardin County, Meade County, Breckinridge County KY | Facility |
| BTCC | A | Brantley Telephone Company, Inc. | 112 East Cleveland Street | PO Box 255 | Nahunta | GA | 31553 | 912-462-6845 | GA (SE) | Facility |
| BTCI | A | BTC, Inc. d/b/a Western Iowa Networks | 112 E Main Street | Breda | IA | 51436 | 712-673-2311 | IA | CLEC/Resel | |
| BTCOP | A | Bulloch Telephone Cooperative | 601 Northside Drive, West | Statesboro | GA | 30458 | 912/764-9926 | GA | Telephone | |
| BTCTN | A | Bledsoe Telephone Cooperative | 203 Cumberland Ave. | Pikeville | TN | 37367 | 423-447-2121 | TN | Facility | |
| BTEL | A | Brazoria Telephone Company | 214 W. Texas Street | PO Box 2008 | Brazoria | TX | 77422 | 979-798-5000 | TX | ILEC |
| BTI | I | (Inactive) Business Telecom Inc. | 4300 Six Forks Road | Raleigh | NC | 27609 | 800-849-2111 | USA | Facility | |
| BTS | A | Buckeye Telesystem Inc. | 5552 Southwycle Blvd. | Toledo | OH | 43615 | 419-724-9898 | OH | CLEC | |
| BUD | A | Budget Telephone | 6901 W. 70th Street | PO Box 19360 | Shreveport | LA | 71149 | 866-309-8634 | LA | Facility |
| BUF | A | Buffalo Lake Erie Wireless | 2318 Wehrle Drive | Williamsville | NY | 14221 | 716-961-2050 | NY; Erie, PA | PCS | |
| BULL | I | (Inactive) Bullseye Telecom, Inc. | 25900 Greenfield Road | Suite 330 | Oak Park | MI | 48237 | 248-784-2500 | AL, FL, GA, KY, MS, NC, SC, TN, CO, IA, MN, NE, OR, WA, CA, | Reseller |
| BURT | A | Burt Telephone Company | 214 Walnut Street | P.O. Box 127 | Burt | IA | 50522-0127 | 515-924-3224 | Kossuth County, IA | LEC |
| BURTL | A | Burlington Telecom | 250 Main Street | The Annex | Burlington | VT | 05401 | 802-865-7537 | VT | Facility |
| BVINC | P | BroadVoice Inc. | 9 Executive Park Drive | North Billerica | MA | 01862 | 978-418-7350 | Continental US | VoIP | |
| BVT | A | Baca Valley Telephone Company, Inc. | 532 Broadway | Des Moines | NM | 88418 | 505-278-2101 | NM | Facility | |
| BVTC | A | Buffalo Valley Telephone Company | 20 Second Street | Lewisburg | PA | 17837 | 888-316-4430 | PA | Facility | |
| BVUO | A | Bristol Virginia Utilities OptiNet | 15022 Lee Highway | Bristol | VA | 24202 | 276-591-3073 | VA | Facility | |
| BWCI | A | BitWise Communications, Inc. | 682 High Point Lane | East Peoria | IL | 61611 | 309-657-6365 | IL | Facility | |
| BWT | A | Baltimore-Washington Telephone | 312 Laurel Ave. | Laurel | MD | 20707 | 301-455-0170 | MD portion of Washington-Baltimore metropolitan area | Facility | |
| BWTEL | A | BWTelcom | 607 Chief St | PO Box 645 | Benkelman | NE | 69021-0645 | 308-423-2000 | NE | Telephone |
| BYTEC | A | Bay Springs Telephone Co., Inc. | 2988 Highway 15 | Bay Springs | MS | 39422 | 601-764-4762 | MS | ILEC | |
| C1AMA | A | Cellular One of Amarillo | 7203 I-40 W. Suite M | Amarillo | TX | 79106 | 806-680-0085 | TX | Cellular/PCS-Carrier | |
| CABLE | C | (Cancelled) Cable Plus Management Company, LP | 11400 S.E. 6th Street | Suite 120 | Bellevue | WA | 98004 | 800-659-1381 | TX, WA, OR, AZ, NV, GA | PBX/CLEC |
| CAFF | A | Insight Phone of Kentucky | 10200 Linn Station Road | Suite 100 | Louisville | KY | 40233 | 800-771-9124 | IN, KY | Facility |
| CALLT | A | CallTower, Inc. | 5 Thomas Mellon Circle | Suite 245 | San Francisco | CA | 94134 | 415-869-8996 | Lower 48 States | VoIP |
| CALOR | A | Cal-Ore Telephone Co. | 719 W. 3rd St. | Dorris | CA | 96023 | 530-397-2211 | Dorris, Macdoel, Newell, Tulelake, counties CA Klamath count | Facility | |
| CALTL | A | Calaveras Telephone Company | PO Box 37 | 513 Main Street | Copperopolis | CA | 95228 | 209-785-2211 | Copperopolos & Jenny Lind, CA | Facility |
| CAM | A | Cameron Telephone Company | 153 W Dave Dugas Road | Attn:Ginny LeBoeuf | Sulphur | LA | 70665 | 337-583-2111 | LA | LEC |
| CAMEL | A | Camellia Communications | P. O. Box 129 | 201 Greenville By-Pass, Suite 3 | Greenville | AL | 36037 | 334-371-3000 | Greenville and Ft. Deposit, AL | Facility |
| CAPRK | A | Cap Rock Telephone Co-op, Inc. | 121 E. Third Street | Spur | TX | 79370 | 806-271-3336 | TX | Facility | |
| CARLS | A | Carlsbad by the Sea | 2855 Carlsbad Blvd | Carlsbad | CA | 92008 | 800-829-1011 | All | PBX | |
| CARO | OB | (Out of Business) Carolina Phone | 400 Brookfield Parkway | Greenville | SC | 29607 | 864-599-7820 | SC | Wireless | |
| CARR | A | Carr Telephone Company | 4325 S. Masten Road | PO Box 100 | Branch | MI | 49402 | 231-898-4400 | MI | ILEC |
| CARTC | A | Carr Telephone Company | 4325 S. Masten Road | PO Box 100 | Branch | MI | 49402 | 231-898-4400 | MI | CLEC |
| CASS | A | Cass County Telephone | 260 W. First St. | PO Box 398 | Peculiar | MO | 64078 | 800-999-0836 | MO, KS | Facility |
| CASTL | A | Cass Telephone Company | 100 Redbud Road | PO Box 230 | Virginia | IL | 62691 | 888-637-8513 | IL | ILEC |
| CATEL | OB | (Out of Business) Cass Telephone Company | 100 Redbud Road | Virginia | IL | 62691 | 217-452-3028 | IL | LEC | |
| CAUNE | A | SBC California | 3707 Kings Way | Room C33 | Sacramento | CA | 95821 | 800-275-0014 | CA | UNE P |
| CAV | A | Cavalier Telephone, L.L.C. | 2134 W. Laburnum Ave. | Richmond | VA | 23227 | VA,DC,MD,DE,NJ,PA | Facility | ||
| CBC | A | Comcast Business Communications, Inc. | 650 Centerton Road | Moorestown | NJ | 08057 | 888-262-7300 | MD, PA, DE, NJ | CLEC | |
| CBKS | A | US Army War College | 650 Wright Ave | Carlisle | PA | 17013-5051 | 717-245-4115 | PA | PBX | |
| CBYND | A | Cbeyond Communications | 320 Interstate North Pkwy SE. Suite 300 | Atlanta | GA | 30339 | 678-424-2498 | GA | CLEC | |
| CCAS | A | Cross Country Automotive Services | 4040 Mystic Valley Parkway | Medford | MA | 02155 | 800/824-6678 | ALL | PBX | |
| CCC | A | Citizens Communications Corporation | 220 Webbs Mill Road | Floyd | VA | 24091 | 540-745-2115 | VA | CLEC | |
| CCG | A | Campus Communications Group, Inc. | PO Box 85 | Champaign | lL | 61824 | 877/468-3832 | FL, NC, TX, IL, MI, MN | PBX | |
| CCH | C | (Cancelled) The Chester County Hospital | 701 East Marshall Street | West Chester | PA | 19380 | 610-431-5000 | PA | PBX | |
| CCI | A | Cat Communications International, Inc. | 3435 Chip Drive NE | Roanoke | VA | 24012 | 540-444-2125 | MI | Facillity | |
| CCITX | A | Consolidated Communications – Texas | 121 South 17th Street | 2-3 | Mattoon | IL | 61938 | 800-879-2107 | IL, TX | ILEC |
| CCMTC | A | Clear Creek Telephone | 18238 S Fischers Mill Rd | Oregon City | OR | 97035 | 503-631-2345 | OR | Facility | |
| CCOLL | P | Central College | 812 University Street | Pella | IA | 50219 | 641-780-2847 | Pella, IA | PBX | |
| CCRTC | I | (Inactive) Clay County Rural Telephone Coop., Inc. | 2 South West Street | PO BOX 237 | Cloverdale | IN | 46120 | 765-795-6651 | IN (Putnam, Owen, Clay, Parke, Hamilton, Tipton, Hendricks, | Telecommun |
| CCSPT | C | (Cancelled) Campuslink-PaeTec | 1530 Eisenhower Place | Ann Arbor | MI | 48108 | 734-975-8000 | ALL | PBX | |
| CCT | C | (Cancelled) Coast to Coast Telecommunications | 24700 North Western Hwy, Ste. 400 | Southfield | MI | 48075 | 248-623-6700 | MI | CLEC | |
| CCTC | A | Coon Creek Telecommunications | 312 Locust St NE | Blairstown | IA | 52209 | 319-454-6234 | IA Cities: Belle Plaine, Marengo | CLEC | |
| CCTCI | A | Comanche County Telephone Co., Inc. | 6100 Highway 16 | PO Box 290 | DeLeon | TX | 76444 | 254-842-7040 | TX | Facility |
| CDL | A | Cellular One of East Central Illinois | 2 E Main St | 28 Towne Centre | Danville | IL | 61832 | 217-497-7282 | IL | Facility |
| CEDAR | A | Cedar Communications L.L.C. | 608 Lombard Street | PO Box 246 | Clarence | IA | 52216 | 563/452-4200 | IA | Facility |
| CEI | A | CEI Networks, Inc. | 202 East First Avenue | Birdsboro | PA | 19508 | 717-733-1411 | PA | Facility | |
| CELL1 | A | Cellular One | 7855 Walker Drive | Greenbelt | MD | 20770 | 800-773-7911 | MD, VA | PBX | |
| CELSO | A | Cellular South | 125 S. Congress Street | Suite 1000 | Jackson | MS | 39201-3303 | 601-941-2882 | MS | Wireless |
| CELXL | A | Cellular XL Associates, L.P. | 6184 US Hwy 98 West | Hattiesburg | MS | 39402 | 601-402-6876 | MS | Facility | |
| CENCL | A | Centennial Wireless | 1619 Magnavox Way | Fort Wayne | IN | 46804 | 219-750-3802 | IN, MI, OH, LA, MS, TX | Cellular | |
| CENPR | I | (Inactive) Centennial de Puerto Rico | Las Vistas Shopping Village | Las Cumbres Avenue, Suite 300 | San Juan | PR | 00926 | 787-717-9900 | PR, USVI | PCS, CLEC |
| CENSU | A | Census Bureau | 4700 Silver Hill Road | Room 1100 | Suitland | MD | 20233-1912 | 888-471-3495 | MD | VoIP |
| CEPBT | A | EPB Telecom | 536 Market Street | Chattanooga | TN | 37402 | 423-648-1500 | Cleveland, TN, Bradley County | Facility | |
| CFWAN | C | (Cancelled) CFW Cellular | 1160 Shenandoah Village Drive, PO Box 1527 | Waynesboro | VA | 22980 | 888-377-2845 | Rockingham, Augusta, Highland Counties in VA | Analog Cel | |
| CFWC | C | (Cancelled) NTELOS | 9011 Arboretum Parkway | Suite 295 | Richmond | VA | 23236 | 540-941-4800 | VA, WV, KY, NC, OH, PA | Facility |
| CFWDI | A | NTELOS | 9011 Arboretum Parkway | Suite 295 | Richmond | VA | 23236 | 540-943-6653 | VA, WV, KY, NC, OH, MD | Wireless |
| CGIC | A | Concord Group Insurance Companies | 4 Bouton Street | Concord | NH | 03301 | 603-224-4086 | NH | Facility | |
| CGMLU | A | Carnegie Mellon University | 5000 Forbes Ave. | Pittsburgh | PA | 15213 | 412-268-2323 | University | Centrex | |
| CGT | A | Columbus Grove Telephone | 112 West Sycamore Street | Columbus Grove | OH | 45830 | 419-659-2111 | OH | Facility | |
| CGTEC | A | Communigroup of Jackson | 700 South West Street | Jackson | MS | 39201 | 877/680-5172 | MS | Facility | |
| CHA | A | The Cambridge Health Alliance | 1493 Cambridge St. | Cambridge | MA | 02139 | 617-665-1000 | MA | PBX | |
| CHARV | A | Chariton Valley Telephone Corporation | 109 Butler Street | Macon | MO | 63552 | 660-695-9930 | MO | Facility | |
| CHASE | P | Chase Collegiate School | 565 Chase Parkway | Waterbury | CT | 06708-3394 | 203-236-9485 | CT | VoIP | |
| CHB | A | Children’s Hospital Boston | 300 Longwood Ave | Telecommunications, Main SB, Rm 0007 | Boston | MA | 02115 | 617-355-6000 | MA | PBX |
| CHC | A | Chickasaw Holding Company | 124 W. Vinita St. | Sulphur | OK | 73086 | 800-687-4402 | OK | ILEC, Facility | |
| CHCM | A | Chickamauga Telephone Corporation | 300 Thomas Ave. | Chickamauga | GA | 30707 | 706-375-3361 | Chickamaunga and High Point, GA | ILEC | |
| CHES | A | Chester Telephone Company | 112 York Street | Chester | SC | 29706 | 803-385-2191 | SC | Facility | |
| CHESA | A | City of Chesapeake | 300 Shea Drive | Chesapeake | VA | 23322 | 757-382-6339 | VA | PBX | |
| CHICK | A | Chickasaw Telephone Company | PO Box 460 | 124 W. Vinita | Sulphur | OK | 73086-0460 | 580/622-2100 | OK | Facility |
| CHILL | A | Horizon Chillicothe Telephone | 68 E.Main St. | Chillicothe | OH | 45601 | 800-457-4417 | Ross County | LEC | |
| CHINA | A | China Telephone Co. | 627 Route 3 | South China | ME | 04358 | 888-889-9950 | China, Vassalboro, South China | Facility | |
| CHLLC | I | (Inactive) Citynet Holdings, LLC | 601 W. Polk Street, Ste. 200 | Chicago | IL | 60607 | 312-427-9079 | IL IN,OH, TN, AZ, TX | CLEC | |
| CHMPL | A | Champlain Telephone Company | 1118 Rt. 9 Main Street | Champlain | NY | 12919 | 518-298-2418 | NY | Facility | |
| CHOAT | A | Choate Rosemary Hall | 333 Christian St. | Wallingford | CT | 06492 | 203-697-2400 | Choate Campus, Wallingford | PBX | |
| CHOP | A | Children’s Hospital of Philadelphia | Information Technology-Communications | 34th Street and Civic Ctr. Blvd. | Philadelphia | PA | 19104-4399 | 215-590-1000 | Philadelphia | PBX |
| CHTL | C | (Cancelled) Chesapeake Telecommunications Corp | 84 Main Street | Warsaw | VA | 22572 | 804-313-2257 | VA | Facility | |
| CHTR | A | Charter Fiberlink,LLC | 12405 Powerscourt Dr, 2nd Floor | St. Louis | MO | 63131-3674 | 314-543-5782 | MO, WI | Facility | |
| CHW | A | Christopher Heights of Webster | 338 Thompson Road | Webster | MA | 01570 | 508-397-0400 | Webster, MA | Facility | |
| CICLL | A | Creative Interconnect Communications LLC | 555 Old County Rd | Suite 100 | San Carlos | CA | 94070 | 650/595-5555 | CA | Reseller, UNE-P, Switched services |
| CICOM | A | C-I Communications, Inc. | ST HWY 6 40040 | Emily | MN | 56447 | 218-763-3000 | MN | Facility | |
| CIMCO | A | Cimco Communications | 1901 S. Meyers Rd. | Suite 700 | Oakbrook Terrace | IL | 60181 | 800-922-4626 | IL | Facility |
| CIMRN | A | Cimarron Telephone Company | 101 Cimarron Street | PO Box 160 | Mannford | OK | 74044 | 918-865-3311 | OK | Facility |
| CINBT | A | Cincinnati Bell Telephone | 201 East 4th St. PO Box 2301 | Cincinnati | OH | 45201 | 513-421-4911 | Kentucky, Ohio, Indiana | ALL | |
| CING | A | Cingular Wireless | Chief 911 Compliance Officer | PO Box 97061 | Redmond | WA | 98073 | 800-635-6840 | ALL | Wireless |
| CITG | A | Citizens Telephone | 134 N. Bailey Avenue | PO Box 187 | Leslie | GA | 31764 | 229-874-9000 | GA | Facility |
| CITHM | A | Citizens Telephone Company of Hammond, NY, Inc | 26 South Main St | PO Box 217 | Hammond | NY | 13646 | 315-324-5911 | Hammond, NY, Macomb, NYSt Lawrence CountyJefferson Count | Facility |
| CITTC | A | Citizens Telephone Cooperative, Inc. | 143 E Main Street | New Auburn | WI | 54757 | 715-237-2605 | WI | ILEC | |
| CITVA | A | Citizens Telephone Cooperative | 220 Webbs Mill Rd N | Floyd | VA | 24091 | 540-745-2115 | VA | Facility | |
| CITZN | C | (Cancelled) Citizens Telephone Co. of Kecksburg | SR 0982 Box 156 | Mammoth | PA | 15664-0156 | 800-710-5500 | Unity Twp, Mt. Pleasant Twp., PA | ILEC | |
| CLEC | C | (Cancelled) Reserve Telecommunications Co. | 203 West 4th Street | Reserve | LA | 70084 | 985-536-3635 | LA | Facility | |
| CLI | C | (Cancelled) Cablevision Lightpath, Inc. | 111 New South Rd. | Hicksville | NY | 11801 | 516-393-3434 | NY, CT | Facilities | |
| CLNC | A | Clarence Telephone Company, Inc. | 608 Lombard Street | PO Box 246 | Clarence | IA | 52216 | 563/452-3852 | IA | Faciltiy |
| CLRTK | C | (Cancelled) Cleartalk | 1600 Ute Avenue, Ste. 10 | Grand Junction | CA | 81501 | 970/234-9996 | CO | Facility | |
| CLTEL | A | Clear Lake Independent Telephone Company | 107 N. 4th Street | PO Box 66 | Clear Lake | IA | 50428 | 641-357-2111 | IA | Teleco |
| CMAV | OB | (Out of Business) ComAv Corporation | 586 Commercial Ave. Suite 200 | Garden City | NY | 11530 | 888-452-6628 | NY, MA, ME, RI, NH, VT, NJ, PA | Facility | |
| CMC | A | CMC Telecom | 50481 W. Pontiac Trail | Wixcom | MI | 48393 | 248-668-2800 | MI | Facility | |
| CMCS | A | Cyber Mesa Computer Systems | 1830 Fifth Street | Santa Fe | NM | 87505 | 505-988-9200 | NM | Facility | |
| CMCST | A | ComCast Phone | 5800 S. Quebec Street, Ste. 300 | Greenwood Village | CO | 80111 | 800-839-6707 | NH, MA, CT, PA, VA, GA, FL, IL, MI, MN, TX, CO, WA, OR, CA, | Facility | |
| CMNT | A | Commnet Wireless, Inc. | 16 West 127 83rd Street | Burr Ridge | IL | 60527 | 630/986-9898 | FL, CO, AZ, CA, NM, WY, MT, ND, SD, KS, MO, TX | Wireless | |
| CMPLS | A | Communications Plus Inc | 1449 Fairmont Rd | Morgantown | WV | 26501 | 304-983-2211 | WV | Facility | |
| CMS | I | (Inactive) Cellular Mobile Systems of St. Cloud | 126 Division Street | Waite Park | MN | 56387 | 320-292-8450 | MN, Counties Stearns, Sherburn, Benton | Wireless | |
| CMSCP | A | ComScape Telecommunications, Inc. | 1926 10th Ave. North, Suite 305 | West Palm Beach | FL | 33461 | 561-540-4760 | WV, NC | Facility | |
| CMTL | C | (Cancelled) Community Telephone Co Inc | 10183 State Highway 25 E | Windthorst | TX | 76389 | 940-423-6201 | TX | ILEC | |
| CMWVZ | I | (Inactive) Midwest Communications dba ComWavz | 4110 Monroe Street | Toledo | OH | 43606 | 419-367-8440 | OH | Facility | |
| CNB | A | City of Newport Beach | 3300 Newport Blvd. | Newport Beach | CA | 92660 | 877-340-2600 | CA | PBX | |
| CNC | A | Cal-North Cellular | 11918 Main Street | PO Box 627 | Fort Jones | CA | 96032-0627 | 800/499-1863 | California | Facility |
| CNCLS | A | Chorus Networks, Inc. | PO Box 5158 | Madison | WI | 53705 | 608-831-5858 | WI | CLEC, Reseller | |
| CNCTV | C | (Cancelled) Conectiv Communications | 252 Chapman Rd. PO Box 6066 | Newark | DE | 19714 | 888-662-5700 | DE, PA, MD, NJ | Facility | |
| CNI | C | (Cancelled) Broadview Networks, Inc | 45-18 Court Sq. Suite 403 | Long Island City | NY | 11101 | xxx-xxx-xxxx | NY | Facility | |
| CNR | A | The College of New Rochelle | 29 Castle Place | New Rochelle | NY | 10805 | 800-337-8824 | NY | PBX | |
| CNS | C | (Cancelled) Ciera Network Systems, Inc. | 2630 Fountainview, Suite 300 | Houston | TX | 77057 | 888-467-1844 | TX | Reseller | |
| COB | A | City of Bedford | 215 East Main Street | Bedford | VA | 24523 | 540-875-7526 | Bedford, VA | PBX | |
| COBBO | C | (Cancelled) Cobbosseecontee Telephone | 250 Collins Mills Road | West Gardiner | ME | 04345-3410 | 207-724-9911 | ME | Facility | |
| COHMD | P | City of Hope Medical Center | 1500 E Duarte Road | Duarte | CA | 91010 | 626-301-8355 | CA | PBX/PS911/Shared Tenant | |
| COI | A | Communication Options, Inc. | 206 E. Market Street | Lima | OH | 45801 | 800/333-9967 | OH | Facility | |
| COLTN | A | Colton Telephone Company | PO Box 68 | 20983 S Hwy 211 | Colton | OR | 97017 | 503-824-3211 | OR | Facility |
| COMCH | C | (Cancelled – see OIA) CommChoice | 801 River Drive #150 | North Sioux City | SD | 57049-3128 | 712-422-1200 | Western IA, Eastern SD, Eastern NE | Facility | |
| COMM | A | Communications 1 Network, Inc. | 105 S. Main Street | PO Box 20 | Kanawha | IA | 50447-0020 | 641-762-3772 | IA | Facility |
| COMMS | I | (Inactive) Comm South Companies, Inc. | 6830 Walling Lane | Dallas | TX | 75231 | 800/936-5223 | All | Reseller | |
| COMNT | C | (Cancelled – see CMNT) Commnet Wireless Inc. | 16 W. 127 83rd St. | Burr Ridge | IL | 60527 | 630-986-9898 | FL, CO, AZ, CA, NM, WY, MT, ND, SD, KS, MO, TX | Wireless | |
| COMSN | A | ComSouth Telnet, Inc. | 910 Carroll Street | PO Box 910 | Perry | GA | 31069 | 478-892-9230 | GA | Facility |
| COMSP | A | Wantel Inc. dba Comspan USA | 1016 SE Oak Ave. | Roseburg | OR | 97470 | 541-229-0229 | OR | Facility | |
| COMST | A | ComSouth Telecommunications, Inc. | 250 Broad Street | PO Box 1298 | Hawkinsville | GA | 31036 | 478-892-9230 | GA | Facility |
| CON | A | Consolidated Companies | 6900 Van Dorn St, Suite 21 | Lincoln | NE | 68506 | 800-742-7464 | NE | LEC | |
| CONNC | C | (Cancelled) Connect.com | 124 W. Capitol, Suite 250 | Little Rock | AR | 72201 | 501-210-7624 | Arkansas | Facility & Reseller | |
| CONRT | A | CONAIR | 205 Shelhouse Dr | Rantoul | IL | 61866 | 217-892-8400 | IL | PBX | |
| CONSO | A | Consolidated | 507 South Main | Dickinson | ND | 58601 | 701-483-4000 | ND | Facility | |
| COON | A | Coon Valley Farmers Telephone Co | 105 Central Ave. | Coon Valley | WI | 54623-0398 | 608-452-3101 | WI | Facility | |
| COONC | A | Coon Creek Telephone Company | 312 Locust St. NE | Po Box 150 | Blairstown | IA | 52209-0150 | 319/454-6234 | Blairstown, IA | ILEC |
| COOPI | A | Cooperative Telephone Company | 704 3rd Street | PO Box H | Victor | IA | 52347 | 319-647-3030 | Hartwick, Guernsey, Ladora, and Victor IA | LEC |
| COR | A | City of Rockville | Information & Technology | 111 Maryland Avenue | Rockville | MD | 20850 | 301/340-7300 | Rockville, MD | Faciltiy |
| CORAL | A | Coral Wireless, LLC | Seven Waterfront Plaza | 500 Ala Moana Blvd., Suite 230 | Honolulu | HI | 96813 | 760-519-7453 | Oahu, HI | Wireless |
| CORE | C | (Cancelled) CoreComm | 15166 Neo Parkway | Garfield Heights | OH | 44128 | 877-267-3862 | OH, IL, MI, WI | Reseller | |
| CORR | A | Corr Wireless Communications, L.L.C. | 600 3rd Ave East | Oneonta | AL | 35121 | 205-625-7600 | AL | CMRS | |
| COSRV | C | (Cancelled) Advantex Communications | 7701 South Stemmons Freeway, Suite 210 | Corinth | TX | 76210 | 800-236-1076 | TX | Facility | |
| COT | A | City of Thomasville | 341 Fletcher Street | Thomasville | GA | 31792 | 229-227-5499 | GA | Facility | |
| COTAL | A | City of Tallahassee | 300 South Adams Street | Tallahassee | FL | 32301 | 850-891-8698 | FL | PBX | |
| COWB | C | (Cancelled) Cellular One Washington/Baltimore | 7150 Standard Drive | Hanover | MD | 21076 | 410-712-7725 | MD, VA, DC, WV | Carrier | |
| COWMA | C | (Cancelled) City of Waltham, Mass. | 161 Lexington Street – E-911 Dispatch Center | Waltham | MA | 02451 | 800-835-7656 | MA | PBX | |
| COX | A | Cox Communications, Inc. | 5775 Peachtree Dunwoody Pavilion | Building D, 2nd Floor | Atlanta | GA | 30342 | 888-326-9266 | USA | CLEC |
| CPLL | A | CommPartners, LLC | 3291 N. Buffalo Drive | Suite 8 | Las Vegas | NV | 89129 | |||
| CPLLC | C | (Cancelled) Chateau Pacific | 3333 148th Street | SW | Lynnwood | WA | 98037 | 866-463-6225 | WA | CLEC |
| CPRK | C | (Cancelled – see MCLDU) McLeodUSA, Inc | 6400 C Street SW | PO Box 3177 | Cedar Rapids | IA | 52406 | 800-332-2385 | TX, LA, AR, OK, NM, AZ | Facility |
| CPTCM | A | Computer Pro | 209 West 1st Street | Main Floor | Duluth | MN | 55802 | 866-285-6622 | MN | Facility |
| CPTCO | A | Crown Point Telephone Corp. | Main Street | 9N&22 | Crown Point | NY | 12928 | 518-597-3300 | Crown Point Exchange | LEC |
| CPTEL | A | Campti Pleasant Hill Telephone Co. | 8350 Stoddard St | Pleasant Hill | LA | 71065 | 318-796-3355 | LA | ILEC | |
| CPTNS | A | CP-Tel Network Services | 5909 Hwy 1 Bypass | Natchitoches | LA | 71457 | 318/352-0006 | Louisiana | Facility | |
| CPV | A | Cooperative Communications, Inc. | 412-420 Washington Ave. | Belleville | NJ | 07109 | 800-833-2700 | NJ | CLEC | |
| CRANE | A | Crane & Co., Inc. | 30 South Street | Dalton | MA | 01226 | 413-684-6346 | MA | PBX | |
| CRCCA | C | (Cancelled) CRC Communications of California | 4918 Taylor Court | Turlock | CA | 95382 | 800-241-9840 | CA | Facility | |
| CRCEL | A | Caprock Cellular, L.P. | 121 E. Third Street | Spur | TX | 79370 | 806-271-3336 | TX | Cellular | |
| CROCK | A | Crocker Telecommunications | 101 Munson Street | Greenfield | MA | 01302 | 413-387-1911 | MA | Facility | |
| CROS | A | Cross Telephone Company | 704 3rd Ave | Warner | OK | 74469 | 918-463-2921 | OK | Facility | |
| CROSS | A | Crosslake Communications | 35910 County Road 66 | Crosslake | MN | 56442 | 218-692-2777 | Crosslake, MN | Facility | |
| CRTEL | A | C-R Telephone Company | 106 N. 6th St. | P.O. Box 339 | Cornwell | KS | 61319 | 815-358-2295 | IL | RLEC |
| CSC | A | Conestoga Telephone and Telegraph Co. | 202 East First St. | Birdsboro | PA | 19508 | 888-316-4430 | PA | Facility | |
| CSCNJ | C | (Cancelled) Computer Sciences Corporation | 3170 Fairview Park Drive | Mail Code 500 | Falls Church | VA | 22042 | 469-995-2999 | NJ | PBX |
| CSCVT | C | (Cancelled) Castleton State College | Woodruff Hall | 62 Alumni Drive | Castleton | VT | 05735-9987 | 802/468-5611 | VT | PBX |
| CSDU | A | Cascade Utilities, Inc | 303 S Zobrist | Estacada | OR | 97023 | 503-630-4202 | OR | Facility | |
| CSIMN | A | Contel Sysems, Inc. | 1102 Madison Street | Breinerd | MN | 56401 | 218-764-5211 | MN | Facility | |
| CSISD | A | College Station ISD | 1812 Welsh | College Station | TX | 77840 | 979/764-5442 | College Station, TX | PBX | |
| CST | I | (Inactive) Community Service Telephone Company | 33 Main Street | Winthrop | ME | 04364-0400 | 207-377-9931 | ME | ILEC | |
| CSTC | A | Central Scott Telephone Company | 125 N 2nd St | PO Box 260 | Eldridge | IA | 52748 | 563-285-9611 | IA | Facility |
| CSTEL | P | Corner Stone Telephone Company | 2 Third Street | Suite 303 | Troy | NY | 12180 | 518-272-1018 | NY | Facility |
| CSTI | A | CS Technologies, Inc. | 125 N. 2nd St. | Eldridge | IA | 52748 | 563-285-4846 | IA | Facility | |
| CSU | A | Connecticut State University | 39 Woodland Street | Hartford | CT | 06105-2337 | 860-279-9450 | CT | PBX | |
| CSUCO | P | CSU Office of the Chancellor | 4665 Lampson Ave. | Los Alamitos | CA | 90720 | 800-275-0014 | CA | PBX | |
| CSYGC | A | Central Soya Company, Inc. | 124 S. Rte 47 | Gibson City | IL | 60936 | 217-784-8710 | IL | PBX | |
| CTALC | A | CenturyTel Acquisition, LLC | 100 Centurytel Drive | Monroe | LA | 71203 | 800-850-9048 | AL, IN, KS, LA, MS, MN, OH, TN, TX, WI | Facility | |
| CTC | I | (Inactive) Concord Telephone Company, Inc. | 68 Cabarrus Ave., East | Concord | NC | 28026-0227 | 704-722-2995 | Regional (Cabarrus, Stanley, and Rowan Counties in NC) | ILEC | |
| CTC01 | A | Cambridge Telephone Company | 613 Patterson St | PO Box G | Cambridge | NE | 69022 | 800-793-2788 | NE | ILEC |
| CTCA | C | (Cancelled) Clarksview Telephone Company | PO Box 55 | 716 Main Street | Plainfield | IA | 50666 | 319/276-4458 | IA | Faciltiy |
| CTCG | C | (Cancelled) CTC Communications | 220 Bear Hill Road | Waltham | MA | 02451 | 800-883-6900 | MA, ME, NH, CT, NY, NJ, DC, VA, PA, MD, RI, VT | Facility | |
| CTCGC | A | Coalfields Telephone Company | PO BOX 160 | 20 Laynesville Road | Harold | KY | 41635 | 606-478-2500 | Ky Exchanges 606-478, 606-452, 606-587 | Facility |
| CTCI | A | Custer Telephone Co-op, Inc. | 1111 South Main Street | Challis | ID | 83226 | 208-879-2290 | ID-Custer and Lemhi County | ILEC | |
| CTCIA | C | (Cancelled) Clarksview Telephone Company | PO Box 55 | 716 Main Street | Plainfield | IA | 50666 | 319/276-4458 | IA | Faciltity |
| CTCID | A | CTC Telecom, Inc. | 130 N. Superior St. | PO Box 69 | Cambridge | ID | 83610 | 208-257-3314 | ID | Facility |
| CTCMN | A | Consolidated Telephone Company | 1102 Madison St. | Brainerd | MN | 56401 | 218-764-3600 | MN | LEC | |
| CTCNF | A | CT Communications Network Inc. | 126 Scioto St | Urbana | OH | 43078 | 937-651-4001 | OH | Facility | |
| CTCO | A | Commonwealth Telephone Company | 100 CTE Drive | Dallas | PA | 18612-9774 | 570-631-5435 | PA | Facility | |
| CTEL | A | Cassadaga Telephone Company | 24 South Main Street | Cassadaga | NY | 14718 | 716-673-3011 | NY | ILEC | |
| CTELW | C | (Cancelled) Century Tel Wireless Inc. | 3505 Summerhill Road Suite #4 | Texarkana | TX | 75503 | 318-362-1777 | LA, MS, TX, AR, WI, MI | Wireless | |
| CTES | I | (Inactive) CTC Exchanges Services, Inc. | 68 Cabarrus Ave., East | Concord | NC | 28026-0227 | 704-722-2999 | NC | CLEC | |
| CTGR | A | Confederated Tribes of Grand Ronde | 9615 Grand Ronde Road | IS Department | Grand Ronde | OR | 97347 | 503/879-2183 | Grand Ronde Tribal Offices in Grand Ronde, OR | PBX |
| CTL | A | CenturyTel | 100 CenturyTel Drive 5N | Monroe | LA | 71203 | 800/824-2877 | AL, WI, IA, MI | LEC | |
| CTLAR | C | (Cancelled See CTL) CenturyTel of Arkansas, Inc | 100 Centurytel | Monroe | LA | 71203 | 800-824-2877 | AR | LEC | |
| CTLCO | C | (Cancelled See CTL) Centurytel of Colorado, Inc. | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | CO, NM, AZ | Facility | |
| CTLIA | C | (Cancelled See CTL) CenturyTel | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | IA | Facility | |
| CTLIN | C | (Cancelled See CTL) CenturyTel | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | IN | LEC/ALL | |
| CTLLA | C | (Cancelled See CTL) Century Telephone Enterprises | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | LA | Local | |
| CTLMI | C | (Cancelled See CTL) CenturyTel | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | MI | LEC/ALL | |
| CTLMN | C | (Cancelled See CTL) CenturyTel | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | MN | LEC/ALL | |
| CTLMO | C | (Cancelled See CTL) CenturyTel of Missouri, Inc | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | MO | Facility | |
| CTLMT | C | (Cancelled See CTL) Centurytel of Montana, Inc. | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | MT, ID, NV, WY | Dial tone and features | |
| CTLOH | C | (Cancelled See CTL) CenturyTel of Ohio Inc. | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | Lorain County Ohio | Facility | |
| CTLOR | C | (Cancelled See CTL) Centurytel of Oregon, Inc. | 100 CenturyTel | Monroe | LA | 71203 | 800/824-2877 | OR | Facility | |
| CTLSO | A | CenturyTel Solutions | 100 Century Park Dr | Monroe | LA | 71203 | 318-629-9000 | LA, MI, WI | Facility, CLEC | |
| CTLTX | C | (Cancelled See CTL) CenturyTel of Texas | 100 CenturyTel | Monroe | LA | 71203 | 800-824-2877 | TX | LEC | |
| CTLWA | C | (Cancelled See CTL) Centurytel of Washington, Inc. | 100 CenturyTel | Monroe | LA | 71203 | 800/824-2877 | WA | Facility | |
| CTLWI | C | (Cancelled See CTL) CenturyTel | 333 North Front St | La Crosse | WI | 54602-4800 | 800-824-2877 | WI | Facility | |
| CTS | A | Climax Telephone Co. | 110 N. Main St. | Climax | MI | 49034 | 616-746-4411 | Counties Kalamazoo & Calhoun | Facility | |
| CTSI | A | Commonwealth Telecom Services, Inc. | 100 CTE Drive | Dallas | PA | 18612 | 888-889-2309 | PA | Facility | |
| CTSL | A | Convergent Telesis LLC | 39 Windmill Lane | Southampton | NY | 11968 | 631-287-6649 | NY | Facility | |
| CTT | C | (Cancelled) Central Texas Technologies, L. P. | 13453 Highway 71 West | Bee Caves | TX | 78738 | 800-248-1487 | TX | Facility | |
| CTTC | A | Central Texas Telephone Coop. | 1012 Reilly Street | Goldthwiaite | TX | 76844 | 800-535-8904 | Central Texas | Telephone | |
| CTTEC | A | Crockett Telephone Co., Inc. | 1309 Louisville Avenue | Monroe | LA | 71201 | 901-742-2900 | TN | ILEC | |
| CTX | A | Cameron Telephone Company – Texas | PO Box 167 | Sulphur | LA | 70664 | 800-737-3900 | TX | ILEC | |
| CTYNT | I | (Inactive) Citynet Arizona, LLC | 1402 East Buckeye Road | Suite 100 | Phoenix | AZ | 85034 | 602-741-6916 | AZ | Facility |
| CTZN | A | Citizens Telephone Company if Higginsville, MO | 1905 Walnut Street | PO Box 737 | Higginsville | MO | 64037 | 660-584-7171 | MO | ILEC |
| CUMB | A | Cumberland County | 1 Courthouse Square | Carlisle | PA | 17013 | 717-240-7839 | Cumberland County Government PBX System | PBX | |
| CUMBT | A | Cumberland Telephone Company | 121 Main Street | P.O. Box 20 | Cumberland | IA | 50843 | 712-774-2221 | IA | LEC |
| CUMBY | A | Cumby Telephone Cooperative, Inc. | PO Box 619 | 200 Frisco | Cumby | TX | 75432 | 903-994-2211 | TX: Hunt and Hopkins County | ILEC/CLEC |
| CUMCL | A | Cumby Telephone Cooperative, Inc. | PO Box 619 | 200 Frisco Street | Cumby | TX | 75433 | 903-994-2211 | TX | CLEC |
| CUNN | A | Cunningham Telephone Co., Inc. | 220 West Main Street | PO Box 108 | Glen Elder | KS | 67446-0108 | 785-545-3215 | KS | Telecom |
| CURA | P | Curatel | 1605 W Olympic Blvd | Suite 701 | Los Angeles | CA | 90015 | 866-500-5674 | CA | CLEC Facility |
| CVAYV | I | (Inactive) A.C.N. Communication Services, Inc. | 32991 Hamilton Ct. | Farmington Hills | MI | 48334 | 888-226-9013 | AR, CA, CT, IL, IN, KS, MI, MO, NV, OH, OK, TX, WI | ULEC | |
| CVWS | A | Chariton Valley Wireless Service | 109 Butler | Macon | MO | 63552 | 660-695-9930 | MO | Wireless | |
| CWAVE | A | Clearwave Communications | 404 Seright St. | Harrisburg | IL | 62946 | 618-294-9800 | IL | Facility | |
| CWC | A | Immix Wireless | 2777-A Paper Mill Road | Wyomissing | PA | 19610 | 877/856-2802 | PA | PCS | |
| CWCI | A | Central Wisconsin Communications, Inc. | 440 E. Grand Avenue | PO Box 8045 | Wisconsin Rapids | WI | 54495-8045 | 715-652-3175 | WI | CLEC |
| CWT | A | Chazy & Westport Telephone Corp | 17 N Main Street | Westport | NY | 12993-0493 | 518-962-8211 | NY | Facility | |
| CWWNC | A | Carolina West Wireless | 1307 Curtis Bridge Road | Wilkesboro | NC | 28697 | 336-957-0896 | NC Counties: Avery, Ashe, Watauga, Wilkes, Alleghany, Surry | Facility | |
| CXP | OB | (Out of Business) Cable X-Perts | 416 Diens Drive | Wheeling | IL | 60090 | 800-828-3340 | Contentital US | Cables | |
| CYPRS | C | (Cancelled) Cypress Communications Operating Co. | 15 Piedmont Center, Ste. 100 | Atlanta | GA | 30305 | 888-528-1788 | All States | UNE-P | |
| CYTEL | OB | (Out of Business) CYTEL – Cypress Telecommunications | 11811 North Freeway, Suite 800 | Houston | TX | 77060 | 800-324-6123 | USA | Facility | |
| CZNE | A | Frontier, A Citizens Communications Co | 137 Harrison St. | Gloversville | NY | 12078-4815 | 800-779-0570 | NY, PA, WV, TN,NE,MN,IL,WI,SD,IA,KS | ILEC | |
| CZNW | A | Frontier, A Citizens Communications Co | 137 Harrison St. | Gloversville | NY | 12078-4815 | 800-921-8104 | AZ, CA, ID, MT, NM, NV, OR, UT,ND,MN | ILEC | |
| CZNX | C | (Cancelled) Citizens Telecommunications Company | 137 Harrison St | Johnstown | NY | 12095 | 800-921-8104 | CA | CLEC | |
| D&ESI | A | D & E Systems, Inc. | 124 East Main St. | Ephrata | PA | 17522 | 888-316-4430 | PA | Facility | |
| D&ETC | A | Denver and Ephrata Telephone and Telegraph Co. | 130 East Main St. PO .Box 458 | Ephrata | PA | 17522-0458 | 888-316-4430 | PA | Facility | |
| D1SD | C | (Cancelled) Denton ISD | 1212 N. Elm St. | Denton | TX | 76201 | 940-369-0119 | Denton, TX | PBX | |
| DAKTE | A | Dakota Central | 630 5th Street North | PO Box 299 | Carrington | ND | 58421 | 701/652-3184 | ND | Facility |
| DASH | A | Dash911 | 639 East 18th Street | Suite 110 | Denver | CO | 80203 | 888-835-8647 | USA | Reseller |
| DAY | A | Daytona Telephone Company | 315 N. Segrave | Daytona Beach | FL | 32114 | 800-637-1945 | FL | Facility | |
| DBSN | A | Dobson Telephone Company | 200 South LL Males Avenue | Commercial Office | Cheyenne | OK | 73628 | 580-497-3344 | OK | Facility |
| DCI | A | Hancock Communications, Inc. | 2043 E. 600 North, PO Box 4 | Maxwell | IN | 46154 | 317-326-8111 | IN | Facility, Reseller, PBX | |
| DCT | A | Digital Cellular of Texas | PO Box 1340 | 11.5 mi N. of Tahoka; Hwy 87 | Tahoka | TX | 79373 | 806-759-7624 | Lynn, Dawson, Gaines, Borden, Andrews, Martin Counties, TX | Wireless |
| DECAT | P | Decatur Telephone Co | 149 7th St | Decatur | MS | 39327 | 601-635-2251 | MS | Digital Cable PBX/PS911/Shared Tenant | |
| DEL | C | (Cancelled) Delavan Telephone Company | 105 2nd St E | Delavan | MN | 56023-0128 | 507-854-3221 | Independent Emergency Services | Facility | |
| DELCA | A | Delcambre Telephone Co. Inc. | 104 N. Corner St. | Delcambre | LA | 70528 | 337-685-2342 | Delcambre,LA | ILEC | |
| DELHI | A | Delhi Telephone Company | 107 Main Street | P.O. Box 271 | Delhi | NY | 13753 | 607-746-2119 | Portion of Delaware County, NY | Facility |
| DELTA | A | Delta Telephone Co., Inc. | 1314 Main Street | Louise | MS | 39097 | 662-836-5777 | MS | Facility | |
| DENCO | A | Denton County | 401 W. Hickory St. | Suite 637 | Denton | TX | 76201-9026 | 940-349-3002 | TX: County of Denton | PBX |
| DESI | C | (Cancelled – see D&ESI) D&E Systems Inc. | 124 E. Main Street | P.O. Box 458 | Ephrata | PA | 17522-0458 | 717-733-1411 | PA | Facility |
| DFT | A | DFT Local Service Corporation | 40 Temple Street | PO Box 209 | Fredonia | NY | 14063-0209 | 716-673-3011 | NY | Facility |
| DFTC | A | Deerfield Farmers Telephone Company | 4200 Teal Road | Petersburg | MI | 49270 | 734-279-1339 | MI | Facility | |
| DFTEL | A | Dunkirk & Fredonia Telephone Company | 40 Temple St. | PO Box 209 | Fredonia | NY | 4063-0209 | 716-673-3011 | NY | ILEC |
| DGW | A | Digital Connections, Inc. | PO Box 270 | 218 High Street | Morgantown | WV | 26507 | 888-303-6190 | WV | Facility |
| DIAL | C | (Cancelled) Dialink Corporation | 164 E. Dana St. | Mountain View | CA | 94041 | 650-691-9330 | CA | PBX, CLEC | |
| DIGA | A | Digital Agent | 1000 Circle 75 Parkway, Ste. 100 | Atlanta | GA | 30339 | 678/444-3007 | GA | Facility | |
| DIGEO | I | (Inactive) Digeo | 8815 122 Ave NE | Kirkland | WA | 98033 | 800-829-0420 | WA, CA, CO | PBX | |
| DIGPH | C | (Cancelled) DigiPh PCS, Inc. | 851 South Bellline Hwy., Suite 804 | Mobile | AL | 36608 | 334-694-1030 | AL, FL, MS | Wireless | |
| DIREC | C | (Cancelled) Direct Telephone Company, Inc. | 6300 Richmond | Houston | TX | 77057 | 713-627-9241 | TX | UNE-P | |
| DISC | A | Discovery Communications, Inc. | 1 Discovery Place | Silver Spring | MD | 20910 | 240-662-7562 | MD | PBX | |
| DIXTE | A | Dixville Telephone Co. | 6000 Cold Spring Rd. | Dixville Notch | NH | 03576 | 603-255-9919 | NH | Facility | |
| DIY | C | (Cancelled) Daniel Island Media Company | 1350 Daniel Island Dr. | Charleston | SC | 29492 | 713-789-1119 | SC: Daniel Island | Facility | |
| DLJ | A | DSL Internet Corporation | 5000 SW 75th Avenue | 3rd Floor | Miami | FL | 33155 | 305-779-5789 | FL | CLEC |
| DLOG | A | Dialog Telecommunications | 610 Jefferson Street | 1st Floor | Paducah | KY | 42003 | 888-439-6100 | KY | Facility |
| DLT | A | ITC DeltaCom | 7037 Old Madison Pike | Suite 400 | Huntsville | AL | 35806 | 888-430-2722 | Al, GA, Fl, LA, MS, TN, KY, NC, SC | CLEC |
| DMC | A | DiLucia Management Corp | 100 Jacobs Hall Lane | Lunsdale | PA | 19446 | 215/669-0818 | NJ | PBX | |
| DMI | A | Desktop Media | 1143 S. Broadway Ave. | Albert Lea | MN | 56007-4517 | 507/373-2155 | MN | Reseller | |
| DMR | I | (Inactive) DMR Communications | 2630 Walnut Ave. | Unit H | Tustin | CA | 92780 | 714-404-2988 | CA | Facility |
| DMSHC | C | (Cancelled) Dartmouth Medical School, Hanover | 10 Lyme Road | Hanover | NH | 03755 | 603-341-1502 | NH | PBX | |
| DNA | A | Digital Network Access Communications, Inc. | 601 1st Ave | Engineering | Rochelle | IL | 61068 | 866-444-4990 | IL | Facility |
| DNNL | A | Dunnell Telephone Company, Inc. | 123 North Seely Ave. | Dunnell | MN | 56127 | 507-695-2730 | MN | Facility | |
| DOBS | A | Dobson Wireless | 3910 South Ave | Youngstown | OH | 44512 | 423-318-2139 | TN4,KY4,KY6,KY8,NY5,NY6,MN6,MN2,MN3,MN4,OH7,WV1,WV2,PA9 | Carrier | |
| DOCK | A | Dock Woods Community | 275 Dock Drive | Lansdale | PA | 19446 | 215-368-4438 | Dock Woods Retirement Community, Towamencin Township, PA | PBX | |
| DOITT | A | New York City DoITT | 1Centre St. | Room 1327 | New York | NY | 10007 | 718-403-8888 | NY City | PBX |
| DOMIN | A | Dominion | One James Rive Plaza | 701 E Cary Street | Richmond | VA | 23219 | 804-771-4191 | Nationwide | PBX |
| DOUG | A | Douglas Telecommunications, Inc. | 1101 5th Avenue, Ste. 360 | San Rafael | CA | 94901 | 415/540-0374 | WV, Elkins | Carrier | |
| DOYLE | A | Doylestown Telephone Company | 81 North Portage Street | Doylestown | OH | 44230 | 330-658-6666 | Doylestown, OH | Facility | |
| DPCOM | A | D&P Communications Inc. | 4200 Teal Road | Petersburg | MI | 49270 | 734-279-1339 | MI | CLEC | |
| DPI | C | (Cancelled) Delta Phones, Inc. | 245 Illinois Street | Delhi | LA | 71232 | 800-814-8623 | ALL | Reseller | |
| DPT | P | Direct Partner Telecom | 110 East Broward Blvd. | 14th Floor | Fort Lauderdale | FL | 33301 | 954-769-5999 | US | VoIP |
| DRAI | A | Dickey Rural Access, Inc. | 9628 Highway 281 | PO Box 69 | Ellendale | ND | 58436 | 701/344-5005 | ND | ILEC |
| DRC | A | Dickey Rural Communications, Inc. | 9628 Highway 281 | PO Box 69 | Ellendale | ND | 58436 | 701/344-5005 | ND and SD | ILEC |
| DRTC | A | Dickey Rural Telephone Cooperative | 9628 Highway 281 | PO Box 69 | Ellendale | ND | 58436 | 701/344-5005 | ND and SD | ILEC |
| DSCI | A | DSCI Corporation | 1050 Waltham Street | Lexington | MA | 02421 | 877-344-7441 | MA, NH, RI, ME | Facility | |
| DSIWW | A | FTC Diversified Services, Inc | 1101 East Main St. | Kingstree | SC | 29556 | 843-382-1337 | SC – Florence, Williamsburg, Clarendon, Lee, Sumter | Facility | |
| DSLI | I | (Inactive) DSL Internet Corporation | 5000 SW 75th Avenue | 3rd Floor | Miami | FL | 33155 | 305-779-7777 | FL | Facility |
| DSLNT | A | DSLNET COMMUNICATIONS, LLC | 545 Long Wharf Drive, 5th Floor | New Haven | CT | 06511 | 877-646-6519 | ALL STATES | Facility | |
| DSSI | A | Baldwin County Internet/DSSI | 22645 Canal Road | Orange Beach | AL | 36561 | 888-843-6219 | FL, AL, LA | Facility | |
| DSUDE | C | (Cancelled) Delaware State University | 1200 N. Dupont Highway | Dover | DE | 19901 | 302/857-7009 | Delaware | Facility | |
| DTAS | A | Digitas, Inc. | 33 Arch Street | Floor 8 | Boston | MA | 02110 | 617-867-1000 | MA, CT, NY, IL, MI, CA, WA, GA | PBX |
| DTC | A | DTC Communications | 111 High St | Alexandria | TN | 37012-0247 | 615-529-2951 | TN | Facility | |
| DTCI | A | Dell Telphone Cooperative, Inc | 610 South Main | Dell City | TX | 79837 | 915-369-2161 | TX | Facility | |
| DTCM | A | Drenthe Telephone Company | 738 64th Street | Zeeland | MI | 49464 | 616-688-5571 | MI | Facility | |
| DTEL | A | D-TEL, LLC | 1016 Delaware Avenue | Wilmington | DE | 19806 | 800-249-6719 | DE | Reseller | |
| DTICH | A | Deltathree, Inc. | 75 Broad Street | 3rd Floor | New York | NY | 10004 | 888-722-2599 | All | VoIP |
| DTIMN | OB | (Out of Business) Dakota Telecom, Inc. | 29705 453rd Avenue | Irene | SD | 57037-0066 | 800-239-7501 | MN, SD | Facility | |
| DTS | C | (Cancelled) Verizon | 1710 H Street NW | 8th Floor | Washington | DC | 20001 | 202-927-9000 | US Treasury | Facility |
| DURAC | A | Duracell Inc | 8 Research Dr | Berkshire Corporate Park | Bethel | CT | 06801 | 203-796-4000 | CT | PBX |
| DUTIL | A | Dalton Utilities | 1200 V.D. Parrott Jr. Pkwy, Administration Bldg. | Dalton | GA | 30720 | 706-281-1000 | GA | Facility | |
| DVC | OB | (Out of Business) Ionex Communications, Inc. | 15305 Dallas Parkway, Ste. 1500 | Dallas | TX | 75001 | 877/333-2555 | KS | Facility | |
| DVDSN | A | Davidson Telecom, LLC | PO Box 2342 | Davidson | NC | 28036 | 704-896-5915 | MO | Facility | |
| DVSN | C | (Cancelled) DataVision Communications | 489 third Street | Gervais | OR | 97026 | 503-949-2610 | OR | Facility | |
| DXN | A | Dixie-Net Communications | 301 North Main | PO BOX 28 | Ripley | MS | 38663 | 662-993-2222 | MS | Facility |
| DYR | A | DayStarr Communications | PO Box 250 | Corunna | MI | 48817 | 888-618-3828 | MI | Facility | |
| EAGL | A | Eagle Valley Telephone Company | 108 Robert St. N | Clarissa | MN | 56440 | 320/848-3221 | MN | LEC | |
| EAGLE | A | Eagle Telecommunications | 1800 Second Street | Suite 881 | Sarasota | FL | 34236 | 727-828-0310 | FL | Facility |
| EASTX | A | Eastex Telephone Cooperative, Inc. | PO Box 150 | Henderson | TX | 75653-0150 | 903-854-1000 | East TX | Facility | |
| EASY | A | EasyTEL Communications Carrier Corp. | 7335 S. Lewis Ave., Suite 100 | Tulsa | OK | 74136 | 918-523-8190 | OK | Facility | |
| EATC | A | Easton Telephone Company | 33 Cedar Street | Easton | MN | 56025 | 507-526-3252 | MN | Facility | |
| EATEL | A | East Ascension Telephone Company | 913 S. Burnside | Gonzales | LA | 70737 | 225-621-4288 | LA | ILEC | |
| ECC | C | (Cancelled) Everest Connections Corporation | 5555 WingHaven Blvd | O’Fallon | MO | 63366 | 888-572-2041 | KS | Facility | |
| ECCM | C | (Cancelled) -East Coast Communication of MASS | 25 Brock Street | PO Box 649 | Stoughton | MA | 02072-0649 | 781/341-2660 | MA | PBX |
| ECGEM | A | Enhanced Communications Group, LLC | 312 SE Delaware | Bartlesville | OK | 74003 | 800-275-0014 | All | Reseller | |
| ECICI | I | (Inactive) ECI Communications, Inc. | 575 E. Locust, Suite 201 | Fresno | CA | 93720 | 559-447-2100 | All | Reseller | |
| ECKLE | A | Eckles Telephone Company | 115 West Main Street | New Prague | MN | 56071 | 507-526-3252 | MN | Facility | |
| ECKNP | C | (Cancelled) Eckles Telephone Company | 115 Main Street West | New Prague | MN | 56071 | 952-758-2501 | New Prague, MN | ILEC | |
| ECOM | A | E.Com Technologies, LLC | 750 Liberty Drive | Westfield | IN | 46074 | 866-784-5561 | IN | Facility | |
| ECOOP | C | (Cancelled) Exeter Region Co-op School District | 24 Front Street | Exeter | NH | 03833 | 603-772-1212 | Exeter Region Cooperative School District | PBX | |
| ECTY | A | Ecuity Advanced Communications | 800 Bellevue Way NE | Suite 600 | Bellevue | WA | 98004 | 877-558-8663 | All | Facility |
| EEX | A | Genesis Telecommunications, LLC | 1117 Reynolds Ave. | Greenwood | SC | 29649 | 864-388-7447 | SC | Facility | |
| EGHT | A | 8×8, Inc. | 3151 Jay Street | Santa Clara | CA | 95054 | 408-654-3348 | US | VoIP | |
| EGX | A | EGIX Network Services, Inc. | 11550 North Meridian Street, Ste. 500 | Carmel | IN | 46032 | 800/489-6655 | IN, IL, NY, CA | Facility | |
| EKN | A | East Kentucky Network, LLC | 355 Village Drive | Prestonsburg | KY | 41653 | 606/477-1010 | Kentucky | Cellular | |
| ELCTA | A | Electra Telephone Company | 221 North Main | PO Box 111 | Electra | TX | 76360 | 940-495-2192 | Etectra, TX | etx |
| ELD | OB | (Out of Business) El Dorado Cellular DBA Mountain Cellular | 5174 Hillsdale Circle | El Dorado Hills | CA | 95762 | 800-924-3844 | CA | Facility | |
| ELIG | A | Electric Light Wave, Inc. | 4400 NE 77 St | Vancouver | WA | 98663 | 866-816-6461 | OR, WA, ID, UT, AZ, CA | Facility | |
| ELJAY | A | Ellijay Telephone Company | PO Box 0 | 224 Dalton Street | Ellijay | GA | 30540 | 706-276-9851 | GA | Facility |
| ELRB | A | Ellerbe Telephone Company | 254 Second Street | Ellerbe | NC | 28338 | 910-652-2221 | NC | LEC | |
| ELTEL | A | El Paso Telephone Company | 48 West First Street | PO Box 257 | El Paso | IL | 61738 | 309-527-4500 | IL | RLEC |
| ELZ | A | Elizabeth Telephone Company | PO Box 167 | Sulphur | LA | 70664 | 800-737-3900 | LA | ILEC | |
| EMERY | A | Emery Telephone | 455 East Highway 29 | Orangeville | UT | 84537 | 435-748-2223 | Emery County, UT | Facility | |
| EMTEL | A | Eagle Mountain Telecommunications | 1680 East Heritage Drive | Eagle Mountain | UT | 84043 | 801-592-0433 | Eagle Mountain City, UT | Facility | |
| ENCOR | OB | (Out of Business) Encore Communications, LLC | 124 Oak Avenue South | Owatonna | MN | 55060 | 507-634-2505 | Owatonna | Facility | |
| ENMR | A | ENMR Telephone Cooperative, Inc. | 7111 N Prince Street | Clovis | NM | 88101 | 505-389-5100 | NM, TX | Facility | |
| ENTEL | A | EN-TEL LLC | 9938 State Hwy 55 NW PO Box 340 | Annandale | MN | 55302-0340 | 888-344-3730 | MN | Facility | |
| ENV | P | Envision Analysts LLC | 1101 Ray Street | Manchester | NH | 03104 | 603-669-9911 | NH | PSALI | |
| EOT | A | Eastern Oregon Telecom | 750 W. Elm Avenue | Hermiston | OR | 97838 | 541/561-8686 | OR | Facility | |
| EQUIV | A | Equivoice, L.L.C. | 200 N. Harrison Street, Suite 106 | Algonquin | IL | 60102 | 800/398-6696 | IL, WI | Facility | |
| ERN | C | (Cancelled) Ernest Communications | 6475 Jimmy Carter Blvd | Norcross | GA | 30071 | 678-733-1969 | ALL | Payphone Facility | |
| ERNST | C | (Cancelled) Ernst & Young LLP | 5 Times Square | New York | NY | 10036-6523 | 866-285-0070 | NY | PBX | |
| ESCH | A | Eschelon Telcom, Inc. | 730 Second Ave. South | Suite 900 | Minneapolis | MN | 55402 | 888-611-6621 | CO,AZ, UT, MN, OR, WA | Facility |
| ESCHP | A | Eschelon Telecom, Inc. of Minnesota | 730 2nd Ave. S., Suite 900 | Minneapolis | MN | 55402 | 888-611-6621 | MN, CO, UT, AZ, WA, OR | Facility | |
| ETC | A | Enhanced Telecommunications Corporation | 244 State Route 129 S | Batesville | IN | 47006 | 812-623-3822 | IN | CLEC | |
| ETCAT | A | 911 ETC, Inc./Dialtone provided by AT&T | 19119 North Creek Parkway | Bothell | WA | 98011 | 800/829-1011 | USA | DB Mgmt. | |
| ETCCM | A | 911 ETC, Inc./dialtone by CIMCO | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 800-922-4626 | USA | PBX |
| ETCCX | A | 911 Etc, Inc. dialtone by Cox Communications | 19119 North Creek Parkway, Suite 101 | Bothell | WA | 98011 | 888-326-9266 | USA | PBX | |
| ETCES | A | 911 Etc, Inc./ dialtone by Eschelon | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 612-436-0216 | USA | PBX |
| ETCEW | A | 911 ETC, Inc./dialtone by Time Warner Tel | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 800-875-9489 | USA | PBX |
| ETCFO | A | 911 ETC., Inc/dialtone provided by Focal | 19119 N. Creek Pkwy., Suite 101 | Bothell | WA | 98011 | 888-362-2591 | USA | Data Mgmt | |
| ETCGA | A | ETC Communications, LLC | 224 Dalton St. | P. O. Box 0 | Ellijay | GA | 30540 | 706-276-9851 | GA, TN | Facility |
| ETCGC | A | 911 ETC, Inc./dialtone by Globalcom | 19119 North Creek Pkwy, Suite 101 | Bothell | WA | 98011 | 800-589-1531 | USA | DATA MGMT | |
| ETCHI | A | 911 ETC, Inc. | dialtone by Electric Lightwave | 19119 North Creek Pkwy, Suite 101 | Bothell | WA | 98011 | 866-816-6461 | Utah | PBX |
| ETCIN | A | 911 ETC, Inc./ Integra Telecom | 10110 North Creek Parkway, Suite 101 | Bothell | WA | 98011 | 888-842-9045 | Northwest U.S.A. | DB Mgmt. | |
| ETCMC | A | 911 ETC, Inc./ dialtone by Marathon Comm. | 19119 Northcreek Parkway | Suite 101 | Bothell | WA | 98011 | 800-398-8695 | WA | PBX |
| ETCSB | A | 9-1-1 Etc, Inc/ Dialtone by SBC Telecom | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 866-730-8154 | ALL | database |
| ETCWC | A | 911 ETC, Inc./Dialtone provided by WestCom | 19119 North Creek Parkway, Suite 101 | Bothell | WA | 98011 | 208-888-4039 | USA | PSALI DATA | |
| ETCWM | A | 911 ETC, Inc/dialtone by WorldCom | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 800-844-1001 | ALL | PBX |
| ETCXO | A | 911 ETC, Inc, | 19119 North Creek Parkway | Suite 101 | Bothell | WA | 98011 | 800-464-4402 | ALL | dtbsemgmt |
| ETEL | A | e-Tel, LLC | 401 Olive Street | Murray | KY | 42071 | 270/7613835 | KY | Facility | |
| ETI | A | Essex Telcom, Inc. | 2 E 3rd Street | Sterling | IL | 61081 | 815/380-9000 | IL | Facility | |
| ETS | A | ETS Telephone Company | 13105 Northwest Freeway, Suite 1020 | Houston | TX | 77040 | 800-829-1011 | TX | Facility | |
| ETX | A | Etex Telecom | HWY 155 NorthP.O. Box 889 | Gilmer | TX | 75644 | 877-690-2072 | TX | Facility | |
| EVER | A | Evergreen Advantage, LLC | 7 Aspen Drive, Suite 1 | South Burlington | VT | 05403 | 802-864-9899 | VT, NH | PBX | |
| EWB | A | The Electric and Water Plant Board | Network Operations Center | 220 Steele Street | Frankfort | KY | 40601 | 502-352-4372 | Franklin County, KY | Facility |
| EXACT | A | Exact 9-1-1, Ltd. | PO Box 1072 | Chardon | OH | 44024 | 440-285-7878 | OH, PA, KY, NY, WV, IN, MI | PS/ALI | |
| EXARI | OB | (Out of Business) Exario Telecom, Inc. | 600 Parsippany Rd | Suite 300 | Parsippany | NJ | 07054 | 866-366-2416 | ALL | Facility |
| EXL | I | (Inactive) Excel Telecommunications, Inc. | 1600 Viceroy | Dallas | TX | 75235 | 800-705-8929 | All | Facility | |
| EXOP | A | EXOP of Missouri, Inc. | 303 N. Jefferson St. | Kearney | MO | 64060 | 816-903-3967 | Kearney, MO | Facility | |
| EXPR | C | (Cancelled) Express Telephone Services | 6331 Grapevine Highway | Suite 250 | North Richland Hills | TX | 76180 | 817/907-8813 | TX, CA, OK | CLEC,UNE-P |
| FARBR | P | Farber Telephone Company | Main & Linn | Farber | MO | 63345 | 573-249-9800 | MO | CLEC | |
| FARPT | OB | (Out of Business) FairPoint Communications Corp. | 99 Troy Rd., Suite , PO Box 610 | East Greenbush | NY | 12061 | 518-392-1237 | ALL | CLEC | |
| FATC | A | Five Area Telephone Co-op | 302 Uvalde Street | Mulshoe | TX | 79347 | 806-272-5533 | TX | ILEC | |
| FBCC | C | (Cancelled – see CCITX) Fort Bend Telephone Company | 300 Decker Drive | Irving | TX | 75062 | 888-608-7822 | TX | Facility | |
| FBCOM | A | F & B Communications | 103 Main Street N | PO Box 309 | Wheatland | IA | 52777-0309 | 563/374-1238 | IA | Facility |
| FBRCM | A | FiberComm, L.C | 901 Steuben St. | Sioux City | IA | 51101 | 712-224-2020 | IA, SD, NE | Facility | |
| FCA | A | Frontier Communications of America | 137 Harrison Street | Gloversville | NY | 12078-4815 | 800-779-0570 | ALL | Facility | |
| FCA01 | A | Fidelity Communications Services Inc | 64 N. Clark Street | Sullivan | MO | 63080 | 573-426-6111 | Rolla, Waynesville, St. Robert, Fort Leonardwood, MO | CLEC | |
| FCAMN | C | (Cancelled-See FROMN) Frontier Communications of America | 180 South Clinton Ave | Rochester | NY | 14646 | 800-435-1504 | MN, IA, WI, AL, FL, IN, IL | CLEC | |
| FCBNK | A | First Commonwealth | 22 North 6th Street | Indiana | PA | 15701 | 724-463-5595 | PA | VoIP | |
| FCGOV | A | Frederick County Government | 12 East Church Street | Frederick | MD | 21701 | 301-694-1603 | MD | PBX | |
| FCPEN | A | Frontier, A Citizens Communications Co. | 137 Harrison Street | Gloversville | NY | 12078-4815 | 717/355-7300 | New Holland, Canton, Lakewood, Breezewood, Oswayo | ILEC | |
| FCPOT | A | Forest County Potawatomi Community | 5419 Everybodys Road | PO Box 340 | Crandon | WI | 54520 | 715-889-0063 | Forest County, WI | PBX |
| FCPS | A | Frederick Co Public Schools | 7630 Hayward Road | Technology Services | Frederick | MD | 21702 | 301-748-7940 | School District | PBX |
| FCSI | A | First Cellular of Southern Illinois | 417 S. 42nd St | Mt. Vernon | IL | 62864 | 618-244-8583 | IL | Wireless | |
| FCSII | A | Fidelity Communications Services II, Inc. | 64 North Clark Street | Sullivan | MO | 63080 | 866-262-1611 | Bourbon, Cuba, St. James, MO | Facility | |
| FCT | A | Farmers Cellular Telephone Inc. | 450 Main Street East | Rainsville | AL | 35986 | 256-638-2100 | Lost or Stolen Phones | Cellular | |
| FCTI | A | Forest City Telecom, Inc. | 704 E. Main St. | Lake Mills | IA | 50450 | 888-766-3674 | IA | Facility | |
| FDI | A | First Digital Telecom | 90 S. 400 West | Suite M100 | Salt Lake City | UT | 84101 | 801-456-1000 | UT | Facility |
| FDN | A | FDN Communications | 2301 Lucien Way | Suite 200 | Maitland | FL | 32751 | 877-433-6662 | FL, GA | Facility |
| FDU | A | Fairleigh Dickinson University | 1000 River Rd. | Teaneck | NJ | 07666 | 201-692-2222 | NJ | Centrex | |
| FEC | I | (Inactive) FEC Communications, LLP. | PO Box 1237 | Rockwall | TX | 75087 | 800-541-2662 | TX | Facility | |
| FED | A | Federated Telephone Cooperative | 405 2nd Street East | PO Box 156 | Chokio | MN | 56221 | 320-324-7111 | MN | ILEC |
| FELTN | A | Felton Telephone Company | 425 Minnesota Avenue | Felton | MN | 56536 | 218-494-6350 | MN | LEC | |
| FFC | C | (See FRFLD) Fairfield Communications | 776 US Highway 321 Bus. S | Winnsboro | SC | 29180 | ||||
| FIBNT | A | FiberNet, L.L.C | 211 Broad Street | Charleston | WV | 25301 | 304-720-2100 | WV | CLEC | |
| FIRST | A | 1stel, Inc | 205 E Henderson | Cleburne | TX | 76031 | 888-999-6225 | TX | Facility | |
| FITEL | C | (Cancelled) Florida Insitute of Technology | 150 West University Blvd. | Building 409 | Melbourne | FL | 32901 | 321-674-8111 | Melbourne, FL | PBX |
| FLETC | C | (Cancelled) Fletcher Allen Health Care | 1 South Prospect Street | Burlington | VT | 05401 | 802-656-5655 | VT | PBX | |
| FLINT | A | Flint Telecom, Inc. | Flint House | 1153 West Tee Time Drive | Farmington | UT | 84025 | 004-670-865-1515 | National | VoIP |
| FLL | A | FullTel, Inc. | 201 Robert S. Kerr | Suite 210 | Oklahoma City | OK | 73102-4202 | 405-235-4905 | OK | CLEC |
| FMMT | A | Farmers & Merchants Mutual Telephone | 210 West Main Street | P.O. Box 247 | Wayland | IA | 52654-0247 | 319-256-2736 | IA | Facility |
| FMT | A | Filer Mutual Telephone Company | 405 Main | P.O. Box 89 | Filer | ID | 83328 | 208-326-4331 | ID, NV | Facility |
| FMTC | A | Fort Mill Telephone Company | 200 Tom Hall St. | Fort Mill | SC | 29715 | 803-324-7203 | SC | ILEC | |
| FMTCA | A | Farmers Mutual Telephone Company | 410 Broad Avenue | Stanton | IA | 51573-0220 | 712-829-2111 | Stanton, New Market, Bethesda IA | Facility | |
| FMTCO | A | Farmer’s Mutual Telephone Company | 319 SW 3rd Street | PO Box 1030 | Fruitland | ID | 83619 | 208-452-6499 | Fruitland, ID | Facility |
| FMTEL | A | Ft. Mojave Telecommunications, Inc. | 8490 S Highway 95 | Suite 104 | Mohave Valley | AZ | 86440 | 928-346-2500 | CA | ILEC |
| FMTI | A | Farmers Mutual Technologies, Inc | PO Box 368 | Bellingham | MN | 56212-0368 | 320-568-2105 | MN | Facility | |
| FMTJ | A | Farmers Mutual Telephone Company | 541 Young St. | P. O. Box 249 | Jesup | IA | 50648 | 319-827-1151 | Jesup, IA | ILEC |
| FNMA | C | (Cancelled) Fannie Mae | 11600 Sallie Mae Dr. | 5th Floor | Reston | VA | 20190 | 703-833-0200 | VA, MD, DC | PBX |
| FNTN | A | Fenton Cooperative Telephone Company | 300 2nd Street | PO Box 77 | Fenton | IA | 50539 | 515-889-2785 | Kossuth and Palo Alto Counties, IA | LEC |
| FOCAL | A | Broadwing Communications | 200 North LaSalle St. | 10th Floor | Chicago | IL | 60601 | 866-362-2591 | IL, CA, NY, NJ, PA, DE, MD, VA,CT, WA, GA, MA, MI, FL, IN, T | CLEC |
| FONES | A | Fones4All Corporation | 6320 Canoga Ave. | Suite 650, Trillium building | Woodland Hills | CA | 91367 | 818-633-5344 | CA | Facility |
| FOX | A | Ecuity Advanced Communications | 800 Bellevue Way NE | Suite 600 | Bellevue | WA | 98004 | 877-558-8663 | All | VoIP |
| FPS | I | (Inactive) Florida Phone Service | 7181 SW 117 Ave. | Miami | FL | 33183 | 786-261-6722 | FL | Facility | |
| FPSI | A | Florida Phone Service, Inc. | 7177 SW 117 Avenue | Miami | FL | 33183 | 786-261-6722 | FL | Facility | |
| FRAN | A | Franciscan Oaks | 19 Pocono Road | Denville | NJ | 07834 | 973-586-6000 | NJ | PBX | |
| FRCIT | A | Frontier, A Citizens Communications Co | 137 Harrison Street | Gloversville | NY | 12078-4815 | 800/435-1504 | IN | ILEC | |
| FRETL | C | (Cancelled) Fretel Communications | 110 East | Main Street | St. Anthony | ID | 83445 | 208/524-7725 | ID | Facility |
| FRFLD | A | Fairfield Communications | 112 York St. | Chester | SC | 29706 | 803-985-3191 | SC | CLEC | |
| FRMST | A | Foremost Telecommunications | 1411 E. Campbell Road; Suite 1400 | Richardson | TX | 75081 | 877-546-8376 | TX | Facility | |
| FROMI | A | Global Crossing | 435 W. Commercial St. | Suite 3 | E. Rochester | NY | 14445 | 888-859-0911 | All areas | Facility |
| FROMN | A | Frontier, A Citizens Communications Co. | 137 Harrison Street | Gloversville | NY | 12078-4815 | 800-435-1504 | MN,FL,MS,MI,OH,IA,IL,GA,AL,WI | ILEC | |
| FRTHO | A | Frontier, A Citizens Communications Co | 137 Harrison Street | Gloversville | NY | 12078-4815 | 800/435-1504 | IN: Thorntown | ILEC | |
| FRTTY | A | Fort Randall Telephone Company | 1605 Laurel Street | PO Box 608 | Tyndall | SD | 57066 | 605-589-3366 | SD | Facility |
| FTC | A | Fidelity Telephone Company | 64 N. Clark Street | Sullivan | MO | 63080 | 573-468-5108 | Sullivan, Gerald, Owensville, New Haven MO | ILEC | |
| FTCAL | A | Farmers Telephone Cooperative, Inc. | 144 McCurdy Avenue North | PO Box 217 | Rainsville | AL | 35986 | 256-638-2144 | AL | Facility |
| FTCAR | P | Fort Carson DOIM | 6151 Specker Ave. | Fort Carson | CO | 80913 | 719-526-2270 | CO | Facility | |
| FTCCO | A | Farmers Telephone Company, Inc. | 26077 Highway 666 | P.O. Box 369 | Pleasant View | CO | 81331-0369 | 970-562-4211 | CO, Portions of Montezuma and Dolores Counties | ILEC |
| FTCMS | A | Franklin Telephone Company | 1094 Monroe Road | PO Box 446 | Bude | MS | 39601 | 601-384-8095 | MS | Facility |
| FTCSC | A | Farmers Telephone Cooperative, Inc. | 1101 E. Main St. | Kingstree | SC | 29556 | 843-382-1337 | SC: Florence, Williamsburg, Clarendon, Lee, Sumter, Kershaw, | Facility | |
| FTHL | A | Foothills Telephone Company | 1621 Kentucky Route 40 W | Staffordsville | KY | 41256 | 606-297-3501 | Counties: Johnson, Magoffin, Lawrence | Facility | |
| FTN | A | foreThought.net (Futurum Communications Corp) | 910 16th Street | #1220 | Denver | CO | 80202 | 303-944-0267 | Area code 303/720 overlay | Facility |
| FTONY | A | Frontier Telephone | 120 Plymouth Avenue North | Rochester | NY | 14608 | 716-777-1811 | NY | Facility | |
| FTT | C | (Cancelled) Federal TransTel, Inc. | 2868 Acton Rd, Suite 100 | Birmingham | AL | 35243 | 888-388-4400 | All | Reseller | |
| FULLS | A | Full Service Network | 1420 Centre Ave. | Pittsburgh | PA | 15219 | 888-327-9115 | PA | Facility | |
| FULTN | A | Fulton Telephone Company | 402 W Beene Street | Fulton | MS | 38843 | 662-862-2196 | Fulton, Mantachie, Fairview, Tremont, MS | ILEC | |
| FUTC | I | (Inactive) 1st United Tel-Com, Inc. | 309 PR 2397 | PO Box 108 | Alvord | TX | 76225 | 940-393-1532 | TX | Reseller |
| FWS | OB | (Out of Business) AT&T Fixed Wireless | 11261 Willows Rd | Redmond | WA | 98052 | 800-551-3083 | All | Facility | |
| FWT | A | Pathway Com-Tel Inc. | 2950 Old SH 174 | P.O. Box 1298 | Joshua | TX | 76058 | 817-447-2222 | Burleson, Texas | LSP |
| G2C | A | Go2Call.com, Inc. | 1603 Orrington Ave. | Suite 1190 | Evanston | IL | 60201 | 320-202-5059 | All | VoIP |
| G4911 | A | Otel Telekom Inc | 1 Sundial Ave | Ste 210 | Manchester | NH | 03103 | 603-296-4499 | NH | Facility |
| GABE1 | C | (Cancelled-See NUVOX) Gabriel Communications, Inc. (Nuvox) | 16090 Swingley Ridge Rd., Suite 500 | Chesterfield | MO | 63017 | 800-257-0281 | MO, KS, AR, OK, TX, IN, IL, OH, KY | Facility | |
| GAN | A | Goldfield Access Network, L.C. | 536 N. Main Street | PO Box 67 | Goldfield | IA | 50542 | 515-825-3996 | IA | UNE |
| GANAD | A | Ganado Telephone Co., Inc. | 115 W. Putnam | Ganado | TX | 77962 | 361-771-3331 | TX | Facility | |
| GBQ | A | GlobalCom | 333 W. Wacker Drive | 15th floor | Chicago | IL | 60606 | 800-589-1531 | IL, WI, TX, CA | Facility |
| GBT | A | Golden Belt Telephone Association, Inc. | PO Box 229 | 103 Lincoln | Rush Center | KS | 67575 | 785-372-4236 | KS | Facility |
| GBZ | C | (Cancelled) GoBeam Services, Inc | 5050 Hopyard Road | Suite 350 | Pleasanton | CA | 94588 | 800-278-7114 | ALL | Facility |
| GCEC | A | GCEC Technologies | 600 Highway 75 North | Van Alstyne | TX | 75495 | 903-482-7000 | TX | Facility | |
| GCHCO | P | Goochland County, VA | 1800 Sandy Hook Road; Suite 340 | Goochland | VA | 23063 | 804-556-5349 | VA | PBX | |
| GCI | A | General Communications Corp, Inc. | 2550 Denali Street | Suite 1000 | Anchorage | AK | 99503 | 907-868-5555 | AK | CLEC |
| GCINC | A | Granite Construction | 585 W Beach Street | Building 1 | Watsonville | CA | 95076 | 831-724-1011 | CA, NV, AZ, NY, TX, FL, UT, MN, OR, AR | IPTEL |
| GDWIL | A | Goodwill Industries | 1500 Mission Street | San Francisco | CA | 94103 | 888/362-2522 | CA,NY,NJ,PA,DE,MD,VA,DC,WA,GA,MA,MI,FL,IN,TX,MN,OH | PBX | |
| GECP | A | General Electric Company | 320 Great Oaks Office Park, Suite 320 | Albany | NY | 12203 | 800-239-9973 | NY | PBX | |
| GEIS | C | (Cancelled) GE Global Exchange Services | 100 Edison Park Drive | Gaithersburg | MD | 20878 | 301/340-4187 | MD | PBX | |
| GGN | A | Gillette Global Network, Inc. | 39 Broadway | 19th Floor | New York | NY | 10006 | 800-562-4206 | NY, NJ | Facility |
| GHT | A | Grande Communications Networks, Inc. | 401 Carlson Circle | San Marcos | TX | 78666 | 512-878-4000 | TX, GA, FL, IN, | CLEC | |
| GHTC | A | Green Hills Telephone Company | 7926 NE State Route M | PO Box 227 | Breckenridge | MO | 64625 | 660-707-2769 | MO | Facility |
| GIANT | A | Giant Communications, Inc. | 418 West 5th Street, Suite B | Holton | KS | 66436 | 620-672-9991 | KS | Reseller | |
| GITCO | A | Germantown Independent Telephone Company | 36 N Plum Street | Germantown | OH | 45327 | 937-855-6511 | OH | Facility | |
| GLANT | A | Glandorf Telephone Co., Inc. | 135 S Main Street | Glandorf | OH | 45848 | 419-538-6987 | OH | Facility | |
| GLDTC | A | Goldfield Telephone Company | 536 N. Main Street | PO Box 67 | Goldfield | IA | 50542 | 515-825-3766 | IA | Facility |
| GLI | A | Great Lakes of Iowa dba Cellular One | 800 N. Grand Ave | Spencer | IA | 51301 | 712-270-2000 | IA15 | WSP | |
| GMAB | OB | (Out of business – see PCS) TGEC Communications Co., LLC | 517 – D Marine View Ave. | Belmont | CA | 94002 | 800-829-4861 | CA | Facility | |
| GNDE | A | Grande Communications Networks, Inc. | 401 Carlson Circle | San Marcos | TX | 78666 | 512/878-4000 | TX, GA, IN, FL | Faciltiy | |
| GNP | A | Global Naps | 10 Merrymount Road | Quincy | MA | 02169 | 617/507-5100 | all of US | Facility | |
| GORKS | A | Gorham Telephone Company | 105 Market St. | Gorham | KS | 67640-0235 | 785-637-5300 | Gorham & Waldo, KS | LEC | |
| GPC | A | GulfPines Communications | 817 S. Congress Street | Jackson | MS | 39201 | 601-353-2001 | MS | CLEC | |
| GPCI | A | Great Plains Communications, Inc. | 1635 Front St. PO Box 500 | Blair | NE | 68008-0500 | 888-343-8015 | NE, SD, CO, KS | Teleco | |
| GPI01 | P | General Parts, Inc. | Telecom | 4729 Hargrove Road | Raleigh | NC | 27616 | 919-227-5193 | NC | PBX |
| GRACE | A | Graceba Total Communications, Inc. | 401 Third Ave | Ashford | AL | 36312 | 888-472-2322 | AL | ILEC | |
| GRAN | A | Granada Telephone Company | 211 Main St. S. | P. O. box 428 | Hector | MN | 55342 | 320-848-3221 | MN | Facility |
| GRAND | A | Grand Telephone Company, Inc. | 226 S. 4th St. | Jay | OK | 74346 | 918-253-7660 | OK | ILEC | |
| GRC | A | Gallatin River Communications | 2296 N. Henderson Street | Galesburg | IL | 61401 | 800-238-3705 | IL | ILEC; CLEC | |
| GRCI4 | A | Grande River Communications, Inc. | 480 South 6th Street | Raymondville | TX | 78580 | 800-687-9725 | TX | Facility | |
| GRCOL | A | Grace College | 200 Seminary Drive | Winona Lake | IN | 46590 | 574-372-5100 | IN | PBX | |
| GRMD | A | Grand Mound Cooperative Telephone Assoc. | 705 Clinton Street | PO Box 316 | Grand Mound | IA | 52751-0316 | 563/847-3000 | IA | Facility |
| GRMTC | A | Grand River Mutual Telehone Corp | 1001 Kentucky St | Princeton | MO | 64673 | 800-422-3757 | MO, IA | Facility | |
| GRTI | A | Gila River Telecommunications, Inc. | 7065 W. Allison Dr. | P.O. Box 5015 | Chandler | AZ | 85226 | 520-796-5544 | AZ | Facility |
| GRVS | A | Gervais Telephone Company | 489 Third Street | Gervais | OR | 97026 | 503-316-8299 | OR | Facility | |
| GSAR7 | C | (Cancelled) General Services Administration | 501 W. FelixBldg 23 | Ft. Worth | TX | 76115 | 888-424-2274 | 501 W. Felix, Ft. Worth, TX | PBX | |
| GSASF | A | 911 ETC. Inc. | 19119 North Creek Parkway, Ste. 101 | Bothell | WA | 98011 | 800/829-1011 | USA | Facility/PBX | |
| GSD | A | Gorham School Department | 381 Main Street, Suite 4 | Gorham | ME | 04038 | 207-222-1000 | Gorham, ME | PBX | |
| GST | A | Granite State Telephone, Inc. | 600 S. Stark Hwy. | PO Box 87 | Weare | NH | 03281 | 603-529-9931 | Chester, Hillsboro Upper Village, Washington, Weare, NH | LEC |
| GSTAR | A | GoldStar Communications, LLC | 301 West South Street | New Knoxville | OH | 45871 | 419-753-2000 | OH | Facility | |
| GTB | A | Global Telecom Brokers | 500 Redland Court | Suite 309 | Owings Mills | MD | 21117 | 410-581-4833 | MD | Facility |
| GTC | A | GTC Telecom | 3151 Airway Ave. | Building P-3 | Costa Mesa | CA | 92626 | 714-549-7700 | TX | Reseller |
| GTCGA | A | Glenwood Telephone Company | 202 W. Fourth Avenue | Glenwood | CA | 30428 | 912-209-1228 | GA | Facility | |
| GTCOM | A | GT Com | PO Box 186 | Florala | AL | 36442 | 850-229-7241 | FL, GA | Loc. Excha | |
| GTE | C | (Cancelled – See VERIZ)GTE Telephone Operations | FLTP0997, 10402 N. 56th St. | Temple Terrace | FL | 33617 | 800-483-0911 | AL,CA,FL,HI,IL,KY,MI,MO,ID,OH,OR,SC,TX,WA,WI | ILEC | |
| GTECC | C | (Cancelled) GTE Communications | 5221 North O’Conner Blvd. MC-HQL09A68 | Irving | TX | 75038 | 888-562-8835 | LATA 722, San Francisco, CA | Facility | |
| GTEL | A | Globetel Communications Corp. | 9050 Pines Blvd. | #110 | Pembroke Pines | FL | 33024 | 888-819-4344 | US | VoIP |
| GTEW | C | (Cancelled) GTE Wireless Incorporated | 245 Perimeter Center Pkwy | Atlanta | GA | 30346 | 800-621-2622 | VA, TN, NC, SC, GA, FL, AL, MS, AR, PA, OH, IN, IA, TX, NM, | CMRS | |
| GTLCO | A | Georgetown Telephone Company, Inc. | 1154 Railroad Avenue | PO Box 137 | Georgetown | MS | 39078 | 601-858-2211 | MS | LEC |
| GTVL | A | Geetingsville Telephone Co., Inc. | 9155 N. County Rd, 200 E | Frankfort | IN | 46041-7799 | 765/654-1613 | IN | Facility | |
| GVC | A | Guadalupe Valley Communications Systems | 36101 FM 3159 | New braunfels | TX | 78132-5900 | 830-885-4411 | TX | Facillity | |
| GVI | A | Grand Valley Internet | 822 North Ave. | Grand Junction | CO | 81501 | 970-433-2941 | CO | Facility | |
| GVT | A | Guadalupe Valley Telephone Cooperative | 36101 FM 3159 | New Braunfels | TX | 78132 | 830-885-4050 | TX | Facility | |
| GVTC | A | Garden Valley Telephone Company | 201 Ross Ave. | Erskine | MN | 56535 | 218-687-5251 | MN, ND | Facility, PBX | |
| GWC | I | (Inactive) Great Western Cellular Holding LLC | 998 Westmeade Dr. | Chesterfield | MO | 63005 | 720-733-2989 | MN | CMRS | |
| GWS | C | (Cancelled) Great West Services, Ltd. | 5307 E. Mockingbird Lane Suite 350 | Dallas | TX | 75206 | 800-452-3412 | Burleson, TX | LSP | |
| GWTC | A | Golden West Telcommunications | 415 Crown Street | PO Box 411 | Wall | SD | 57790 | 605-279-7000 | SD, ND, WY | ILEC |
| GYU | A | Grundy Center Communications Utility | 706 6th Street | PO Box 307 | Grundy Center | IA | 50638 | 319/825-5207 | IA | Facility |
| HABC | A | Housing Authority of Baltimore County | 417 East Fayette Street | Suite 1204 | Baltimore | MD | 21202 | 410-361-9660 | MD | PBX |
| HALST | A | Halstad Telephone Company | 345 2nd Ave. West | PO Box 55 | Halstad | MN | 56548 | 218-456-2125 | MN, ND | Facility |
| HAMI | A | Hamilton Telecommunications | 1001 12th Street | Aurora | NE | 68818-9987 | 402-694-5101 | NE | Facility | |
| HANC | A | Hancock Telecom | 2331 E 600 N | Greenfield | IN | 46140 | 317-326-3131 | IN | Facility | |
| HAR | A | Hargray, Inc. | 856 William Hilton Pkwy. | Hilton Head Island | SC | 29938-5986 | 843-379-6000 | SC, GA | Facility | |
| HARBO | A | Harbor Communications, LLC | 618 Azalea Road | Mobile | AL | 36609 | 251/602-5507 | All | Facility | |
| HARM | A | Harmony Telephone Company | 35 1st Ave. NE | PO Box 308 | Harmony | MN | 55939-0308 | |||
| HBC | A | Hiawatha Broadband Comm, Inc. | 58 Johnson Street | Winona | MN | 55987 | 507-474-4000 | Winona, Wabasha County | CLEC Facility | |
| HBCLE | A | H&B Cable | 108 N. Main | PO Box 108 | Holyrood | KS | 67450 | 785-252-3384 | Barton County, KS | CLEC |
| HBF | A | HBF Group, Inc. | 700 Lavaca Street | Suite 1200 | Austin | TX | 78701 | 512-633-2593 | US | VPC Other – ALI Database Provider |
| HBRD | A | Hubbard Co-Op Telephone Assn. | 306 E. Maple Street | P.O. Box 428 | Hubbard | IA | 50122-0428 | 641-864-2273 | IA | Facility |
| HBTC | A | Hillsboro Telephone Company | 121 Mill Street | Hillsboro | WI | 54634 | 608-489-3230 | WI | Facility | |
| HCC | A | Hood Canal Communications | 300 E. Dalby Road | Mason County | Union | WA | 98592 | 360/898-2481 | Mason County, WA | ILEC |
| HCI | A | Hiawatha Communications, Inc. | 108 W. Superior Street | Munising | MI | 49862 | 800-259-7984 | MI | Facility | |
| HCTC | A | Hershey Cooperative Telephone Company | 110 S Lincoln Av | Hershey | NE | 69143 | 308-368-5561 | NE | Facility | |
| HCTCO | A | Hamilton County Telephone Co-op | Highway 142 | Dahlgren | IL | 62828 | 618-736-2211 | IL | LEC | |
| HDT | C | (Cancelled) Hawaii Direct Telephone | 1132 Bishop Street | Suite 1800 | Honolulu | HI | 96813 | 808-864-3779 | HI | PBX |
| HEMG | A | Hemingford Co-op Telephone Co | 523 Niobrara Ave. | PO Box 246 | Hemingford | NE | 69348 | 308/487-3311 | NE | Telephone |
| HEND | A | Henderson Cooperative Telephone Company | 1000 N. Main St. | Henderson | NE | 68371 | 402-723-4448 | York & HamiltonCounties in NE | Facility | |
| HIC | A | Heart of Iowa Communications Cooperative | 502 Main Street | Union | IA | 50258-0130 | 641-486-2214 | IA | Facility | |
| HKY | A | Hickory Telephone Company | 75 Main St. | Hickory | PA | 15340 | 888-721-3569 | Cross Creek, Mt. Pleasant, Cecil, Smith, Chartiers Townships | Facility | |
| HKYWR | C | (Cancelled) Hickory Tech Wireless | c/o Mark Dundas | 1640 Madison Avenue | Mankato | MN | 56001 | 507/340-9909 | Minnesota | Wireless |
| HLND | A | Highland Cellular | 550 N. Eisenhower Dr. | Beckley | WV | 25801 | 304/673-0099 | VA, WV | Cellular | |
| HMKS | A | Home Telephone Company, Inc. | PO Box 8 | 211 S. Main Street | Galva | KS | 67443 | 620-654-3381 | KS | Facility |
| HMU | A | Harlan Municipal Utility | 405 Chatburn Avenue | Harlan | IA | 51537 | 712/755-5182 | Harlan, IA | Facility | |
| HNBTL | A | H&B Communications, Inc. | 108 N. Main | PO Bos 108 | Holyrood | KS | 67450 | 785-252-3384 | Hoyrood, Bushton, Dorrance, Claflin KSEllsworth, Rice, Rus | Facility |
| HNCK | A | Hancock Telephone Co | 34 Read St | Hancock | NY | 13783 | 607-637-9911 | NY, PA | Facility | |
| HOC | A | Choice One Communications | 100 Chestnut St., Suite 700 | Rochester | NY | 14604 | 800-525-6775 | RI, MA, NY, PA, CT, OH, ME, NH | Facility | |
| HOM | A | Home Telecom, LLC | 579 Stoney Landing Road | Moncks Corner | SC | 29461 | 843-761-9112 | SC | Facility | |
| HOME | A | Home Telephone Company | 501 North Douglas St. | St. Jacob | IL | 62281 | 618-644-2111 | Illinois | ILEC | |
| HOMTC | A | Home Telephone Company | 579 Stoney Landing Road | Moncks Corner | SC | 29461 | 843-899-4000 | SC | Facility | |
| HOP | A | Hopper Telecommunications Company Inc. | 4045 Gadsden Bloutsville Road | PO BOX 10 | Walnut Grove | AL | 35990 | 205-625-7550 | AL | LEC |
| HOSPT | A | Hospers Telephone Company | 107 2nd Avenue South | Hospers | IA | 51238 | 712/752-8100 | IA | Local | |
| HOWCC | A | Howard Community College | 10901 Little Patuxent Parkway | Columbia | MD | 21044 | 410-772-4800 | MD | PBX | |
| HOWTP | C | (Cancelled) Howell Township Police Department | Old Tavern Road | Howell | NJ | 07731 | 732-616-7236 | NJ | PBX | |
| HOWUN | A | Howard University | 2301 Georgia Ave. NW, Ste. 34 | Washington | DC | 20059 | 202/806-1100 | DC | PBX | |
| HRVDU | A | Harvard University – Telecommunications | 1230 Soldiers Field Road | Boston | MA | 02135 | 800-697-4588 | MA,RI,NH,VT,ME | Centrex | |
| HTBOE | A | Howell Township Public Schools | 67 Windler Rd | Howell | NJ | 07731 | 732-267-5685 | Howell, NJ | PBX | |
| HTC | A | Harrisonville Telephone Co. | 213 South Main St. | Waterloo | IL | 62298 | 618-939-6112 | IL | Facility | |
| HTC01 | A | Highland Telephone Cooperative | 7840 Morgan Co Hwy | PO Box 119 | Sunbright | TN | 37872-0119 | 423-628-2121 | TN, KY | Facility |
| HTCC | A | HTC Communications | 3480 Hwy 701 N | Conway | SC | 29526 | 843-365-2186 | Horry & Georgetown Counties, SC | CLEC | |
| HTCCC | C | (Cancelled) Crystal Communications, Inc. | DBA HickoryTech | 221 E. Hickory Street | Mankato | MN | 56001 | 507-387-1151 | MN, IA, SD, ND, WI | Facility |
| HTCGA | C | (Cancelled) Hart Telephone Company | 196 N. Forest Ave | P.O. Box 388 | Hartwell | GA | 30643 | 706-376-4042 | Hart County, Hartwell, GA | ALL |
| HTCI | A | Horry Telephone Cooperative, Inc. | 3480 Hwy 701 N | Conway | SC | 29526 | 843-365-2186 | Horry & Georgetown Counties, SC | Facility | |
| HTCMK | A | Mankato Citizens Telephone Company | d/b/a HickoryTech | 221 Hickory St. E., P.O. Box 3248 | Mankato | MN | 56002-3248 | 507-387-1151 | MN & IA | Local Tel |
| HTCOM | A | Hutchinson Telephone Company | 235 Franklin Street SW, PO Box 279 | Hutchnison | MN | 55350 | 800-303-7023 | MN | Facility | |
| HTEL | A | The Home Telephone | 112 1st Ave. NW | PO Box 152 | Grand Meadow | MN | 55936 | 507/754-5115 | MN | LEC |
| HTFD | A | The Hartford | 2502 Rocky Point Drive | Tampa | FL | 33607 | 800-829-1011 | Tampa, FL | PBX | |
| HTI | A | Hawaiian Telecom, Inc. | 1177 Bishop Street | MC HIA06 | Honolulu | HI | 96813 | 808-546-3414 | HI | ILEC |
| HTINC | A | Hutchinson Telecommunications Inc. | 235 Franklin SW | Hutchinson | MN | 55350 | 800-303-7023 | Litchfield, MN | Facility | |
| HTJ | A | Adelphia Business Solutions | 121 Champion Way | Canonsburg | PA | 15317 | 877-321-5465 | USA – All States | Facility | |
| HTK | C | (Cancelled) Hosting-Network, Inc. | 1516 Jackson Street | Fort Myers | FL | 33901 | 941-633-7944 | FL | Facility | |
| HTNOK | A | Hinton Telephone Co | 200 W. Main Street | PO Box 1040 | Hinton | OK | 73047-1040 | 405-542-3262 | OK | ILEC |
| HTS | A | HomeTown Solutions | 508 Atlantic Ave. PO Box 107 | Morris | MN | 56267 | 320-585-4875 | MN | Facility | |
| HTSP | A | Heath Springs Telephone Company | PO BOX 400 | Lancaster | SC | 29721 | 803-283-1234 | SC Counties: Lancaster, Kershaw | ILEC | |
| HTY | A | Home Town Telephone LLC | 1525 NW 167th St | 2nd Fl | Miami | FL | 33169 | 877-488-7782 | FL | Facility |
| HUDPR | P | Hudson Preserve | 26 Beryl Way | Watervliet | NY | 12189 | 888-829-0420 | NY | PBX | |
| HUNT | A | Hunt Telecommunications | 943 Washington Street | Franklinton | LA | 70438 | 985-281-4990 | LA | Facility | |
| HUV | A | HunTel Communications | 1221 Front St. | Tekamah | NE | 68061 | 402-426-6161 | NE | Facility/Resell | |
| HUX | A | Huxley Communications Cooperative | 102 N. Main Ave | PO Box 36 | Huxley | IA | 50124 | 515-597-2000 | IA | Facility |
| HVLN | A | Haviland Telephone Co., Inc. | 106 N. Main | PO Box 308 | Haviland | KS | 67059-0308 | 620-862-5211 | KS | Facility |
| HWU | A | City of Hawarden (Hitec) | 700 7th Street | PO Box 231 | Hawarden | IA | 51023 | 712/551-2565 | IA | Faciltiy |
| HYVTL | A | Hayneville Telephone Company, Inc. | 210 E. Tuskeena St. PO Box 175 | Hayneville | AL | 36040 | 334-548-2101 | North Lowndes County, Alabama | LEC | |
| HZW | I | (Inactive) Hierholzer Communications, Inc. | 12400 State Highway 71 West | Suite 350-407 | Austin | TX | 78738 | 866-733-8878 | KS | CLEC |
| I2TEL | A | i2 Telecommunications International, Inc. | 1200 Abernathy | Suite 1800 | Atlanta | GA | 30328 | 770-512-7174 | All | VoIP |
| IAMOW | I | (Inactive) IAMO Wireless, Inc. | 104 Crook Street | P.O. Box 368 | Coin | IA | 51636 | 712-829-2800 | IA | Facility |
| IASNJ | A | Institute for Advanced Study | 51 Einstein Drive | Princeton | NJ | 08540 | 609-947-5940 | Princeton, NJ | PBX | |
| ICCI | A | Integrated Communications Consultants | 333 Washington Blvd. | #15 | Marina Del Rey | CA | 90292 | 213-232-3400 | CA,TX,IL,NY,NV,GA,UT,MA | Facility |
| ICG | C | (Cancelled) ICG Communications, Inc. | 161 Inverness Drive West | Englewood | CO | 80112 | 888-837-1067 | USA | Facility | |
| ICGIP | P | ICG Telecom Group | 161 Inverness Drive West | Englewood | CO | 80112 | 888-837-1067 | Nationwide | VoIP | |
| ICGLM | C | (Cancelled) ICG Communications | Attn: Accounts Payable | 161 Inverness Dr. West | Englewood | CO | 80210 | 88-424-4611 | CO, OH, CA, TX, AL, KY, IL, GA, NC-nationwide | Facility |
| ICI | C | (Cancelled – see MCI) Intermedia Communications, Inc. | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75082 | 800-844-1001 | AZ,AL,DC,FL,GA | Facility |
| ICI91 | C | (Cancelled – see MCI) Intermedia Communications, Inc. | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75082 | 800/844-1001 | USA | Facility |
| ICON | C | (Cancelled) Icon Telecom, Inc. | 11032 Quail Creek Rd., Suite 208 | Oklahoma City | OK | 73120 | 405-302-5166 | OK | Facility | |
| ICTC | A | IL Consolidated Telephone Co. | 121 S. 17th St. | Mattoon | IL | 61938 | 800-879-2107 | IL | Facility | |
| IDACO | A | Idacomm, Inc. | 350 N. Mitchell | Boise | ID | 83704 | 800-219-9996 | ID, AZ, NV, WA | Facility | |
| IDEA1 | A | Idea One Telecom Group, LCC | 3239 39th St. S.W. | Fargo | ND | 58078 | 701-277-6024 | West Fargo & Fargo, ND; Moorhead & Dilworth, MN | Facility & Resale | |
| IDRU | C | (Cancelled) IDT America, Corp. | 520 Broad Street | 14th Floor | Newark | NJ | 07102 | 800-889-9126 | CA | UNEP |
| IDS01 | C | (Cancelled) IDS Long Distance | 1525 N.W. 167th Suite 200 | Miami | FL | 33169 | 800-335-4437 | Florida | Facility | |
| IDTA | C | (Cancelled) IDT America, Corp. | 520 Broad Street | 14th Floor | Newark | NJ | 07102 | 800-889-9126 | CA,NY,NJ,MA,MD,PA | UNEP Reseller |
| IDTB | A | IDT – America Corp | 520 Broad Street | 14th Floor | Newark | NJ | 07102 | 973-438-4662 | National Coverage | CLEC Facility |
| IDTC | A | Dunkerton Telephone Cooperative | 701 S. Canfield Street | P.O. Box 188 | Dunkerton | IA | 50626 | 319-822-4512 | Dunkerton | Facility |
| IDXNE | A | IDX System Corp | 40 IDX Drive | Burlington | VT | 05402 | 617/424-6800 | VT, MA | Faciltiy | |
| IECCW | A | Wabash Valley College | 2200 College Drive | Mt. Carmel | IL | 62863 | 618-262-8641 | CAMPUS | PBX | |
| IES | A | Independent Emergency Services | 235 Franklin St. SW | PO Box 279 | Hutchinson | MN | 55350-0279 | 800-909-8148 | MN | CPE Equip. |
| IEY | A | I-55 Telecommunications, LLC | 650 Poydras St., Suite 1000 | New Orleans | LA | 70130 | 504-525-1170 | LA | Facility | |
| ILOKA | P | Iloka, Inc. d/b/a Microtech-tel | 4643 Ulster Way | Suite 1200 | Denver | CO | 80237 | 303-371-1008 | CO,WY,NM | CLEC Facility |
| ILOOP | C | (Cancelled) Interloop, Inc. | 2514 Hollywood Boulevard, 2nd Floor | Hollywood | FL | 33020 | 305-623-7404 | FL | Facility | |
| IMM | I | (Inactive) Integra Telecom of Minnesota, Inc. | 4690 Colorado Street SE | Prior Lake | MN | 55372 | 612-226-5611 | MN | Facility | |
| IMMIX | A | Immix Wireless | 2ND & Warwick Streets | Boyertown | PA | 19512 | 610-367-1228 | Eastern to Central PA | Carrier | |
| IND | A | Indianhead Telephone Company | N3767 4th St | Weyerhaeuser | WI | 54895 | 320-848-3221 | WI | LEC | |
| INET | C | (Cancelled) Coyote Metro, LLC | 4360 Park Terrace Dr. | Westlake Village | CA | 91361 | 310-235-3177 | CA | Resellter | |
| INLND | A | Inland Cellular Telephone Company | 102 South Second Street | PO Box 688 | Roslyn | WA | 98941 | 509/229-2500 | WA | Type 2 |
| INOVA | C | (Cancelled) Inovant, Inc. | 1764-A Old Meadow Lane | McLean | VA | 22102 | 800-773-7911 | VA | PBX | |
| INPTH | C | (Cancelled) Interpath Communications, Inc. | P.O. Box 13961 | Research Triangle Park | NC | 27709-3961 | 800-800-6300 | NC | CLEC | |
| INT | C | (Cancelled) Bell West, Inc. | 2100, 111 – 5th Avenue S.W. | Calgary, Alberta, Canada | – | T2P 3Y6 | – | Alberta (Edmonton, Calgary) BC (Vancouver) | Facility | |
| INTTC | C | (Cancelled) InTTec, Inc. | PO BOX 2799 | Gillette | WY | 82717-2799 | 888-682-1884 | WY | Facility | |
| INTWN | A | ITS Telecommunications Systems, Inc | 15925 SW Warfield Blvd | PO Box 277 | Indiantown | FL | 34956-0277 | 772/597-4140 | Indiantown, FL | Facility |
| IONEX | OB | (Out of Business) IONEX Communications South, Inc. | 15305 Dallas Parkway, Ste. 1500 | Addison | TX | 75001 | 877-333-2555 | TX, KS, MO, OK | Facility | |
| IOX | A | Ionex Communications, Inc. | 15305 Dallas Parkway, Ste. 1500 | Addison | TX | 75001 | 888-772-4724 | MO, OK, KS, AR,TX | Facility | |
| IPXCO | A | Inphonex.com, LLC | 7204 NW 31st Street | Miami | FL | 33122 | 866-337-1880 | Worldwide | VoIP | |
| IQS | A | Intelleq Communications Corporation | 14101 Wireless Way | Suite 300 | Oklahoma City | OK | 73134 | 405-391-8400 | OK | Facility |
| IRNE | A | City of Portland d/b/a IRNE | 3732 SE 99th Avenue | Portland | OR | 97266 | 503/823-5015 | Portland, OR LATA 672 | Facility | |
| ISI | I | (Inactive) Intelecom Solutions | 25 W. Jefryn Blvd. | Deer Park | NY | 11729 | 877-791-7700 | NY | Facility | |
| ISN | A | ISN Telecom | 4770 Biscayne Blvd. | Suite 880 | Miami | FL | 33137 | 786-279-4005 | FL | CLEC |
| ITC | A | Interstate Telephone Company | 910 First Street | West Point | GA | 31833 | 706-645-8855 | AL, GA | Telephone | |
| ITCG | A | Globe Telecommunication Inc. | 1241 O.G. Skinner Drive | West Point | GA | 31833 | 706-645-8855 | GA | Facility | |
| ITECH | C | (Cancelled) Inventive Technology, LTD | 107 Carter Rd | Elk City | OK | 73644 | 580-243-1559 | OK | Facility | |
| ITI | A | Interstate Telecommunications, Inc. | 1385 Weber Industrial Drive | Cumming | GA | 30040 | 800-257-6290 | VA-private payphones | POTS | |
| ITLTD | C | (Cancelled) International Telcom, Ltd. | 417 2nd Avenue West | Seattle | WA | 98119 | 206/479-1904 | WA | Faciltiy | |
| ITSFL | C | (Cancelled) ITS Telecommunications Systems, Inc. | 15956 SW Warfield Blvd | Indiantown | FL | 34956 | 561-597-2111 | FL | LEC | |
| IVC | A | Illinois Valley Cellular | 200 Riverfront Drive | Marseilles | IL | 61341 | 815-795-7795 | IL | Facility | |
| IVIC | C | (Cancelled) Iviciti Communications | 10015 Old Columbia Rd., Suite B-215 | Columbia | MD | 21046 | 410-418-4515 | MD,VA,NY | Facility | |
| IWA | A | Iowa Telecom | 115 S. Second Avenue West | Newton | IA | 50208 | 877-905-4692 | IA | PBX | |
| IWLC | C | (Cancelled) IWL Connect | 12000 Aerospace Ave., Suite 210 | Houston | TX | 77034 | 281-482-0289 | TX | CLEC | |
| JAG | A | Jaguar Communications Inc | 213 South Oak Avenue | Owatonna | MN | 55060 | 877-599-9166 | MN | Facility | |
| JBN | A | JBN Telephone Company, Inc. | 418 W 5th St | Suite A | Holton | KS | 66416 | 785-866-5130 | KS, NE | Facility |
| JCC | C | (Cancelled) Jefferson Cable & Communications | 46950 Community Plaza, Suite 201 | Sterling | VA | 20164 | 804-288-5500 | VA | CLEC | |
| JCC1 | A | James City County | Telecommunications Management | 101 Mounts Bay RoadWilliamsburyVA101 Mounts Bay Road | Williamsburg | VA | 23185 | 757-566-0112 | James City County, VA | PBX |
| JCM | I | (Inactive) JCM Networking, Inc. | 19901 W. Catawba Avenue | Suite 207 | Cornelius | NC | 28031 | 704-895-8205 | NC | Facility |
| JCV | I | (Inactive) Comcast | 617 A South Pickett Street | Alexandria | VA | 22304 | 888-516-2692 | VA, MD | CLEC | |
| JDE01 | C | (Cancelled) JD Edwards Company | 7700 Technology Way B3-3-310 | Denver | CO | 80237 | 303-334-4590 | Denver (Exchange of 303-334-XXXX) | PBX | |
| JSC | A | Johnson State College | 383 College Hill | Johnson | VT | 05656-9464 | 802/635-1205 | Johnson, VT | PBX | |
| JTC | A | Johnson Telephone Company | 205 First Ave NE | Remer | MN | 56672 | 800-566-3611 | MN | Facility | |
| KAH | A | Kancharla Corp | 6767 Old Madison Pike, Ste. 680 | Huntsville | AL | 35806 | 256/705-5100 | AL, GA, MS, TN, FL | Facility | |
| KAL | A | Kalona Co-op Telephone Company | 510 B Avenue | PO Box 1208 | Kalona | IA | 52247-1208 | 319/656-3668 | IA | Facility |
| KALI | A | Kalida Telephone Company, Inc. | 121 E. Main Street | BOX 267 | Kalida | OH | 45853 | 419-532-3218 | OH | LEC |
| KANOK | A | KanOkla Telephone Association Inc | 100 KanOkla Ave | PO Box 111 | Caldwell | KS | 67022 | 620-845-5682 | KS, OK | Facility |
| KCC | A | KCC Telecom, Inc | 955 Water Street | Kerrville | TX | 78028 | 830-257-0114 | Boerne, Gredricksburg, Kerrville areas of TX | Facility | |
| KDT | A | Falcon Broadband, Inc. | 2790 N Academy Blvd | Suite 150 | Colorado Springs | CO | 80917 | 719-499-3283 | CO | Facility |
| KET | A | Socket Telecom LLC | 1005 Cherry St. | Suite 104 | Columbia | MO | 65201 | 573-256-6200 | MO | Facility |
| KIN | C | (Cancelled) KIN Network, Inc. a/k/a KINNET | 621 Westport Blvd. | Salina | KS | 67401 | 316-386-9100 | KS | CLEC | |
| KMC | I | (Inactive) KMC Telecom | 4910 Corporate Dr. Suite C | Huntsville | AL | 35805 | 800-850-9048 | USA | Wireline | |
| KMTC | A | KMTelecom | 18 2nd Ave NW | Kasson | MN | 55944-1448 | 507-634-2511 | MN | Facility | |
| KNGD | A | Kingdom Telephone Company | 211 S. Main | PO Box 97 | Auxvasse | MO | 65231 | 800-487-8211 | MO | ILEC |
| KNX | I | (Inactive) Knix Telecom | 300 Second Street | Farmville | VA | 23901 | 434-603-1295 | VA | CLEC | |
| KOFA | A | Knology of Georgia, Inc. | 3633 Wheeler Road | Augusta | GA | 30909 | 800-453-1777 | Augusta, GA | Facility | |
| KOFC | A | Knology of Columbus | 1241 O. G. Skinner Dr. | West Point | GA | 31833 | 800-453-1777 | Columbus, GA | Facility | |
| KOFCH | A | KNOLOGY of Charleston, Inc. | 1241 O. G. Skinner Dr. | Westpoint | GA | 31833 | 800-453-1777 | Charleston, SC | Facility | |
| KOFH | A | Knology of Alabama, Inc. | 1241 O. G. Skinner Dr. | Westpoint | GA | 31833 | 800-453-1777 | Huntsville, AL | Facility | |
| KOFK | A | Knology of Knoxville | 1241 O. G. Skinner Drive | Knoxville | TN | 37932 | 800-453-1777 | Knoxville, TN | Facility | |
| KOFM | A | Knology of Montgomery | 1241 O. G. Skinner Dr. | Westpoint | GA | 31833 | 800-453-1777 | Montgomery, AL | Facility | |
| KOFN | C | (Cancelled) Knology of Nashville, Inc. | 1241 O.G. Skinner Drive | West Point | GA | 31833 | 800-453-1777 | Nashville, TN | Facility | |
| KOFPC | A | KNOLOGY of Florida, Inc. | 1241 O. G. Skinner Dr. | Westpoint | GA | 31833 | 800-453-1777 | Panama City Beach, FL | Facility | |
| KOFPN | A | Knology of Florida, Inc. | 1241 O.G. Skinner Drive | West Point | GA | 31833 | 866-745-3685 | Pinellas County, FL | Facility | |
| KOYOT | C | (Cancelled) Koyote Telephone | 100 Kjngs Plaza Suite A | Commerce | TX | 75429 | 903-408-9746 | TX | Facility | |
| KPCI | A | Kingston Plantation Communications | Embassy Suites Hotel | 9800 Queensway Blvd | Myrtle Beach | SC | 29572 | 843-449-0006 | SC | PBX |
| KTC | A | Kaplan Teleophone Company | 118 N. Irving Ave. PO Box 369 | Kaplan | LA | 70548 | 337-643-1234 | LA | ILEC | |
| LAN | A | Local Access Network, LLC | dba Milaca Local Link | 2220 125th Street NW | Rice | MN | 56367-9701 | 320-393-4499 | MN | Facility |
| LATEL | A | Lafourche Telephone Co., Inc. | P.O. Box 188 112 West 10th Blvd. | Larose | LA | 70373 | 504-693-4567 | LA-Southern half of Lafourche Parish | LEC | |
| LBH | A | LBH, LLC dba Communications | 153 W. Dave Dugas Road | Sulphur | LA | 70664 | 800-737-3900 | LA | CLEC | |
| LBL | C | (Cancelled) Berkeley National Laboratory | 1 Cyclotron Rd. Building 69 | Centrail Receiving, PO#317784 | Berkeley | CA | 94720-7300 | 510-486-4777 | CA | PBX |
| LCCTX | A | Lamar County Cellular | 3940 Lamar Ave. | Paris | TX | 75460 | 800-332-3471 | Lamar County | WSP | |
| LCITR | A | Lakefield Communications, Inc. | 7520 English Lake Rd. | Newton | WI | 53063 | 920-758-2211 | WI | CLEC | |
| LCM | A | Lutheran Social Ministries at Crane’s Mill | 459 Passaic Avenue | West Caldwell | NJ | 07006 | 800/220-4900 | NJ | PBX | |
| LCT | A | Louisiana Competitive Telecommunications | 110 North Irving Ave. | Kaplan | LA | 70548-4913 | 337-643-1234 | LA | CLEC | |
| LDC | C | (Cancelled) LineDrive Communications | 4600 Emperor Blvd | Morrisville | NC | 27560 | 877-650-4532 | ALL | Facility | |
| LDLNK | A | Lakedale Link, Inc. | 9938 State Hwy 55 NW, PO Box 340 | Annandale | MN | 55302-0340 | 320-274-3111 | MN | Facility | |
| LDMI | A | LDMI Telecommunications | 27777 Franklin Road | Suite 500 | Southfield | MI | 48034 | 800-374-5364 | MI,OH | FAC, Resell |
| LEAD | C | (Cancelled) Letterkenny Army Depot | 1 Overcash Ave. | Bldg. 10, AMSAM-LE-DD-R | Chambersburg | PA | 17201 | 717-267-8800 | Letterkenny Army Depot – PA | PBX |
| LEAP | I | (Inactive) Leap Wireless International | 10307 Pacific Center Court | San Diego | CA | 92121 | 866-688-6058 | TN, GA, NC, AZ, NM, OH, CO, AR, UT, OK, KS, PA | Wireless | |
| LECMI | A | Local Exchange Carriers of Michigan | 3790 Rohr Rd. | Orion | MI | 48359 | 866-512-2126 | MI | Facility | |
| LEHBR | A | Lehman Brothers | 745 7th Ave., Network Engineering | New York | NY | 10019-6801 | 212-526-2900 | Lehman Brothers E911 PS ALI Service | PBX Cisco IP | |
| LEM | A | Laurens Municipal Broadband Comm. Utility | 272 No. 3rd | Laurens | IA | 50554 | 712-841-4610 | IA | Facility | |
| LEN | A | Lennon Telephone Company | 3095 S. Sheridan Road | PO Box 329 | Lennon | MI | 48449 | 810-621-3302 | Lennon, MI | Facility |
| LERU | I | (Inactive) Le-Ru Telephone Co. | 555 Carter St. | Stella | MO | 64867 | 417-628-6836 | MO | Facility | |
| LHRPE | A | La Harpe Telephone Company | 109 West 6th | PO Box 100 | La Harpe | KS | 66751 | 620-496-2291 | La Harpe, KS | ILEC |
| LHTC | A | Laurel Highland Telephone Co. | 4157 Main Street | PO Box 168 | Stahlstown | PA | 15687-0168 | 724-593-6666 | PA | Facility |
| LIB | C | (Cancelled) Liberty Cellular, Inc. dba Kansas | 621 Westport Blvd. | Salina | KS | 67401 | 316-386-9100 | All KS RSA’s | Cellular | |
| LIGO | A | Ligoner Telephone Company | 414 S. Cavin Street | Ligoner | IN | 46767 | 260-894-4104 | IN | ILEC | |
| LINCN | A | Lincoln Telephone Company | 111 Stemple Pass Road | Lincoln | MT | 59639 | 406-362-4216 | Lincoln, MT | Facility | |
| LIPAN | A | Lipan Telephone Company | 109 N. Kickapoo Street | PO Box 187 | Lipan | TX | 76462-0187 | 254-646-2211 | Lipan and Bluff Dale TX | Facility |
| LITE | C | (Cancelled) Litestream Technologies | 9155 S. Dadeland Blvd., Suite 1502 | Miami | FL | 33156 | 877-212-4744 | Tampa, FL, St. Augustine, FL | Facility | |
| LIVTC | A | Livingston Telephone Company | 701 W. Church | Livingston | TX | 77351 | 936-327-4620 | TX | Facility | |
| LKDLT | A | Lakedale Telephone Company | 9938 State Hwy 55 NW, P O Box 340 | Annandale | MN | 55302-0340 | 888-344-3730 | MN | Facility | |
| LKSDE | A | Lakeside Telephone Company | 730 Lake Washington Road – East Side | PO Box 236 | Glen Alan | MS | 38744 | 662-839-2671 | MS | Facility |
| LKTEL | A | Lakeland Telecom, Inc | 28 1st Avenue West | Luck | WI | 54853 | 715-472-2101 | WI | Reseller | |
| LLINE | A | Long Lines, Northwest Iowa Telephone Co. | 504 4th Street | Sergeant Bluff | IA | 51054 | 712-271-4000 | IA | Facility | |
| LLTC | A | Lake Livingston Telephone Company | 229 Stevens Lane | Livingston | TX | 77351 | 936-566-4165 | TX | Facility | |
| LNE | A | Lost Nation Elwood Telephone | 304 Long Avenue | P.O. Box 97 | Lost Nation | IA | 52254 | 563-678-2470 | Lost Nation, Elwood, Oxford Junction, IA | LEC |
| LNGO | A | Lingo, Inc. | 7901 Jones Branch Drive | Suite 900 | McLean | VA | 22102 | 866-901-0911 | USA | VoIP |
| LNSTR | C | (Cancelled) Lone Star Cellular, Inc dba Cellular | 519 W. Commerce Suite C | Brownwood | TX | 76801 | 915-646-3600 | TX | Cellular | |
| LOAX | C | (Cancelled) Log On America Inc. | 3 Regency Plaza | Providence | RI | 02903 | 888-456-2932 | RI | UNE | |
| LOCAL | A | Local Access Prime, LLC | 1417 Kresky Avenue, Ste. 1 | P.O. Box 683 | Centralia | WA | 98531 | 253-291-4638 | WA | Facility |
| LOGIX | A | Western Communications Inc. d/b/a Logix | 2950 N. Loop West | Suite 1200 | Houston | TX | 77092 | 877-564-4966 | OK, TX | CLEC |
| LORET | A | Loretel Systems, Inc. | 13 E. 4th AvenuePO Box 72 | PO Box 72 | Ada | MN | 56510 | 218-784-7000 | MN, ND | LEC |
| LOUCM | A | Louisa Communications | 28 Division Street | Monring Sun | IA | 52640 | 319-868-6720 | Wapello, IA | CLEC | |
| LOWE | A | Lowell National Historical Park | 400 Foot of John Street | Lowell | MA | 01852 | 978-970-5240 | MA | PBX | |
| LOYLA | A | Loyola College | 4501 N. Charles Street | Baltimore | MD | 21210 | 410-393-4672 | MD | PBX | |
| LPASO | A | El Paso County Telephone Company | 480 N. Peyton Highway | Colorado Springs | CO | 80930-9599 | 719-683-2501 | Portions of El Paso, Lincoln, Elbert and Pueblo Counties, CO | Facility | |
| LRHSD | A | Lenape Regional High School District | 93 Willow Grove Road | Shamong | NJ | 08088 | 609-868-7159 | NJ | Facility | |
| LRM | C | (Cancelled) LRM-Com, Inc. | 417 West Foothill Blvd. | Suite B | Glendoria | CA | 91741 | 800-844-1001 | CA, CO | Reseller |
| LST | C | (Cancelled) Lightsource Telecom | One Seagate, Suite 1160 | Toledo | OH | 43604 | 866-578-7560 | IL | Facility | |
| LTB | A | LightBound | 731 Henry Street | Suite 201 | Indianapolis | IN | 46225 | 800-844-8649 | IN | CLEC |
| LTC | A | Lancaster Telephone Company | 703 N. White St. | Lancaster | SC | 29721 | 803-326-7203 | SC | ILEC | |
| LTCI | A | Logan Telephone Cooperative, Inc. | 10725 Bowling Green Rd. | Auburn | KY | 42206 | 270-542-4800 | KY-portions of Logan, Butler, Todd, Simpson, Muhlenburg Co. | Facility | |
| LTCL | A | LaMotte Telephone Company | 400 Pine Street | P.O. Box 8 | LaMotte | IA | 52054-0008 | 563-773-2213 | Iowa | Facility |
| LTCTN | I | (Inactive) Loretto Telephone Company, Inc. | 136 South Main Street | Loretto | TN | 38469 | 931-853-6100 | Wayne, Lawrence, Giles Counties of TN | Facility | |
| LTDS | A | LTDS Corporation | 108 West Palm Drive, Suite 304 | Fairfield | IA | 52556 | 641-209-9175 | IA | Facility | |
| LTEL | A | Localtel Communications | 343 Grant Road | East Wenaatchee | WA | 98802 | 509-884-6291 | WA | Facility | |
| LTNTB | A | Lakefield Communications, Inc. | 7520 English Lake Rd. | Newton | WI | 53063 | 920-758-2211 | WI | ILEC | |
| LTPT | C | (Cancelled) Lightship Telecom LLC | 102 Perimeter Rd. | Nashua | NH | 03063 | 603-883-4477 | ME, NH | Facility | |
| LTSPD | A | Lightspeed Telecom LLC | 123 East Main Street | Floor 1 | Salem | IL | 62881 | 888-698-7222 | IL | Facility |
| LUCRE | A | Lucre, Inc. | 4011 Plainfield Ave NE | Grand Rapids | MI | 49525 | 616-260-5744 | MI | CLEC | |
| LUTEC | C | (Cancelled) Lucent Technologies | 600 Mountain Avenue | Murray Hill | NJ | 07974 | 908-582-3000 | all | 5ESS, PBX | |
| LUW | C | (Cancelled) Lec Unwired | One Lakeshore Drive | Lake Charles | LA | 70629 | 318-310-2000 | LA | CLEC | |
| LVL3 | A | Level3 Communications, LLC. | 1025 Eldorado Blvd | 34A-424 | Broomfield | CO | 80021 | 877-453-8353opt4 | US | Facility |
| LWCL | A | Lightwave Communications | 14504 Greenview Drive | Suite 302 | Laurel | MD | 20708 | 888-953-9300 | MD, DC, VA | Facility |
| LWK00 | C | (Cancelled) LightNetworks | B450 2700 NE Expressway Access Road | Atlanta | GA | 30345 | 404-320-3021 | GA | Facility | |
| LWN | A | Live Wire Networks, Inc. | 4577 Pecos Street | PO Box 11146 | Denver | CO | 80211-0146 | 303-510-1395 | CO | Facility |
| LWTEL | A | LaWard Telephone Exchange, Inc. | 12991 State Highway 172 | PO Box 246 | LaWard | TX | 77970 | 361-872-2211 | TX | Facility |
| LXCM | A | Lexcom Telephone Company | 200 North State Street | Lexington | NC | 27292 | 336-249-5817 | Lexcom Telephone Call Center | ILEC | |
| LYRIX | A | Iowa RSA 2 Limited Partnership dba LYRIX | 404 Howland St. | P.O. Box 90 | Emerson | IA | 51533 | 712-370-8080 | IA | Wireless |
| M1MW | A | Comcast Telecommunications of Mich. LLC | 38260 Executive Drive | Westland | MI | 48185 | 800-839-6707 | MI | Facility | |
| M1NE | C | (Cancelled) MediaOne Telecommunications of MA | 5800 South Quebec Street | 3rd Floor | Greenwood Village | CO | 80111 | 800-839-6707 | MA, NH | Facility |
| M1NE1 | C | (Cancelled) ComCast Comunication Inc. | 5800 South Quebec Street, 3rd Floor | Greenwood Village | CO | 80111 | 800-839-6707 | MA, NH | facility | |
| M1SE | A | Media One Florida Telecommunications | 5800 S. Quebec Street | 3rd Floor | Greenwood Village | CO | 80111 | 800-839-6707 | Jacksonville & Pompano Beach, FL, Richmond, VA, MN | Facility |
| MACAD | I | (Inactive) Mercersburg Academy | 300 E Seminary St | Mercersburg | PA | 17236-1551 | 717-267-6851 | Mercersburg Academy campus | PBX | |
| MADL | A | Christensen Communications Company | 104 West Main Street | Madelia | MN | 56062 | 507-642-3211 | Medelia, MN serving area | Facility | |
| MAINE | A | Maine Telephone Co. | 73 Main St. | Raymond | ME | 04071 | 888-889-9950 | Raymond, Naples, Casco, Poland | Facility | |
| MANS | A | Mansfield University | 210 Memorial Hall | 002 Straughn Drive | Mansfield | PA | 16933 | PBX | ||
| MAR | A | Marathon Communications Inc. | 2001 6th Avenue | Suite 1966 | Seattle | WA | 98121 | 800-398-8695 | WA,LATA 674 | Facility |
| MARGA | A | Margaretville Telephone Company, Inc. | 50 Swart Street | Margaretville | NY | 12455 | 845-586-3319 | NY | Facility | |
| MARSD | A | Matawan-Aberdeen Regional School District | One Crest Way | Aberdeen | NJ | 07747 | 732-673-8840 | Aberdeen & Matawan Townships | PBX | |
| MARTC | A | Marseilles Telephone Company | 244 Lincoln Street | Marseilles | IL | 61341-1900 | 815/795-5161 | IL | LEC | |
| MATC | A | Magazine Telephone Company | 25 Magtel Drive | Booneville | AR | 72927 | 501-969-2211 | Facaility | ||
| MATC4 | P | Marquette Adams Telephone Cooperative | 113 N Oxford Street | PO Box 45 | Oxford | WI | 53952 | 608-586-4111 | WI | Cable Digital, CLEC Facility, CLEC Reseller, Co-op/Rural ILEC, PBX/PS911/ |
| MATI | A | Mescalero Apache Telecom, Inc. | 226 Chiricahua Plaza | PO Box 229 | Mescalero | NM | 88340 | 505-464-4039 | All | Facility |
| MATOR | A | Mt. Angel Telephone Company | 155 N. Garfield St | PO Box 200 | Mt. Angel | OR | 97362 | 503-845-2291 | OR | Facility |
| MAWI | A | MAW Communications, Inc. | 421 Washington St., 1st Floor | Reading | PA | 19601 | 877-633-3629 | PA | Facility | |
| MAXCS | C | (Cancelled) Maxcess, Inc. | 100 W. Lucerne Circle, Suite 500 | Orlando | FL | 32801 | 407-513-7700 | FL | Facility | |
| MBO | A | MBO Wireless, Inc. | 1 West Main Street | Earlsboro | OK | 74840 | 800/828-6567 | OK | Wireless | |
| MBTEL | A | MEBTEL Communications | 202 E. Washington Street | Mebane | NC | 27302-0009 | 919-563-9111 | NC | Facility | |
| MCCK | A | McCook Cooperative Telephone Company | 330 S Nebraska St | Salem | SD | 57058 | 605-425-2238 | SD | Facility | |
| MCCOL | A | Montgomery College | 51 Mannakee Street | Rockville | MD | 20850 | 301-279-5111 | MD | PBX | |
| MCDSL | C | (Cancelled – see MCI) MCI | 2400 N. Glenville Drive | Mail Drop – McMillon D2126 | Richardson | TX | 75082 | 800-275-0014 | TX, MO, AK, KS, OK, IL, MI, OH, WI, IN, CT, CA, NV | Reseller |
| MCDTC | A | McDonald County Telephone Company | 704 N Main Street | HWY “”W”” | Pineville | MO | 64856-0207 | 417-223-4313 | McDonald County | Facility |
| MCG | A | Mahaska Communications Group | 100 1st Ave. West | P. O. Box 808 | Oskaloosa | IA | 52577 | 319-868-7636 | IA | Facility |
| MCI | I | (Inactive) MCI metro | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75802 | 800-844-1001 | USA | Facility |
| MCIW | C | (Cancelled – see MCI) MCI | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75082 | 800/844-1001 | US | Facility |
| MCLDA | A | McLeodUSA | 6400 C Street SW | PO Box 3177 | Cedar Rapids | IA | 52406-3177 | 800-332-2385 | IL | Facility |
| MCLDP | C | (Cancelled – see MCLDU) McLeodUSA Telecommunications | 6400 C Street SW | Cedar Rapids | IA | 52406 | 800-500-3003 | IL, MI, MN | PBX | |
| MCLDU | A | McLeod USA Telecommunications Services | 6400 C Street SW | Cedar Rapids | IA | 52406 | 800-332-2385 | AZ, CO, ID, IL, IN, IA, KS, MN, MO, NE, NM, ND, OR, SD | Facility | |
| MCLOU | A | McLoud Telephone Company | 402 East Broadway Avenue | McLoud | OK | 74851 | 405-202-0806 | OK | Facility | |
| MCNAB | A | McNabb Telephone Company | 308 West Main Street | PO Box 158 | McNabb | IL | 61335 | 815-882-2201 | IL | Facility |
| MCTC | C | (Cancelled) Mon-Cre Telephone Cooperative, Inc. | 227 Main Street | Ramer | AL | 36069 | 334-562-3513 | Cities: Montgomery, Crenshaw, Pike, Bullock | Reseller | |
| MCTC2 | A | Modern Cooperative Telephone Co. | 502 Broadway Street | PO Box 158 | South English | IA | 52335-0158 | 319/667-2375 | IA, Northern portion of Keokuk Co. | Facility |
| MCTCO | A | Mid Century Telephone Cooperative | 1055 West Locust Street | PO Box 479 | Canton | IL | 61520 | 309-778-8001 | IL | Facility |
| MCTEL | A | The McClure Telephone Company | 311 S. East Street | McClure | OH | 43534 | 419-748-8300 | OH | ILEC | |
| MDHC | A | Mid-Hudson Communications Inc. | 200 Jefferson Heights | Catskill | NY | 12414 | 518-694-8903 | NY | CLEC | |
| MDLB | A | The Middleburgh Telephone Company | 14 Cliff St | PO Box 191 | Middleburgh | NY | 12122-0191 | 518-827-5211 | NY | Facility |
| MEAU | A | Mitsubishi Electric Automation, Inc. | 500 Corporate Wods Parkway | Vernon Hills | IL | 60061 | 847-478-2100 | IL | Facility | |
| MEHTC | A | Marne & Elk Horn Telephone Company | 4242 Main Street | P.O. Box 120 | Elk Horn | IA | 51531-0120 | 712-764-6161 | IA | Independent |
| MERCO | A | Merrimac Communications, Ltd. | 327 Palisade Street | Merrimac | WI | 53561 | 608-493-9470 | WI | Facility | |
| MERRI | A | Merrimack College | 315 Turnpike St. | North Andover | MA | 01845 | 978-837-5000 | MA | PBX | |
| METCO | A | Metro Teleconnect Companies | 2150 Herr Street | Ist Floor | Harrisburg | PA | 17103 | 717-564-0603 | IL,KS,TX,MI | Reseller |
| METNY | I | (Inactive) TDS Telecom c/o Metrocom NY | 1 Curtis Rd | Vernon | NY | 13476 | 315-829-2211 | NY: Oneida | CLEC | |
| METRO | A | TDS Metrocom, Inc. | 525 Junction Toad, Suite 6000 | Madison | WI | 53717 | 888-790-1216 | WI, IL, MI | Facility | |
| METTC | A | Metamora Telephone Company | 220 N. Menard Street | PO Box 800 | Metamora | IL | 61548 | 309/367-4197 | IL | LEC |
| MFIVE | A | M5 Networks | 15 W 26TH Street | Floor 7 | New York | NY | 10010-1002 | 646-230-5001 | NY | PBX |
| MFP | I | (Inactive) Miller Fluid Power | 800 N. York Road | Bensenville | IL | 60106 | 800-844-1001 | IL | PBX | |
| MGA | A | Maryland General Assembly | 90 State Circle Rm B-14 | Annapolis | MD | 21401 | 410-946-5015 | MD | PBX | |
| MGC | A | Mpower Communications | 3300 N. Cimarron Road | Las Vegas | NV | 89129 | 888-636-2641 | CA, NV, IL, | Facility | |
| MGCMD | A | Montgomery County/ 9-1-1 ETC, Inc. | 19119 North Creek Pkwy | Ste 101 | Bothell | WA | 98011 | 800-773-7911 | MD | PBX |
| MGHC | C | (Cancelled) Masonicare | 22 Masonic Ave. | Wallingford | CT | 06492 | 203-284-3900 | Hospital | PBX | |
| MGSNT | OB | (Out of Business) MegsINet-CLEC, Inc. | 225 W. Ohio Suite 400 | Chicago | IL | 60610 | 312-470-9015 | IL | Facility | |
| MGTN | C | (Cancelled) Millington Telephone Co Inc | 4880 Navy Rd | Millington | TN | 38053 | 901-872-7777 | TN | ILEC | |
| MGW | C | (Cancelled) MGW Telephone | P.O. Box 105 Rt. 678 | Williamsville | VA | 24487 | 540-887-1031 | Augusta Co., VA | Facility | |
| MHNT | A | Metropolitan Communications | 44 Wall Street | Floor 6 | New York | NY | 10005 | 866-312-0911 | NY, NJ | Facility |
| MHO | A | MHO Networks | 1190 S. Colorado Blvd. | Denver | CO | 80246 | 720-323-5255 | CO | Reseller | |
| MHT | A | MH Telecom Inc | 305 N Iowa St | Dodgeville | WI | 53533 | 608-437-5323 | WI – Iowa County | Facility | |
| MHTC | A | Mt Horeb Telephone Company | 200 E Main St. | Mount Horeb | WI | 53572 | 608-437-5323 | WI – Dane, Iowa counties | Facility | |
| MID | A | Midstate Communications, Inc. | 120 E. 1st St. | P.O. Box 48 | Kimball | SD | 57355-0048 | 800-778-3373 | SD | Facility |
| MIDCO | A | Midcontinent Communications | 410 S Phillips Ave | Sioux Falls | SD | 57104 | 605-334-1200 | SD, ND | Facility | |
| MIDME | A | Mid-Maine Communication | 900-D Hammond Street | Bangor | ME | 04401 | 207-992-9931 | ME | Facility | |
| MIDTX | A | Mid-Tex Cellular LTD | 6100 Highway 16 | PO Box 349 | DeLeon | TX | 76444 | 325-647-9878 | TX | Facility |
| MILRY | A | Millry Telephone Co. | 209 HWY. 17 PO Box 45 | Millry | AL | 36558-0045 | 334-846-3209 | 9001 Southern Choctaaw County AL | Facility | |
| MITCH | A | Mitchell Telecom | 1801 North Main Street | Mitchell | SD | 57301 | 605-996-2525 | Mitchell, SD | Facility | |
| MKD | A | MoKan Dial, Inc. | 112 S. Broadway | PO Box 429 | Louisburg | KS | 66053-0429 | 913-837-2219 | KS | ILEC |
| MLBY | P | Mulberry Cooperative Telephone Company, Inc. | 123 S. Glick Street | PO Box 370 | Mulberry | IN | 46058-0370 | 765-586-0098 | IN | ILEC |
| MLHS | A | Main Line Health System Telecommunications Department | 130 S. Bryn Mawr Ave. | Bryn Mawr | PA | 19010 | 610-526-3000 | PA | PBX | |
| MLNM | C | (Cancelled) Millennium Telcom, LLC/ | 4700 Keller Hicks Rd. | Keller | TX | 76248 | 877-210-3007 | TX | Facility | |
| MLTC | A | Minnesota Lake Telephone Company | 208 Main Street North | Minnesota Lake | MN | 56068 | 507-526-3252 | MN | Facility | |
| MMPI | A | Merchandise Mart Properties | 222 Merchandise Mart Plaza | Chicago | IL | 60654 | 312-527-7700 | IL, NC, DC, NY | VoIP | |
| MNDRG | A | Moundridge Telephone Company | P. O. Box 960 | 109 N. Christian Ave. | Moundridge | KS | 67107 | 620-345-2831 | KS | Facility |
| MNET | I | (Inactive) MountaiNet Telephone Company | PO Box 488 | 121 Woodland Street | Gate City | VA | 24251 | 276/452-9117 | TN, VA | CLEC Facility |
| MNVL | A | Moundville Telephone Co. | 288 Market St. | PO Box 587 | Moundville | AL | 35474-0587 | 205-371-9011 | AL | Facility |
| MOBT | OB | (Out of Business) Mobiletel Inc. | P.O. Box 1090 | Larose | LA | 70373 | 504-693-4567 | LA | Cellular | |
| MOMA | A | Museum of Modern Art | 11 W 53rd | New York | NY | 10019 | 212-708-9467 | NY | PBX | |
| MONON | A | Monon Telephone Company, Inc. | PO Box 625 | 311 N Market Street | Monon | IN | 47959 | 219-253-8200 | Indiana, Portions of White, Jasper and Pulaski Counties | Exchange |
| MONTR | A | Monitor Cooperative Telephone Co. | 15265 Woodburn-Monitor Road NW | Woodburn | OR | 97074 | 503-634-3434 | OR | Facility | |
| MOORE | A | Moore Center Services, Inc. | 132 Titus Avenue | Manchester | NH | 03103 | 603-206-2772 | NH | PBX | |
| MOTEL | A | Missouri Telecom, Inc. | 515 East Cleveland, Suite C | Monett | MO | 65708 | 417-235-0111 | MO | Facility | |
| MOUND | P | Mound Bayou Company | 113 S. East Main Avenue | Mound Bayou | MS | 38762 | 662-741-2559 | Mound Bayou, MS | ILEC | |
| MOVPR | A | NewComm Wireless | City View Plaza 700 | Guaynabo | PR | 00968 | 787-620-2320 | PR | ||
| MPIRE | A | Empire One Telecommunications | 55 Washington Street | 9th Floor | Brooklyn | NY | 11201 | 917-553-7285 | NY, NJ, PA, CT, MA | Facility |
| MPRTC | A | Mid-Plains Rural Telepohone Coop, Inc | 411 N Hale St | Tulia | TX | 79088 | 806-995-3572 | TX | Facility | |
| MPT | A | Mid-Plains Telecommunications Co. | PO Box 620070 | Middleton | WI | 53562 | 608-831-5858 | Middleton, Cross Plains, West side of Madison | Facility | |
| MPTC | A | Medicine Park Telephone Co. | #1 Big Rock Blvd. | Medicine Park | OK | 73557 | 580-529-5200 | Medicine Park, OK | ILEC | |
| MQD | OB | (Cancelled – Out of Business) MercedNet, Inc | 450 West 18th Street | Merced | CA | 95341-0071 | 209-386-0876 | CA | Facility | |
| MQN | A | Mapleton Communications | 513 Main St. | Mapleton | IA | 51034 | 712-882-1351 | IA | Facility | |
| MRCI | A | Madison River Communications | 103 South Fifth Street | Mebane | NC | 27302 | 877/249-1841 | All | Facility | |
| MRTC | A | Mid-Rivers Telephone Co-op. Inc. | 904 C Avenue | PO BOX 280 | Circle | MT | 59215 | 406-687-3391 | MT | Telco, CLEC |
| MRTEL | A | Gulf Coast Wireless | 9800 Airline Hwy | Suite 210 | Baton Rouge | LA | 70816 | 225-408-7233 | LA, MS | Wireless |
| MSHTC | C | (Cancelled) Marianna Scenery Hill Telephone Co. | 17 Magnolia Ave. | Marianna | PA | 15345-0308 | 724-267-3333 | PA | Facility | |
| MSLLC | A | Mainstreet Communications, LLC | 831 Main Street South | SaukCentre | MN | 56378 | 320-351-1460 | MN | Facility | |
| MSTCM | A | Metrostat Communications | 60 Schulman Street | Sylva | NC | 28779 | 800-624-7481 | NC | Facility | |
| MTA | A | Matanuska Telephone Association, Inc. | 1740 S. Chugach Street | Palmer | AK | 99645 | 907-761-2101 | AK | Facility | |
| MTAI | A | Midwest Telecom of America, Inc. | 1567 E. 93rd Avenue | Merrillville | IN | 46410 | 219-650-5555 | NW IN | Facility | |
| MTAW | A | Matanuska-Kenai, Inc. dba MTA Wireless | 701 E Parks Hwy | Ste 100 | Wasilla | AK | 99654 | 907-373-2355 | AK | Wireless |
| MTC | A | Melrose Telephone Company | 224 East Main Street | PO Box 100 | Melrose | MN | 56352 | 320-256-7471 | MN | Facilities |
| MTCIL | A | Madison Telephone Company | 118 East State Street, PO Box 158 | Hamel | IL | 62046 | 618-633-2267 | IL | LEC | |
| MTE | A | Midvale Telephone Exchange, Inc. | PO Box 7 | 2205 Keithley Creek Rd. | Midvale | ID | 83645 | 208/355-2211 | ID, OR, AZ, WA | Facility |
| MTECB | A | City of Baltimore – MTE | 201 E. Baltimore Street | Suite 1100 | Baltimore | MD | 21202 | 410-396-3100 | MD | PBX |
| MTEL | A | MichTel Communications, LLC | 10 West Huron Street | Pontiac | MI | 48342 | 248-335-1450 | MI | Facility | |
| MTI | A | Mountain Telecommunications, Inc. | 10190 E. Mekellips Rd. | Scottsdale | AZ | 85256 | 480/850-9555 | AZ | Facilities | |
| MTPCS | A | MTPCS LLC | 1211 NW Bypass | Great Falls | MT | 59405 | 888-727-3993 | MT | Wireless | |
| MTPD | A | Mohegan Tribal Police | 49 Sandy Desert Road | Uncasville | CT | 06382 | 860/862-7460 | Reservation of Mohegan Tribe of Indians of CT | PBX | |
| MTSCB | C | (Cancelled) Advantex Communications | 7701 S. Stemmons Fwy, Suite 210 | Corinth | TX | 76210 | 800-236-1076 | TX | Facility | |
| MTT | A | Monmouth Telephone & Telegraph, Inc. | 10 West Bergen Place, Suite 110 | Red Bank | NJ | 07701-1500 | 888-875-1747 | NJ | Facility | |
| MUPA | A | Millersville University of PA | 37 W. Frederick Street | PO Box 1002 Boyer Building | Millersville | PA | 17551-0302 | 717/872-3010 | University Campus | PBX |
| MUTAL | A | Mutual Telephone Company | 345 Main St. | Little River | KS | 67457 | 620-897-6200 | Little River, KS | Facility | |
| MVCI | A | Missouri Valley Communications, Inc. | P. O. Box 600 | 61 Hwy 13 S. | Scobey | MT | 59263-0600 | 406-783-5654 | Williston, ND | Telco |
| MVNU | A | Mount Vernon Nazarene University | 800 Martinburg Road | Mount Vernon | OH | 43050 | 740-392-6868 | OH | PBX | |
| MVU | A | Manning Municipal Communications(MMCTSU) | 719 Third Street | PO Box 386 | Manning | IA | 51455 | 712/655-3214 | IA | Facility |
| MWH | A | Midwest Wireless | 2000 Technology Drive | Mankato | MN | 56001 | 507-385-2440 | MN, IA, WI | Wireless | |
| MWHV | A | Midwest Wireless Holdings LLC | PO Box 4069 | 2000 Technology Drive | Mankato | MN | 56001-4069 | 507-317-6622 | MN, WI, IA | VoIP |
| NAMT | P | North American Telecom | 305 S Andrews Ave | 9th Floor | Fort Lauderdale | FL | 33301 | 877-433-6662 | FL, GA, AL | CLEC Facility, CLEC Reseller, CLEC UNE VoIP, VoIP Reseller |
| NARA | C | (Cancelled) National Archives And Records | 8601 Adelphi Rd. | College Park | MD | 20740-6001 | 301-837-2000 | MD | PBX | |
| NASD | C | (Cancelled) NASD | 9509 Key West Ave. | Rockville | MD | 20850 | 240/386-5275 | Rockville, MD | PBX | |
| NASDQ | C | (Cancelled) NASDAQ | 9513 Key West Blvd. | Rockville | MD | 20850 | 301-978-5310 | Rockville, MD | PBX | |
| NASDR | C | (Cancelled) NASDR, Inc. | 260 Franklin Street-#1600 | Boston | MA | 02110 | 240/386-6011 | MA | PBX | |
| NATAS | C | (Cancelled) National Academy Sciences | 2001 Wisconsin Avenue NW | Washington | DC | 20007 | 202/334-3434 | Washington, DC | Faciltiy | |
| NATC | C | (Cancelled) North American Telecom. Corp. | 1979 Marcus Ave., Ste. 200 | New Hyde Park | NY | 11042 | 888-262-2516 | NY, FL | Facility | |
| NATE | P | North American Telecom | 4 West Olas Blvd. | 9th Floor | Fort Lauderdale | FL | 33331 | 954-449-8000 | FL | CLEC Facility |
| NATEL | C | (Cancelled) National Tel | 6363 NW 6th Way, Suite 1000 | Fort Lauderdale | FL | 33309 | 800-555-5585 | USA | CLEC | |
| NAVTL | A | Navigator Telecommunications, LLC. | 212 Center St. Suite 500 | Little Rock | AR | 72201 | 888-562-8835 | MO, OK, SC, CA, AR, TX, KC, KY, FL, MI, NC, TN, GA | Facility | |
| NB911 | A | Nevada Bell | 645 East Plumb Lane | Reno | NV | 89502 | 916-977-7777 | NV | Facility | |
| NBAYD | C | (Cancelled) Pacific Bell/Eschelon Telecom of NV | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 916-977-7777 | NV | UNE | |
| NBAYN | C | (Cancelled) Nevada Bell/CAT Comm International | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0041 | CA,NV | UNE | |
| NBBGP | C | (Cancelled) SBC Nevada/Budget Phone, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE | |
| NBCSC | C | (Cancelled) Nevada Bell/Comm S. Companies, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA, NV | UNE | |
| NBEXL | C | (Cancelled) Nevada Bell/Excel Tele, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE | |
| NBLOA | C | (Cancelled) SBC Nevada/ AT&T | 3707 Kings Way | ROOM C33 | Sacramento | CA | 95823 | 800-275-0041 | CA, NV | UNE |
| NBMRB | C | (Cancelled) Nevada Bell/Camarato Distributing | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE | |
| NBNWF | C | (Cancelled) SBC Nevada / New Access Comm., LLC | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE |
| NBPFV | C | (Cancelled) Nevada Bell/Preferred Carrier Servc | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE | |
| NBPNJ | C | (Cancelled) SBC Nevada / PCS1 | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA, NV | UNE | |
| NBTVN | C | (Cancelled) Pacific Bell / Talk America | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 916-977-7777 | NV | UNE | |
| NBUTC | C | (Cancelled) Pacific Bell / Sprint | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 916-977-7777 | NV | UNE | |
| NBVRT | C | (Cancelled) Nevada Bell/VarTec Telecom | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0041 | CA, NV | UNE | |
| NBWUA | C | (Cancelled) Nevada Bell/MCI Metro | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA,NV | UNE | |
| NCC | A | Northwest Communications Cooperative | 111 Railroad Ave | PO Box 38 | Ray | ND | 58849 | 701-568-3331 | ND | Telephone |
| NCI | A | Norfolk County Internet, Inc. | Unit 12A Depot St. 13-25 Main Street | Franklin | MA | 02038 | 800-360-4010 | MA | Facility | |
| NCLEC | C | (Cancelled) NECLEC, LLC | 190 Old Derby | Hingham | MA | 02043 | 781-740-4144 | MA, RI, NY, NH | Facility | |
| NCPCS | C | (Cancelled) Northcoast PCS | 80 Baylis Road | Suite 201 | Melville | NY | 11747 | xxx-xxx-xxxx | CT, NJ, NY | Wireless |
| NCT | A | North Central Telephone Cooperative | PO Box 70 | 872 E Highway 52 Bypass | Lafayette | TN | 37083 | 615-666-2155 | TN | Facility |
| NCTC | C | (Cancelled) Nebraska Central Telephone Company | 22 Labarre | PO Box 700 | Gibbon | NE | 68840 | 308/468-6248 | NE | Telephone Company |
| NDGTL | A | Indigital Telecom | 5312 West Washington Center Rd | Fort Wayne | IN | 46818 | 877-469-2010 | IN | Facility | |
| NDNC | A | North Dakota Network Company | 3615 North Broadway | PO Box 2027 | Minot | ND | 58703 | 701-838-9755 | ND | PCC |
| NEBCO | OB | (Out of Business-see NENTC) NebCom, Inc. | 110 East Elk Street | P.O. Box 66 | Jackson | NE | 68743 | 877-617-6411 | NE | ILEC |
| NECCI | A | Cellular One of Northeast Colorado | 1224 West Platte Ave. | Fort Morgan | CO | 80701 | 970-768-6001 | CO Counties: Morgan, Logan, Sedgwick, Phillips, Washington, | Cellular | |
| NEFTC | A | Northeast Florida Telephone Company, Inc | 130 North 4th St. | Macclenny | FL | 32063 | 904-275-4150 | Baker Co., FL | Local Exch | |
| NEHP | A | New Hope Telephone Cooperative, Inc. | 5381 Main Drive | New Hope | AL | 35760 | 256-723-4219 | AL | Facility | |
| NELA | A | Northeast Louisiana Telephone Co, Inc. | 6402 Howell Ave | Collinston | LA | 71229 | 318-874-7011 | LA | Facility | |
| NELSN | A | Nelson Telephone Cooperative | 318 3rd Ave. West | Durand | WI | 54736 | 715-672-4204 | WI | Telephone | |
| NENTC | A | Northeast Nebraska Tele. Co. | PO Box 66 | 110 East Elk Street | Jackson | NE | 68743 | 877/617-6411 | NE | ILEC |
| NENTT | A | Nebraska Technology & Telecommunications | 809 N. 96th Street | Suite 210 | Omaha | NE | 68114 | 877-537-4403 | NE | Reseller |
| NEP | A | North-Eastern Pennsylvania Tele. Co. | 720 Main Street PO Box D | Forest City | PA | 18421 | 717-785-3116 | Lackawanna, Wayne, and Susquehanna Counties, PA | Telephone | |
| NET | A | Northeast Telephone Company | 122 South St. Augustine Street | PO Box 860 | Pulaski | WI | 54162 | 920-822-3697 | WI | Facility |
| Net2K | OB | (Out of Business) Net2000 Communications | 2180 Fox Mill Rd. | Suite 500 | Herndon | VA | 20717 | 888-786-3900 | VA, MD, DC, NJ, NY, PA | Facility |
| NETC | A | North English Coop Telephone Company | PO Box 246 | 105 West Oak Street | North English | IA | 52316 | 319/664-3821 | IA | ILEC |
| NETCA | A | NetCarrier Telecomm Inc | 4000 N. Cannon Ave | Lansdale | PA | 19446 | 215-257-4917 | PA, NJ, DE, NY | CLEC | |
| NETFO | C | (Cancelled) NetFone | 3300 Douglas Blvd. Ste 450 | Roseville | CA | 95611 | 916-780-0707 | CA | Resale PBX & Facilities | |
| NETI | I | (Inactive) Northeast Telecom, Inc. | 107 Contempo Ave.107 Contempo Ave. | West Monroe | LA | 71291 | 318-282-0188 | AR, LA, MS | Facility | |
| NETLE | A | Net Lec, LLC | PO Box 19079 | Green Bay | WI | 54307-9079 | 877-463-8532 | WI | CLEC | |
| NEVD | A | Conversent Communications, LLC | 313 Boston Post Rd. West | Marlboro | MA | 01752 | 508-486-6368 | MA, RI, NH | Facility | |
| NEW | I | (Inactive) New Age Clothing | 17545 Amantha Ave. | Carson | CA | 90746 | 310-632-8512 | CA | Reseller | |
| NEWCE | C | (Cancelled- See NSIGH) New-Cell | 450 Security Blvd. | PO Box 19079 | Green Bay | WI | 54307 | 920/617-0065 | WI, IA | Wireless |
| NEXGN | A | NexGen Integrated Communications, LLC | 3611 109th Street | Urbandale | IA | 50322 | 515-202-6789 | IA | Facility | |
| NEXT | A | Nextera Communications, LLC | 517 NW 4th Street | Brainerd | MN | 56401 | 218-818-9989 | MN | Facility | |
| NFR | A | New Frontiers Telecommunications | 49 Summit Ave. | 1st Floor | Hagerstown | MD | 21740 | 301-791-3800 | MD | Facility |
| NGT | A | New Global Telecom, Inc. | 600 12th Street | Suite 200 | Golden | CO | 80401 | 303-239-1056 | All | VoIP S.P. |
| NHLM | A | Nehalem Telephone | 35790 7th Street | Nehalem | OR | 97131 | 503-368-8123 | North Tillamook County | Facility | |
| NHO | A | Concho Cellular Telephone dba CellularOne | 2125 Sidney Baker | Kerrville | TX | 78028 | 830-258-8700 | TX | Wireless | |
| NHTC | A | New Hope Telephone CO. | 549 Battlefield Rd. | New Hope | VA | 24469 | 540-363-5277 | VA | Telco | |
| NIS | A | Networked Information Systems, LLC | 6A Gill Street | Woburn | MA | 01801 | 781-638-2200 | MA | PBX | |
| NITC | A | Northern Iowa Telephone Company | 339 1st NE | PO Box 200 | Sioux Center | IA | 51250 | 712-722-3451 | IA, MN | Facility |
| NITCO | A | Northwestern Indiana Telephone Co. | 205 N. Washington St.205 N. Washington Str. | P. O. Box 67 | Hebron | IN | 46341 | 219-996-2985 | NW IN | LEC |
| NLG | A | National Life Group | 1 National Life Group Drive | Montpelier | VT | 05604 | 802-229-3333 | VT | Facility | |
| NLIL | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| NLN | A | Nationsline, Inc. | 3435 Chip Drive NE | Roanoke | VA | 24012 | 540-312-9043 | All | Facility | |
| NLPAP | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| NLTC | A | New Lisbon Telephone Company | 6375 East Dublin Pike | New Lisbon | IN | 47366 | 765-332-2413 | IN: New Lisbon, Straughn | End Office | |
| NMC | A | National Mobile Communications, Corp. | 276 East Allen St. Suite 2 | Winooski | VT | 05404 | 802-371-7440 | VT | Facility | |
| NMH | I | (Inactive) Northfield Mount Hermon School | 206 Main Street | Northfield | MA | 01360 | 413-498-3400 | MA | PBX | |
| NMTCO | A | Western New Mexico Telephone Co. | 580 Hwy. 211 | P.O. Box 150 | Cliff | NM | 88028 | 800-535-0611 | Intrado | Facility |
| NMTEL | A | Nemont Telephone Cooperative, Inc. | 61 Highway 13 S | PO Box 600 | Scobey | MT | 59263 | 406-783-2200 | MT | Facility |
| NNJ | A | Nationsline of New Jersey | 3435 Chip Drive NE | Roanoke | VA | 24012 | 540-444-2125 | NJ | Facillity | |
| NNTC | A | Nucla-Naturita Telephone Company | 421 Main Street | NUCLA | CO | 81424 | 970-864-7335 | CO | Facility | |
| NORF | A | City of Norfolk, Virginia | 401 Monticello Ave | Ste 300 | Norfolk | VA | 23510 | 757-664-4512 | City of Norfolk Municipal buildings | PBX |
| NORTH | A | Northland Networks | 258 Genesee Street | Utica | NY | 13502 | 315-624-2000 | NY Counties – Madison, Jefferson, Onodaga, Oswego, Tomkins, | Facility | |
| NORTX | C | (Cancelled) Nortex Telcom, L.L.C. | 205 North Walnut St | Muenster | TX | 76252 | 940-759-4646 | Denton County TX | Facility | |
| NOVUS | A | Novus Communications | 4409 Sun N Lakes Blvd., Ste. F | Sebring | FL | 33872 | 863/471-1183 | FL | Facility | |
| NOXMS | A | Noxapater Telephone Company, Inc. | Front Street | Noxapater | MS | 39346 | 662-724-2192 | Noxapater, MS | Facility | |
| NPENN | C | (Cancelled) North Penn Telephone Company | 34 Main St PO Box 349 | Prattsburgh | NY | 14873-0349 | 607-522-3747 | PA | Facility | |
| NPI | C | (Cancelled) NPI – Omnipoint Wireless, LLC | 8089 South Avenue | Boardman | OH | 44512 | 231-932-2302 | Michigan | Wireless | |
| NPT | A | North Pittsburgh Telephone Company | 4008 Gibsonia Rd. | Gibsonia | PA | 15044-9311 | 800-472-0035 | Allegheny, Armstrong, Butler & Westmoreland Counties, PA | Facility | |
| NPTCO | C | (Cancelled) North Penn Telephone Co. | 34 Main St. PO Box 349 | Prattsburgh | NY | 14873-0349 | 607-522-3784 | Bradford & Tioga Counties, PA | Facility | |
| NRCST | A | Norcast Communications | 1998 Santa Barbara St, Ste. 100 | San Luis Obsipo | CA | 93401 | 805/544-2191 | CA | Facility | |
| NRTC | A | North River Telephone Cooperative | 147 Dinkle Ave. | Mt. Crawford | VA | 22841 | 540-350-2700 | Augusta Coutny VA | Carrier | |
| NRZ | A | Newroads Telecom | 310 Towson Avenue | Fort Smith | AR | 72901 | 866-278-0273 | AR | CLEC | |
| NSC | C | (Cancelled) NewSouth Communications Corp. | 2 North Main Street | Greenville | SC | 29601 | 800-600-5050 | SC | Facility | |
| NSCC | A | North State Communications Company | 111 N. Main St. | High Point | NC | 27260 | 336-886-3900 | High Point, Thomasville, Jamestown, Randleman, & other porti | Facility | |
| NSIGH | A | Nsight Teleservices | 450 Security Blvd. | Green Bay | WI | 54307-9079 | 920-339-4000 | WI, IA, MN, MI, IL, SD, ND | Wireless | |
| NSTAR | A | Northstar Access LLC | 440 Eagle Rd. | Big Lake | MN | 55309 | 800-433-5245 | MN | Facility | |
| NTBS | A | National Telecom & Broadband | 2400 E. Commercial Blvd. | Suite 720 | Fort Lauderdale | FL | 33308 | 954-616-5617 | FL | Facility |
| NTC | C | (Cancelled) NTC Communications, LLC | 961 Acorn Dr | Harrisonburgh | VA | 22802 | 540-437-4201 | VA, NC, MS | PBX | |
| NTCI | A | Northern Telephone Cooperative, Inc. | 121 First Street North | Box 190 | Sunburst | MT | 59482 | 406-937-2114 | MT | LEC |
| NTD | A | Northern Telephone and Data Corp. | 2129 Jackson Street | Oshkosh | WI | 54901 | 800/709-1818 | WI | Facility Reseller | |
| NTI | C | (Cancelled) Northwest Telephone, Inc. | 1639 N. Wenatchee Ave., Suite 9 | Wenatchee | WA | 98801 | 509-661-2345 | WA, OR, ID | CLEC | |
| NTLO | A | NTELOS | 401 Spring Lane | Waynesboro | VA | 22980 | 540-941-4800 | VA,WV,KY,NC,OH,PA,MD | Integrated | |
| NTOP | A | Net2Phone | 520 Broad Street | Eighth Floor | Newark | NJ | 07102 | 973-438-3555 | All | IP-Enabled |
| NTSC | A | NTS X Communications, Inc. | 5307 West Loop 289 | Lubbock | TX | 79414-1610 | 800-658-2101 | TX | Facility | |
| NTT | A | North Texas Telephone Co., Inc. | 519 Main Street | Byers | TX | 76357 | 940-733-1955 | TX | Facility | |
| NTTEC | A | National Telephone of Alabama, Inc. | 1309 Louisville Avenue | Monroe | LA | 71201 | 256-359-4330 | AL | ILEC | |
| NTWKS | A | Nex-Tech Wireless, LLC | 3001 New Way | Building #1 | Hays | KS | 67601 | 785-621-2666 | KS | PCS |
| NTWRK | C | (Cancelled) Network Associates | 3965 Freedom Circle | Santa Clara | CA | 95051 | 925-951-2761 | CA | PBX | |
| NTX | A | Nortex Communications Co. | 205 N. Walnut Street | Muenster | TX | 76252 | 940-759-2251 | Cooke & Montague Counties, TX | Facility | |
| NUR | C | (Cancelled – see OMH) Northwest Rural Electric Coop | 100 Central Avenue | LeMars | IA | 51031 | 712/500-4149 | IA | Facility | |
| NUT | A | New Ulm Telecom, Inc. | 400 2nd Street North | New Ulm | MN | 56073-0697 | 507/354-4111 | Redwood Falls, MN | Facility | |
| NUVIO | P | Nuvio Corporation | 8400 W. 110th Street | Suite 450 | Overland Park | KS | 66210 | 816-444-4422 | MA, NY, NJ, CT, PA, DE, GA, FL, DC, VA, MD, TX, MI, MN, WA, | VoIP |
| NUVOX | A | NuVox Communications | 301 N Main St | Suite 7000 | Greenville | SC | 29601 | 800-236-7284 | AK, FL, GA, IL, IN, KY, KS, LA, MO, MS, NC, OH, OK, SC, TX | Facility |
| NVAYD | C | (Cancelled)Nevada Bell / Eschelon Telecom of NV | 8925 Orangethorpe Ave. | Room 153 | Buena Park | CA | 90621 | 916-977-7777 | NV | UNE |
| NVC | A | Northern Valley Communications, LLC | P.O. Box 320 | Groton | SD | 57445 | 605-279-8430 | SD | Facility | |
| NVTL | A | Nevada Telephone, Inc. | 1700 S. Main St. | Las Vegas | NV | 89104 | 702-234-5300 | NV | Facility | |
| NVUNE | A | SBC Nevada | 3707 Kings Way | Room C33 | Sacramento | CA | 95821 | 800-275-0014 | NV | UNE P |
| NWFL | A | New Florence Telephone | 101 N. Main Street | PO Box 175 | New Florence | MO | 63363 | 573-835-2997 | MO | Facility |
| NWKTL | C | (Cancelled) Network Telephone Corporation | 815 South Palafox St. | Pensacola | FL | 32501 | 888-432-4855 | AL, FL, GA, KY, LA, MS, NC, SC, TN | Facility | |
| NWLCC | A | Edge Wireless, LLC | 650 SW Columbia | Suite 7200 | Bend | OR | 97702 | 541-312-5034 | CA, ID, OR, WY | Wireless |
| NWMC | A | Northwest Missouri Cellular | 1114A South Main | PO Box 551 | Maryville | MO | 64468 | 660-582-3334 | MO | Wireless |
| NWOH | A | First Communications, LLC | 3340 W. Market Street | Akron | OH | 44333 | 330/835-2323 | Akron, OH | Facility | |
| NWP | A | Broadview NP Acquisition Corporation | 59 Maiden Lane, 27th Floor | NY | NY | 11138 | 800-285-3170 | MA, RI, CT, NH, NY, PA, NJ | Facility | |
| NWPR | C | (Cancelled) New Paris Telephone | 19079 E. Market Street | New Paris | IN | 46553 | 574-831-3352 | IN | ILEC | |
| NXGEN | A | NEXTGEN Communications, LLC | 234 East Oak Street | Glenwood City | WI | 54013 | 715-265-7743 | Glenwood City, WI | Facility | |
| NXGT | A | NextGen Telephone | 28 North Country Rd. | Mount Sinai | NY | 11766 | 631-761-8040 | NY | Facility | |
| NXLAZ | C | (Cancelled See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXLCO | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXLKU | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| NXLMI | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXLNV | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| nxlnv | C | (Cancelled) Eagle Communications, Inc. | 60 East 56th Street | New York | NY | 10022 | 917-854-7600 | USA | Facility | |
| NXLNY | C | (Cancelled See XO) )XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXLOH | C | (Cancelled See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| NXLSP | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXLTX | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| NXTCA | C | (Cancelled See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXTFL | C | (Cancelled See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXTL | A | Nextel Communications | 2001 Edmund Halley Drive | Reston | VA | 20191 | 703/433-4398 | All | Wireless | |
| NXTLK | C | (Cancelled-See XO) XO Communications, Formerly NEXTLINK | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | All | Facility | |
| NXTLP | C | (Cancelled) Nextel Partners, Inc. | 4500 Carillon Point | 5th floor | Kirkland | WA | 98033 | ALL | Wireless | |
| NXTP | I | (Inactive) Nextel Partners Inc. | 4500 Carillon Point | Kirkland | WA | 98033 | 888/566-5398 | ALL | Wireless | |
| NYOCA | A | New York Office of Court Administration | 25 Beaver Street | Room 940 | New York | NY | 10004 | |||
| NYOFT | A | New York State Office for Technology | Empire State Plaza | Concourse, Rm 120 | Albany | NY | 12242-0062 | 518-890-8888 | NY | PBX |
| NYOGS | C | (Cancelled) NY State Office of General Services | Empire State Plaza | Concourse, Room 120 | Albany | NY | 12242 | 518/343-9212 | NY | PBX |
| NYPD | A | New York Police Department | 1 Police Plaza | New York | NY | 10038 | 212/374-5545 | Company PBX | PBX | |
| NYSA | A | New York State Assembly | 1 Enterprise Drive, RM 233 | Albany | NY | 12248 | 518/455-3949 | NY | PBX | |
| NYSS | A | New York State Senate | Legislative Office Building | Albany | OH | 12247 | 518/455-2810 | NY | PBX | |
| OAKHA | A | Primedia, Inc. / Oak Hill Apartments | 6601 Oak Hill Circle | Rensselaer | NY | 12144 | 800-829-0420 | NY | PBX | |
| OBVA | A | OpenBand of Virginia | 14927 Bogle Drive | Chantilly | VA | 20151 | 703/961-1110 | VA | Fac/Res | |
| OCG | C | (Cancelled) Omniplex Communications Group, LLC | 17 Research Park Dr. | Saint Charles | MO | 63304 | 888-666-4753 | MO, KS | Facility | |
| OCI | C | (Cancelled) McLeodUSA | 6400 C Street SW | Cedar Rapids | IA | 52404 | 612-252-5500 | MN, IL, WI, MI | Facility | |
| OCRT | C | (Cancelled) Oneida County Telephone | 9560 Main St | Holland Patent | NY | 13354 | 315-865-5201 | Holland Patent & Westernville | ILEC | |
| OCY | A | Orange City Communications | 1503 Albany Place SE | Orange City | IA | 51041 | 712/707-1000 | IA | Facility | |
| OEH | OB | (Out of Business) Avista Communications | 118 N. Stevens | Spokane | WA | 99201 | 800-771-6949 | MT, ID, WA | Facility | |
| OEY | A | OneEighty Communications | 206 N. 29th | Billings | MT | 59101 | 406/294-4000 | Billings and Bozeman, MT | Facility | |
| OGDEN | A | Ogden Telephone Company | 113 S.W. 3rd Street | Ogden | IA | 50212 | 515/175-2050 | IA | Facility | |
| OGT | A | Integra Telecom of Oregon | 1201 Loyd Blvd | Suite 500 | Portland | OR | 97232 | 877-679-9432 | OR, WA, UT, MN | CLEC |
| OGTCO | C | (Cancelled) Integra Telecom of Colorado | 10000 East Geddes Ave | Englewood | CO | 80112 | 720-325-1000 | CO | Facility | |
| OGTMN | C | (Cancelled – See OGT) Integra Telecom of Minnesota – North | 651 Edgewood Dr. N | Baxter | MN | 56425 | 503-748-2020 | MN – North | CLEC | |
| OGTMP | C | (Cancelled – See OGT) Integra Telecom of Minnesota | 4690 Colorado Street | Prior Lake | MN | 55372 | 877-679-9432 | MN – Scott and Rice County | ILEC | |
| OGTMS | C | (Cancelled – See OGT) Integra Telecom of Minnesota | 1201 N.W. Lloyd Blvd. | Suite 500 | Portland | OR | 97232 | 877-679-9432 | MN – Metro Area | CLEC |
| OGTUT | C | (Cancelled – See OGT) Integra Telecom of Utah | 3676 California Ave Suite B105 | Salt Lake City | UT | 84104 | 877-679-9432 | UT | CLEC | |
| OGTWA | C | (Cancelled – See OGT) Integra Telecom of Washington | 20435 72nd Ave South Suite 150 | Kent | WA | 98032 | 877-679-9432 | UT | CLEC | |
| OHI | A | Optimum Health Institute | 6970 Central Ave. | Lemon Grove | CA | 91945 | 800/829-1011 | CA | PBX | |
| OHLVD | A | Lima City School District | 515 S. Calumet Avenue | Earl A. McGovern Educational Center | Lima | OH | 45804 | 419-549-7540 | OH | PBX |
| OHM | A | Ohio Telecom Inc | 125 Maple St | Suite B | Port Clinton | OH | 43452 | 419-734-6037 | OH | Facility |
| OIA | A | CommChoice | 501 Fourth Street | PO Box 67 | Sergeant Bluff | IA | 51054 | 712/271-2710 | IA | Facility |
| OIIL | A | Owens-Brockway Glass Container | 901 N. Shabbona St | Streator | IL | 61364 | 815-673-5171 | IL | PBX | |
| OIN | A | Oneida Indian Nation | 5447 East Seneca Street | PO Box 316 | Vernon | NY | 13476 | 315/829-8100 | NY | PBX |
| OKMN | C | (Cancelled) TDS Telcom Oakman | 8233 Market St. | Oakman | AL | 35579 | 205-622-3325 | Oakman, Flatwood, Nauvoo, Lynn, Grayson, AL | TDS | |
| OKWTC | A | Oklahoma Western Telephone Company | 102 East Choctaw | Clayton | OK | 74536 | 918/569-4111 | OK | LEC | |
| OMH | A | Long Lines Metro | 501 Fourth Street | PO Box 67 | Sergeant Bluff | IA | 51054 | 605/422-1200 | Eastern SD, Western IA | Facility |
| OMNI | A | OmniTel Communications | 608 E Congress | Nora Springs | IA | 50458 | 800-417-8685 | IA | CLEC | |
| OMPT | C | (Cancelled) Omnipoint Communications Services | 12920 SE 38th St | Bellevue | WA | 98006 | 206-663-7927 | USA | Wireless | |
| OMTWO | I | (Inactive) OM2 Technology, Inc. | 451 W. Riddle Ave. | Ravenna | OH | 44266 | 866/662-4911 | All United States | PBX | |
| ONES | C | (Cancelled) Onestar Long Distance, Inc. | 7100 Eagle Crest Blvd | Evansville | IN | 47715 | 800-482-0000 | ME, MA | Facility | |
| ONSLO | A | Onslow Coop. Telephone Assn. | 102 Anamosa Avenue | P.O. Box 6 | Onslow | IA | 52321-0006 | 563-485-4281 | Onslow, IA | LEC |
| ONSTR | P | OnStream Communications, Inc. | 609 W 31 1/2 St. | Austin | TX | 78705 | 512-468-6948 | TX | Facility | |
| ONT | A | Ontario Telephone Company, Inc. | 75 Main Street | Phelps | NY | 14532 | 315-548-9600 | NY | Facility | |
| ONVOY | A | Onvoy | 300 South Highway 169 | Suite 700 | Minneapolis | MN | 55426 | 763-230-4141 | MN | Facility |
| ONW | A | Connect Communications, LLC | 5002 Hickory Blvd. | Hickory | NC | 28601 | 828/312-9702 | North Carolina | Facility | |
| OONE | A | O1 Communications, Inc. | 770 L Street, Ste. 960 | Sacramento | CA | 95814 | 888/444-1111 | CA | Facility | |
| OPC | C | (Cancelled) The Other Phone Co/Access One Comm | 4205 Vineland Rd. Suite L-15 | Orlando | FL | 32811 | 800-547-7101 | LA, MA, AL, TN, KY, NC, SC, GA, FL | Facility | |
| OPNTV | C | Cancelled) OpenTV, Inc. | 401 E. Middlefield Road | Mountain View | CA | 94043-4005 | 800-604-4005 | CA | PBX | |
| OPTEL | C | (Cancelled) OpTel, Inc. | 1111 West Mockingbird Lane, Suite 1000 | Dallas | TX | 75247 | 800-322-1021 | AZ, CA, CO, FL, IL, IN, TX | Facility & PBX | |
| OPTPR | A | Otivon Telecommunications, Inc. | 27 Gonzalez Guisti | Suite 101 | Guaynabo | PR | 00922 | 407-414-0338 | PR | Facility |
| OPTUS | P | Optivon, Inc. | 7887 Bryan Dairy Road | Suite 280 | Largo | FL | 33777 | 813-600-6090 | FL, CT | VoIP |
| ORG99 | A | OregonTel, LLC | 1709 NE 27th Street; Suite C | McMinnville | OR | 97128 | 503-474-7720 | OR | Facility | |
| ORL | A | Cordia Communications Inc | 2500 Silver Star Road | Suite 500 | Orlando | FL | 32804 | 407-766-5921 | FL, NY, PA, NJ | Reseller |
| ORM | A | Coon Rapids Municipal Utilities | 123 3rd Ave. | Coon Rapids | IA | 50058 | 712-999-2225 | IA | facility | |
| ORW | A | Orwell Telephone Company | 70 South Maple Street | Orwell | OH | 44076 | 440-437-6111 | OH | Facility | |
| OSM | A | Osage Municipal Communications Utility | 720 Chestnut Street | PO Box 207 | Osage | IA | 50461 | 641-832-3731 | IA | Facility |
| OSTEL | I | (inactive) OneSource Teleservices | 2324 West Charleston | Suite 101 | Las Vegas | NV | 89102 | 702-210-8323 | NV | Facility |
| OTC | A | Orlando Telephone Company | 4558 SW 35th St., Suite 100 | Orlando | FL | 32811 | 407-996-8900 | Orlando, FL | Facility | |
| OTE | A | O T E Communications | 102 E. Kirkwood Street | P.O. Box 279 | Odin | IL | 62870 | 800-642-5437 | IL | RLEC |
| OTR | A | Otter Tail Telcom | 224 Lincoln Ave. W | Fergus Falls | MN | 56537 | 877-680-6082 | 218 area city exchanges 583; 643; 736; 739; 864; 998 | Facility | |
| OTSCO | A | Otsego County 9-1-1 Communications | 172 County Highway 33 W | Cooperstown | NY | 13326 | 607-547-5351 | Otsego Couty | PBX | |
| OTT | A | Oklahoma Telephone and Telegraph, Inc. | 6100 Highway 16 | PO Box 290 | De Leon | TX | 76444 | 918-656-3233 | OK | Facility |
| OTTLN | A | Otterbein Lebanon Retirement Community | 585 North State Route 741 | Lebanon | OH | 45036 | 513-932-2020 | Lebanon, OH | PBX | |
| OWS | A | Neutral Tandem | 2 North Lasalle | Suite 1615 | Chicago | IL | 60602 | 866-388-7258 | IL | CLEC |
| OXNET | A | Oxford Networks | PO Box 128, Depot St. | Buckfield | ME | 04220-0128 | 207-336-9931 | ME | Facility | |
| OZ78 | A | Allendale Telephone Company | 6568 Lake Michigan Drive | PO BOX 509 | Allendale | MI | 49401-9229 | 616-895-9911 | MI | Facility |
| PACAD | A | Phillips Academy | 180 Main Street | Phillips Academy | Andover | MA | 01810 | 888-770-9551 | PBX | PBX |
| PAGER | A | The Pager Company | 3030 East Truman Road | Kansas City | MO | 64127 | 800-281-6920 | MO | Reseller | |
| PALAV | I | (Inactive) Palavon, Inc. | 2325 Dulles Corner Blvd. | Suite 500 | Herndon | VA | 20171 | 703-400-6869 | US | VoIP/PBX |
| PATEL | A | Pennsylvania Telephone Company | 191 Middle Road | Jersey Shore | PA | 17740 | 570-745-3111 | PA | LEC | |
| PATVL | A | Pattersonville Telephone Company | 1309 Main Street | PO Box 240 | Rotterdam Junction | NY | 12150 | 518-887-2121 | Rotterdam Jct; Pattersonville; Hoffmans, NY | Facility |
| PB911 | A | SBC Pacific Bell | 3707 Kings Way, RM C33 | PO Box 15038 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | ILEC |
| PBAFY | C | (Cancelled) SBC CA/Allegiance Telecom, Inc. | 3707 Kings Way, Rm. C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE-Comp | |
| PBAQH | C | (Cancelled) SBC CA/ Adelphia Business Solutions | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBARZ | C | (Cancelled) SBC / PacWest Telecom, Inc. | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBATT | C | (Cancelled) SBC CA/AT&T | 3707 Kings Way, RM C33 | PO Box 15038 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE |
| PBAUE | C | (Cancelled) SBC CA/Accutel of Texas | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | Ca | UNE | |
| PBAYN | C | (Cancelled) SBC CA/Cat Communications Intern. | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBAYV | C | (Cancelled) SBC CA/ACN Communication Services | 370 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBAZC | C | (Cancelled) SBC CA / Arrival Communications | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBBGP | C | (Cancelled) SBC CA//Budget Phone | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBBUL | C | (Cancelled) SBC CA/Bullseye Telecom | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBCFG | C | (Cancelled) SBC CA/ California Cat & Technology | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBCSC | C | (Cancelled) SBC CA/Comm South Companies, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA,NV | UNE | |
| PBDIN | C | (Cancelled) SBC CA/dPi Teleconnect, LLC | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBDVN | C | (Cancelled) SBC CA/Advanced Telcom Group | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA, NV | UNE | |
| PBDXI | A | SBC CA/DMR Communications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBEEO | C | (Cancelled) SBC CA/Access One | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBEHN | C | (Cancelled) SBC CA / Enhanced Communications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA | UNE | |
| PBELG | C | (Cancelled) SBC CA/ Electric Lightwave, Inc. | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBELZ | C | (Cancelled) SBC CA / Z-Tel Communication | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBEMG | C | (Cancelled) SBC CA/Enhanced Communications Group LLC | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBENC | C | (Cancelled) SBC CA/Ernest Communications, Inc. | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| PBEUN | C | (Cancelled) SBC CA/Express Telephone Services | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA, NV | UNE | |
| PBEXL | C | (Cancelled) SBC CA/Excel Telecommunications | 3707 Kings Way, RM C33 | PO Box 15038 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA, NV | UNE |
| PBEXU | C | (Cancelled) SBC CA/eLEC Communications | 3707 Kings Way | Room C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE |
| PBFLI | C | (Cancelled) SBC CA / FriendlyLEC, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA, NV | UNE | |
| PBFLS | C | (Cancelled) SBC CA/Global Crossing | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBFOA | C | (Cancelled) SBC CA/Fones4All Corporation | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBFOU | C | (Cancelled) SBC CAl/Telekenex | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA | UNE | |
| PBGBQ | C | (Cancelled) SBC CA/Globalcom, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBGSS | C | (Cancelled) SBC CA/Vycera | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA,NV | UNE | |
| PBHTJ | C | (Cancelled) SBC CA / Adelphia | 3707 Kings Way, Rm C33 | Sacramento | CA | 9585-1038 | 800-275-0014 | CA | UNE | |
| PBHTU | C | (Cancelled) SBC CA/Telescape Communications | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-038 | 800-275-0014 | CA | UNE | |
| PBIRZ | C | (Cancelled) SBC CA / Airespring, Inc. | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBIUH | C | (Cancelled) SBC CA / In Touch Communications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBIVS | C | (Cancelled) SBC CA/ECI Communications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBKMM | C | (Cancelled) SBC CA/KMC Telecom | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBLGW | C | (Cancelled) SBC CA / Telephone Service Inc. | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBLOA | C | (Cancelled) SBC CA / AT&T | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBMQD | C | (Cancelled) SBC CA/Merced.Net – UNE | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBMWN | C | (Cancelled) SBC CA/McGraw Communications, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBMWU | C | (Cancelled) SBC CA / Midwestern Telecommunications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBMWU | C | (Cancelled) SBC CA / Midwestern Telecommunications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBNIK | C | (Cancelled) SBC CA/NII Communications, LTD. | 3707 Kings Way, RM C33 | Sacramento | CA | 95851 | 800/275-0014 | CA, NV | UNE | |
| PBNMX | C | (Cancelled) SBC CA/Norcast Communications Corp | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA | UNE | |
| PBNVG | C | (Cancelled) SBC CA / Navigator Communications | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBNWF | C | (Cancelled) SBC / New Access Communications, LLC | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA,NV | UNE |
| PBOPE | C | (Cancelled) SBC CA/01 Communications, Inc. | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA, NV | UNE | |
| PBOXE | C | (Cancelled) SBC CA/Communications Express | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0041 | CA | UNE | |
| PBPFV | C | (Cancelled) SBC CA/Phones For All | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBPNJ | C | (Cancelled) SBC CA/Pacific Centrex Services | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| PBPXE | C | (Cancelled) SBC / Phoneco | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE |
| PBPXT | C | (Cancelled) SBC CA/Apex Telecom | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PBREV | C | (Cancelled) SBC CA/Creative Interconnect Com | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| PBRIM | C | (Cancelled) SBC CA/TMC Communications – UNE-P | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBRTC | A | Paul Bunyan Rural Telephone Co-op | 1831 Anne St. NW #100 | Bemidji | MN | 56601-5612 | 888-586-3100 | North Central MN | Facility | |
| PBS | C | (Cancelled) Pacific Bell Services | 1140 Galaxy Way, Suite 400 | Concord | CA | 94520 | 800-275-0014 | CA | Facility | |
| PBSGZ | C | (Cancelled) SBC CA/Sage Telecom | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA | UNE | |
| PBSIU | C | (Cancelled) SBC CA/1-800-Reconnex | 3707 Kings Way, Room C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBSNB | C | (Cancelled) SBC CA/First World So Cal | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBSTI | C | (Cancelled) SBC/Supra Telecommunications | 3707 Kings Way, RM C33 | PO BOX 15038 | Sacramento | CA | 95851 | 800-275-0014 | CA,NV | UNE |
| PBSUU | C | (Cancelled) SBC CA/ Supra Telecommunications | 3707 Kings Way, RM c33 | Sacramento | CA | 95851 | 800-275-0014 | CA,NV | UNE | |
| PBT | A | PBT Communications | 1660 Juniper Springs Road | Gilbert | SC | 29054 | 803-894-4222 | SC | CLEC, IXC | |
| PBTAJ | C | (Cancelled) SBC CA/TCAST Communications | 3707 Kings Ave., RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA | UNE | |
| PBTC | A | Pine Belt Telephone Company, Inc. | 3984 County Road 32 | Arlington | AL | 36722 | 334-385-2106 | AL | ILEC | |
| PBTCO | A | PBT Telcom, Inc. | 1660 Juniper Springs Rd. | Gilbert | SC | 29054-9414 | 803-894-4222 | SC | ILEC | |
| PBTFU | C | (Cancelled) SBC CA/TelePacific Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA, NV | UNE | |
| PBTGX | C | (Cancelled) SBC CA / TGEC Communications | 3707 Kings Way, Rm. C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| PBTPM | C | (Cancelled) SBC CA/AT&T | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBTVN | C | (Cancelled) SBC CA/Talk.com Comm | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBTZJ | C | (Cancelled) SBC / Tel West Communications, LLC. | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA, NV | UNE |
| PBUID | C | (Cancelled) SBC CA/Lightyear Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBUTC | C | (Cancelled) SBC CA / Sprint | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBUYT | C | (Cancelled) SBC CA/Utility Telephone Inc. | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | California | UNE | |
| PBVEN | C | (Cancelled) SBC CA/One Point Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | California | UNE | |
| PBVHC | C | (Cancelled) SBC CA/Virtual Hipster Corp | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE | |
| PBVOS | C | (Cancelled) SBC / VCOM Solutions, Inc. | 3707 Kings Way | Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA,NV | UNE |
| PBVRT | C | (Cancelled) SBC CA/VarTec Telecom | 3707 Kings Way, RM C33 | Sacramento | CA | 95823 | 800/275-0014 | CA | UNE | |
| PBW | A | Pine Belt Wireless | 5 Broad Street | Selma | AL | 36701 | 334-992-7005 | Marengo, Choctaw, Wilcox, Dallas, Perry counties in AL | Facility | |
| PBWHA | C | (Cancelled) SBC CA/Wholesale Air-Time, Inc. | 3707 Kings Way, Room C33 | Sacramento | CA | 95851 | 800-275-0014 | CA | UNE | |
| PBWMA | C | (Cancelled) SBC CA / Anew Telecommunications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | California | UNE | |
| PBWTV | C | (Cancelled) SBC CA/Competitive Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| PBWUA | C | (Cancelled) SBC CA/MCI Metro – UNE | 3707 Kings Way, Rm C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE | |
| PBYOY | C | (Cancelled) SBC CA / Cypress Communications | 3707 Kings Way, Room C33 | Sacramento | CA | 95823 | 800-275-0014 | CA | UNE | |
| PCC | A | Partner Communications Cooperative | 101 E Church Street | Gilman | IA | 50106-0008 | 641/498-7701 | Cities of IA-Gilman, Kellogg, Baxter | Facility | |
| PCIS | A | Price County Information Systems | 177 N. 4th Avenue | Park Falls | WI | 54556 | 715-339-1101 | WI | CLEC | |
| PCL | A | United Communications (UNICOM) | 389 SW Scalehouse Court #100 | PO Box 1191 | Bend | OR | 97702 | 800-342-4708 | WA, OR | Facility |
| PCM | A | Telscape Communications, Inc. | 606 East Huntingtong Drive | Monrovia | CA | 91016 | 626/415-1398 | CA | Facility & Resa | |
| PCN | A | Plateau Wireless | 7111 North Prince St | Clovis | NM | 88101 | 505-389-5100 | TX, NM | Cellular | |
| PCS | A | Pacific Centrex Services, Inc. | 6855 Tujunga Ave. | North Hollywood | CA | 91605 | 800-275-0014 | CA | Centrex | |
| PCSLS | A | Pacific Centrex Services, Inc. | 6855 Tujunga Avenue | North Hollywood | CA | 91605 | 800-275-0014 | CA | Line Split | |
| PCSO | OB | (Out of Business) PCS One | Suite 100 | 227 Granite Run Dr. | Lancaster | PA | 17601 | 717-721-7234 | PA | Wireless |
| PCTC | A | Price County Telephone Company | 105 N Avon Avenue | P.O. Box 108 | Phillips | WI | 54555-0108 | 715-339-2151 | WI | Facility |
| PEMB | A | Pembroke Telephone Cooperative | 504 Snidow Street | PO Box 549 | Pembroke | VA | 24136 | 540-626-7111 | VA | Facility |
| PEOKS | A | Peoples Telecommunications, LLC | 208 N. Broadway Street | La Cygne | KS | 66040 | 913-757-2711 | KS | Facility | |
| PEOPL | A | Peoples Telephone Company | 221 Main Street | PO Box 366 | Aurelsa | IA | 51005-0366 | 712-434-5989 | IA | Facility |
| PGC | A | Abramson Center | 1425 Horsham Road | North Wales | PA | 19454 | 215-371-3000 | PA | PBX | |
| PGEN | A | Pigeon Telephone Company | 7585 W. Pigeon Rd | Pigeon | MI | 48755 | 800-292-0614 | MI | ILEC | |
| PGW | A | Philadelphia Gas Works/911 ETC | 1800 N. 9th Street | Philadelphia | PA | 19122 | 888-249-4980 | PA | PBX | |
| PICUS | C | (Cancelled) Picus Communications, LLC | PO Box 3370 | Norfolk | VA | 23514 | 757-321-4900 | VA | Reseller | |
| PINE | C | (Cancelled) Pine Drive Telephone Company | 8611 Central Ave | PO Box 188 | Beulah | CO | 81023-0188 | 719-485-3400 | CO Counties: Pueblo, Custer | Facility |
| PINPT | C | (Cancelled) BellSouth – PinPoint | 2400 Century Pkwy NE, Suite 600 | Atlanta | GA | 30345 | 800-784-7925 | AL, LA, MS, TN, KY, NC, SC, GA, FL | ILEC | |
| PINS | A | Public Interest Network Services | 50 W. 17th Street | 9th Floor | New York | NY | 10011 | 212-479-1799 | NY, NJ | Facility |
| PION | A | Pioneer Telephone Cooperative | 1304 Main St. | PO Box 631 | Philomath | OR | 97370 | 541-929-1212 | OR | ILEC |
| PITC | A | Pine Island Telephone Company | 108 SW 2nd St. | Pine Island | MN | 55963-0588 | 800-992-8857 | US | LEC | |
| PITTS | C | (Cancelled) Pittsgrove Twp. Board of Education | 1076 Almond Rd. | Pittsgrove | NJ | 08318 | 856-358-3094 | Pittsgrove K-12 Campus | PRI T-1 PB | |
| PLAN | A | Planters Telephone Co-op | 100 Ogeechee Street | Newington | GA | 30446 | 912-682-6880 | GA | Facility | |
| PLANT | A | Plant Telecommunications | 1703 US Highway 82 W | Tifton | GA | 31793 | 229-528-4777 | GA | Facility | |
| PLATC | A | Plateau Communications | 7111 N. Prince Street | Clovis | NM | 88101 | 505-389-5100 | NM | CLEC | |
| PLC | A | Poka Lambro Telephone Cooperative | PO Box 1340 | Tahoka | TX | 79373 | 800-422-2387 | TX | Facility | |
| PLDI | C | (Cancelled) Pioneer Long Distance, Inc. | P.O. Box 779 | Kingfisher | OK | 73750 | 800-375-6162 | OK | CLEC | |
| PLNI | I | (Inactive) Pacific LightNet, Inc. | 737 Bishop Street | Suite 1900 | Honolulu | HI | 96813 | |||
| PMT | A | Project Mutual Telephone Cooperative | 507 G Street | Rupert | ID | 83350 | 208-436-7151 | ID | Facility | |
| PMTC | A | Peoples Mutual Telephone Co. | 123-E Watts St. | Gretna | VA | 24557 | 804-656-2291 | Pittsylvania County | Facility | |
| PNEER | A | Pioneer Telephone Association, Inc. | 120 West Kansas Avenue | Ulysses | KS | 67880 | 620-356-3211 | KS | Facility | |
| PNHDL | A | Panhandle Telephone Cooperative, Inc. | 603 S. Main Street | Guymon | OK | 73942 | 580-338-2556 | Texas County, OK; Hansford County, TX; Sherman County, TX | Facility | |
| POLAR | A | Polar Communications/Polar Telecommunications, Inc. | 110 4th St. E | P.O. Box 270 | Park River | ND | 58270 | 800-284-7127 | ND, MN | LEC |
| POPP | A | POPP Communications | 620 Mendelssohn Ave. North | Suite 111 | Golden Valley | MN | 55427 | 763-797-7900 | MN | Facility |
| POSN | A | Posner Telecommunications, Inc. | PO Box 792292 | San Antonio | TX | 78279 | 210/826-9288 | TX | CLEC | |
| POWER | OB | (Out of Business) Powertel | 1233 O. G. Skinner Dr. | West Point | GA | 31833 | 888-670-0003 | GA, AL, TN, MS, FL, SC, KY, IN | Wireless | |
| PPC | A | Pinpoint Communications Inc | 611 Patterson St | PO Box 490 | Cambridge | NE | 69022 | 800-793-2788 | NE | Facility |
| PPL | A | Providence Public Library | 150 Empire Street | Providence | RI | 02903 | 401-455-8000 | RI | PBX | |
| PPTCI | C | (Cancelled) Prepaid Tel.com Inc. | 409 Center Street, 2nd Floor | Yuba City | CA | 95991 | 530/822-0326 | CA | Reseller | |
| PRC | A | Pine Run Community | 777 Ferry Road | Doylestown | PA | 18901 | 215-340-5175 | PA | PBX | |
| PREMR | C | (Cancelled) Premiere Network Services, Inc. | 1510 North Hampton RoadSuite 120 | DeSoto | TX | 75115 | 888-739-4734 | TX, CA, FL, CO, WI, NY, PA, MA, RI, KY | Facility | |
| PRICE | C | (Cancelled) Price Communications Wireless, Inc. | 1800 Phoenix Blvd. Suite 120 | Atlanta | GA | 30349 | 770-210-8000 | AL, GA | Wireless | |
| PRIME | C | (Cancelled) PrimeCo Personal Communications | 6 Campus Circle | Westlake | TX | 76262 | 800-264-6620 | AL, AR, FL, GA, HI, IL, IN, LA, MI, MS, NC, TX, VA, WI | Wireless | |
| PRISM | C | (Cancelled) Prism Communications Services Inc. | 11 Beach St. 2nd Floor | New York | NY | 10013 | 917-305-2020 | All | Facility | |
| PRKLD | A | Parkland School District | 2700 Cedarcrest Blvd. | Allentown | PA | 18105 | 610-351-5590 | PA | Facility | |
| PRLNK | A | PRIMELINK | 130 Arizona Avenue Suite 1840 | Plattsburgh | NY | 12903 | 518-563-5465 | NY | Facility | |
| PROCM | A | Mountain Communications LLC d/b/a Procom | Rt. 3, Box 69G | Bruceton Mills | WV | 26525 | 304-379-8276 | MD, PA | CLEC | |
| PROGR | P | Progressive Rural Telephone Co-op | 890 Simpson Ave. | PO Box 98 | Rentz | GA | 31075 | 478-984-4724 | GA | ILEC |
| PROJ | A | Project Telephone Company | 61 Hwy. 13 S. | Scobey | MT | 59263 | 406-783-5659 | MT | Telco | |
| PRTC | A | Piedmont Rural Telephone Cooperative | 201 Anderson Drive | Laurens | SC | 29360 | 864/682-3131 | Laurens County, SC | LEC | |
| PRTCI | A | Palmetto Rural Telephone Cooperative | 2471 Jefferies Hwy | Walterboro | SC | 29488 | 843-538-5481 | Colleton County, SC | LEC | |
| PRTCM | A | PRTCommunications, LLC | 201 Anderson Dr. | Laurens | SC | 29360 | 864-682-3131 | City of Laurens, SC | CLEC | |
| PRTEL | A | Park Region Mutual Telephone Co. | 100 Main Street | Underwood | MN | 56586-0277 | 800-247-2706 | MN | LEC | |
| PRTL | A | Primus Telecmomunications, Inc. | 7901 Jones Branch Drive | Suite 900 | McLean | VA | 22102 | 866-901-0911 | US | VOIP |
| PRTLD | A | PRT Larga Distancia, Inc. | 1515 Roosevelt Ave | 11th Floor | Guaynabo | PR | 00968 | 787-749-5500 | PR | VoIP |
| PRWAV | A | PrairieWave Communications Telecommunications, Inc. | 2002 Industrial Road | Viborg | SD | 57070 | 877-633-4567 | MN, SD, IA | Facility | |
| PSABN | C | (Cancelled) -Cypress Communications | 0ne International Way | Headquarter 8125 Intermedia Way | Tampa | FL | 33647 | 888/424-4911 | USA | PBX |
| PSBF | C | ( Cancelled – see PSMCI) Brooks Fiber | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75082 | 800-844-1001 | USA | PBX PS/ALI |
| PSC | I | (Inactive) Public Service Cellular, Inc. | 104 Winston Street | Reynolds | GA | 31076 | 800-342-7622 | AL, GA, SC | Wireless | |
| PSMCI | I | (Inactive) MCI | 2400 N. Glenville | Building A, Cube A3021 | Richardson | TX | 75082 | 800-844-1001 | USA | PBX PS/ALI |
| PSRTC | A | Perry-Spencer Rural Telephone Coop. | 11877 E. State Rd. 62 | St. Meinrad | IN | 47577 | 812-357-2123 | IN | LEC | |
| PST | A | Public Service Telephone Company | 104 Winston Street | Reynolds | GA | 31076 | 888-593-7782 | GA | ILEC | |
| PSWC | C | (Cancelled – see PSMCI) WorldCom | 2400 N. Glenville | Building A, Cube A3021 | Richardson | TX | 75082 | 800-844-1001 | USA | PBX PS/ALI |
| PTC | A | Pioneer Telephone Coorperative | 108 East Robberts Ave. | Kingfisher | OK | 73750 | 800-375-6162 | OK | ILEC | |
| PTCC | A | Town of Pineville dba PTC Communications | Pineville Telephone Company Office | 118 College St. | Pineville | NC | 28134 | 704-889-5700 | Town of Pineville, NC | CLEC |
| PTCCL | A | Palmetto Telephone Communications LLC | 2471 Jefferies Hwy | Walterboro | SC | 29488 | 843-538-5481 | City of Walterboro, SC | CLEC | |
| PTCI | A | Pineland Telephone Coop., Inc. | 30 S. Rountree St. | Metter | GA | 30439 | 912-685-8200 | Pineland Telephone Coop. Inc. Service Area, GA. | ILEC | |
| PTCNP | A | Pioneer Cellular | 309 N. 5th | Kingfisher | OK | 73750 | 405-375-0390 | OK, KS | Wireless | |
| PTCO | A | Palmerton Telephone Company | 465 Delaware Ave. PO Box 215 | Palmerton | PA | 18071 | 610-826-2115 | PA | Local | |
| PTCTX | A | Personal Touch Communications, L.P. | PO Box 619 | 200 Frisco St. | Cumby | TX | 75432 | 888-994-4604 | TX | IXC & CLEC |
| PTEL | A | Pineville Telephone Company | 118 College Street | PO BOX 249 | Pineville | NC | 28134 | 704-889-2001 | Town of Pineville, NC | ILEC |
| PTELE | A | Primetel | 6 East Breckenridge | Bixby | OK | 74008 | 918-366-7000 | OK | Facility | |
| PTG | C | (Cancelled) PTG Communications, Inc. | 1217 6th St., Suite 2C | Norco | CA | 92860 | 909-735-8140 | CA | PBX | |
| PTGGM | I | (Inactive) Grandmarc | 3549 Iowa Ave., Building G | Riverside | CA | 92507 | 909/788-5800 | CA | PBX | |
| PTI | A | PENN Telecom, Inc. | 2710 Rochester Rd. | Cranberry Twp. | PA | 16066 | 877-449-3311 | PA (Western) | Facility | |
| PTL | OB | (Out of Business) Property Technologies, Ltd. | 6501 Dickens Place | Richmond | VA | 23230 | 804-288-5500 | USA | PRI | |
| PTMC | A | Piedmont Telephone Membership Corp. | 191 Reeds Baptist Church Road | Lexington | NC | 27295 | 336-787-5678 | Western Davidson County | Facility | |
| PTSI | A | Panhandle Telecommunication Systems, Inc. | 603 S. Main | Guymon | OK | 73942 | 800-327-7525 | TX | Facility | |
| PTT | C | (Cancelled) Pine Tree Telephone Co. | PO BOX 48 | Bar Mills | ME | 04004-0048 | 207-657-9931 | Gray, New Gloucester, ME | LEC | |
| PTTEC | A | Peoples Telephone Co., Inc. | 300 W. Main Street | Erin | TN | 37061 | 931-289-4423 | TN | ILEC | |
| PTV | A | Prime Time Ventures, LLC | 611 Siskiyou Blvd. | Suite 2 | Ashland | OR | 97520 | 541-488-1962 | OR | Facility |
| PUA | A | PaeTec Communications, Inc. | 290 Woodcliff Dr. | Fairport | NY | 14450 | 877-340-2555 | US | CLEC | |
| PUSD | A | Piedmont Unified School District | 760 Magnolia Ave. | Piedmont | CA | 94611 | 510-715-2932 | CA | PBX | |
| PVN | A | PVT NetWorks, Inc. | 4011 W. Main Street | Artesia | NM | 88210-9566 | 505-748-1163 | NM | Facility | |
| PVT | A | Penasco Valley Telephone Coop., Inc. | 4011 West Main Street | Artesia | NM | 88210-9566 | 800-505-4844 | NM | Facility | |
| PVTN | C | (Cancelled) PVT NetWorks, Inc. | 4011 W. Main Street | Artesia | NM | 88210-9566 | 505-748-1241 | NM | Facility | |
| PWRTC | A | Pulaski-White Rural Telephone Co-Op | 5573 S US HWY 35 | Star City | IN | 46985 | 219-595-7121 | Counties of Pulaski, White, Fulton, Cass | LEC | |
| PWT | A | Pac-West Telecomm, Inc. | 1776 W. March Lane | Suite 250 | Stockton | CA | 95207 | 877-626-4325 | CA, WA, OR, NV, AZ, UT | Facility |
| PWZ | A | Pathwayz Communications, Inc. | 4176 Canyon Drive | Amarillo | TX | 79109 | 866-549-5106 | TX | Facility | |
| PYMAT | A | Pymatuning Telephone Company | 5 Edgewood Dr. | Greenville | PA | 16125-8832 | 724-646-1122 | Mercer County, PA | 1 LEC | |
| PZNYC | P | Pfizer | 235 East 42nd Steet | 235/11 | New York | NY | 10017 | 888-520-9941 | New York City | PBX |
| QCSD | A | Quakertown Community School District | 600 Park Avenue | Quakertown | PA | 18951 | 800-242-2121 | PA | PBX | |
| QCTEL | A | Queens College | 65-30 Kissena Blvd. | Powdermaker Hall 027 | Flushing | NY | 11367 | 800-829-1011 | NY | PBX w/ PRI |
| QNMT | A | Quantum Telecommunications, Inc. | 2975B Manchester Rd. | Manchester | MD | 21102 | 410-239-6920 | MD | Facility | |
| QSH | A | Quicksilver, Inc. | 15202 Grahm Street | Huntington Beach | CA | 92649 | 714-889-3705 | CA | PBX | |
| QWSTC | A | Qwest Communications-(US West) | 200 South 5th Street | Room 890 | Minneapolis | MN | 55402-1499 | 800-357-0911 | AZ, CO, ID, IA, MN, MT, NE, NM, ND, OR, SD, UT, WA, WY | Tel. Co. |
| QWSTI | I | (Registration Inactive) Qwest Communications (VoIP) | 200 South 5th Street | Minneapolis | MN | 55402-1499 | 800-357-0911 | ALL | VoIP | |
| QWSTP | A | Qwest Communications-(US West) | 200 South 5th Street | Room 890 | Minneapolis | MN | 55402-1499 | 800-357-0911 | AZ, CO, IA, ID, MN, MT, NE, NM, ND, OR, SD, UT, WA, WY | PS/ALI |
| QWSTW | C | (Cancelled) Qwest Wireless | 200 South 5th Street | Room 890 | Minneapolis | MN | 55402-1499 | 800-387-7647 | CO, AZ, OR, WA, MN, WY, NM, NE, IA, ID, MT, UT | Wireless |
| RAEX | C | (Cancelled) Raex Communications, Inc. | 7584 Whipple Ave. NW | North Canton | OH | 44720 | 330-292-0080 | OH | Facility | |
| RAG | A | Ragland Telephone Co., Inc. | PO Box 577 | 630 Main Street | Ragland | AL | 35131 | 205-472-2141 | Ragland, AL | Provider |
| RAIN | A | Rainier Connect, Inc. | 104 Washington Ave. N | Eatonville | WA | 98328 | 360-832-6161 | Graham, WA | Facility-C | |
| RAMKY | A | Ramcell of KY | 1527 S Main St. | London | KY | 40741 | 606-877-7600 | KY | Facility | |
| RAMNC | A | Ramcell of NC | 1185 Russ Ave. | Waynesville | NC | 28786-2964 | 828-646-8755 | NC | Facility | |
| RAMOR | A | Ramcell of OR | 1740 NW. Goetz St. | Roseburg | OR | 97470 | 541-670-7008 | OR | Facility | |
| RANTC | C | (Cancelled) Randolph Telephone Company | 211 W. Swannanoa Ave. PO Box 609 | Liberty | NC | 27298-0609 | 336-622-7921 | Alamance, Guilford, Randolph, Chatam Counties, NC | LEC | |
| RBC | A | R & B Communications | 1154 Shenandoah Village Drive | Waynesboro | VA | 22980 | 540-992-3112 | VA | ILEC | |
| RBRTY | A | R&B Realty | 2222 Corinth Ave. | Los Angeles | CA | 90064 | 310-444-2564 | USA | PBX | |
| RCBLT | A | Ricebelt Telephone Company, Inc. | 228 Kings Highway | PO Box 388 | Weiner | AR | 72479-0388 | 870-684-2288 | AR | ILEC |
| RCC | A | Rural Cellular Corporation | 3905 Dakota Street | P.O. Box 2000 | Alexandria | MN | 56308 | 866-974-0148 | ME, NH, VT, NY, MA, AL, MS, KS, MN, SD, ND, WI, OR, WA, ID | Wireless |
| RCFAM | A | RC Family of Companies | 205 Main St | PO Box 197 | New Effington | SD | 57255 | 605-637-5211 | SD | Reseller |
| RCN | A | RCN | 1525 Valley Center Pkwy., Floor 3 | Bethlehem | PA | 18017 | 610-443-2803 | PA,CA,MA,NY | Facility | |
| RCRTC | A | Roosevelt County Rural Telephone Coop. | 201 West Second Street | PO Box 867 | Portales | NM | 88130 | 505-226-2255 | NM | Facility |
| RCSD | A | SureWest Telephone dba SureWest Broadband | 5411 Luce Avenue | McClellan | CA | 95652 | 916-786-1523 | Greater Sacramento | Facility | |
| RCWL | A | Rockwell Cooperative Telephone Assoc | 111 4th St N | Rockwell | IA | 50469-0416 | 641-822-3211 | IA | Facility | |
| RECI | C | (Cancelled) Reliant Energy Communications, Inc. | 1301 Travis | Houston | TX | 77002 | 713-207-5483 | TX | Facility | |
| RED | C | (Cancelled) Redwood County Telephone Co. | 731 Main Street | PO Box 130 | Wabasso | MN | 56293 | 507/342-8000 | Yellow Medicine, Redwood, Cottonwood, Murrary, Brown Countie | LEC |
| REDSQ | A | Redsquare Corporation | 9325 Alameda Harbor Ave. | Las Vegas | NV | 89117 | 803-370-1715 | NC, SC, NV | CLEC | |
| REGIS | A | Regis University | 3333 Regis Blvd. | Mail Code N-4 | Denver | co | 80221 | 888-837-1067 | CO | PBX |
| REMI | A | Remi Communications | 138 South Main Street | Suite 200 | Greensburg | PA | 15601 | 724-836-5800 | PA, NJ, NY, MD, VA, WV, DE, OH, DC | Facility |
| RESV | A | Reservation Telephone Cooperative | 24 N. Main | Parshall | ND | 58770 | 701-862-3115 | ND | LEC | |
| REVOL | A | Revol | c/o Cleveland Unlimited Inc. | 7165 E. Pleasant Valley Road | Independence | OH | 44131 | 216-525-1212 | OH, IN, PA | PCS |
| RFB | I | (Inactive) RFB Cellular, Inc. | 2136 West M-32 | Gaylord | MI | 49735 | 989-732-7335 | MI | Facility | |
| RGTC | A | The Ringgold Telephone Company | 6203 Alabama Highway | Ringgold | GA | 30736 | 706-965-2345 | GA | Facility | |
| RGTS | A | Rockefeller Group | Managed by 911 ETC/ dialtone by Verizon | 19119 N. Creek Parkway, Suite 101 | Bothell | WA | 98011 | 800-773-7911 | USA | PSALI |
| RHTC | A | Rock Hill Telephone Company | 330 E. Black Street | Rock Hill | SC | 29730 | 803-326-7203 | SC | Facility | |
| RI1 | P | MetLife Insurance Company | 700 Quaker Lane | 3rd Floor | Warwick | RI | 02886 | 646-728-5782 | RI | PBX |
| RICH1 | C | (Cancelled) Richmond Telephone Company | 1416 State Road | Richmond | MA | 01254 | 413-698-2255 | MA | Facility | |
| RICH2 | I | (Inactive) Richmond Connections Inc | 124 Fenn St | Pittsfield | MA | 01201 | 413-698-2255 | MA | Facility | |
| RIDER | A | Rider University | 2083 Lawrenceville Rd. | Lawrenceville | NJ | 08648-3099 | 800-234-3799 | NJ | PBX | |
| RIDOC | A | Rhode Island Department of Corrections | Telecommunications Unit | 40 Howard Ave | Cranston | RI | 02920 | 401-462-5997 | office | PBX |
| RIO | A | Rio Communications | 2600 NE Division Street | Suite 100 | Bend | OR | 97701 | 541-385-4999 | OR | Facility |
| RIOV | A | Rio Virgin Telephone Co | 61 West Mesquite Blvd. | Mesquite | NV | 89027 | 800-308-6744 | NV, AZ | Facility | |
| RISD | A | Rhode Island School of Design | 2 College Street | Providence | RI | 02903-2784 | 401-454-6100 | Rhode Island School of Design | PBX | |
| RITTR | A | Ritter Communications, Inc. | 3300 One Place | Jonesboro | AR | 72404 | 870-974-0071 | AR | CLEC | |
| RLD | A | Reserve Telecommunication Inc. | 203 West 4th St | Reserve | LA | 70084 | 504-536-3635 | LA | Facility | |
| RMY | A | Reinbeck Telecommunications Utility | 414 Main Street | Reinbeck | IA | 50669 | 319-788-6404 | IA | Facility | |
| RNK | A | RNK Telecom TM | 333 Elm St. | Suite 310 | Dedham | MA | 02026 | 781-382-0001 | MA, RI, NH, NY, ME, VT | Facility |
| RNKV | P | RNK Telecom | 333 Elm Street | Suite 310 | Dedham | MA | 02026 | 800-941-7302 | National | CLEC Facility, CLEC Reseller, VoIP |
| RNSN | A | Runestone Telephone Association | 123 Memorial Dr. PO Box 336 | Hoffman | MN | 56339 | 320-986-2013 | MN: Barrett, Cyrus, Donnelly, Elbow Lake, Hoffman, Kesington | LEC | |
| ROCK | C | (Cancelled) Rock Solid Broadband, Inc. | 2821 South Parker Rd. | #1305 | Aurora | CO | 80014 | 866-762-5765 | CO | Reseller |
| ROGER | A | MetroPCS, Inc. | 8144 Walnut Hill Lane | Suite 800 | Dallas | TX | 75231 | 214/376-3876 | Sacramento & San Francisco, CAAtlanta, GASouth, FL | Wireless |
| ROSE | A | City of Roseville | 401 Oak Street, Suite 404 | Roseville | CA | 95678 | 916-774-5000 | City of Roseville | PBX | |
| ROYAL | I | (Inactive) Royal Telephone Company | 307 Main Street | Royal | IA | 51357 | 712-933-2615 | Royal, IA | Facility | |
| RRCOM | A | Red River Telecom, Inc. | 506 Broadway | Abercrombie | ND | 58001 | 800/417-8685 | Richland County and Sargent County, ND | Facility | |
| RRHA | A | Richmond Redevelopment & Housing Authority | 901 Chamberlayne Parkway | MIS Dept. | Richmond | VA | 23220 | 804-780-4200 | VA | PBX |
| RRRTA | A | Red River Rural Telephone Association | 506 Broadway | Abercrombie | ND | 58001 | 800/417-8685 | Clay County, Wilkin County, Richland County, ND | Facility | |
| RSA | A | RSA 1 Limited Partnership DBA Cellular 29 Plus | 404 Howland Street | PO Box 289 | Emerson | IA | 51533 | 712/370-0423 | IA | Wireless |
| RSH | C | (Cancelled) Royal Sonesta Hotel Boston/Cambridge | 5 Cambridge Parkway | Cambridge | MA | 02142 | 617-491-3600 | MA | PBX | |
| RSRV | A | Reserve Telephone Company, Inc. | PO Drawer T | Reserve | LA | 70084 | 504-536-3635 | Reserve, Garyville & Mt. Airy in St. John the Baptist Parish | Facility | |
| RSVL | A | SureWest Telephone | 8150A Industrial Ave | Roseville | CA | 95678 | 916-786-1523 | CA | ILEC | |
| RTC | A | Rochester Telephone Company, Inc. | 117 W. 8th Street | Rochester | IN | 46975 | 219-223-4396 | IN | LEC, CLEC | |
| RTCCC | A | RTC Communications Corp. | 117 W. 8th Street | Rochester | IN | 46975 | 219-223-4396 | IN | CLEC | |
| RTCI | A | Riviera Telephone Company, Inc. | 103 South 8th Street | Riviera | TX | 78379 | 361-296-3232 | TX | Facility | |
| RTCID | A | Rural Telephone Company | 892 West Madison Avenue | Glenns Ferry | ID | 83623 | 208-366-2614 | ID | Facility | |
| RTCOM | A | RT Communications, Inc. | 130 S. 9th Street | Worland | WY | 82401 | 800-538-8036 | SD, WY | ||
| RTEL | A | Randolph Telephone Company | 211 W. Swannanoa Avenue | PO Box 609 | Liberty | NC | 27298 | 336-622-7900 | NC | Facility |
| RTI | A | Roome Telecommunications, Inc. | 705 West Second St. | Halsey | OR | 97348 | 541-369-2211 | Halsey & surrounding area | Facility | |
| RTINC | A | Ready Telecom, Inc. | 220 Sunset Avenue | Asheboro | NC | 27203 | 336-625-5080 | NC | Facility | |
| RTMC | A | Randolph Telephone Membership Corp. | 3733 Old Cox Rd. | Asheboro | NC | 27205 | 336-879-5684 | NC | Facility | |
| RTSC | A | Nex-Tech, Inc | 145 N. Main Street | Lenora | KS | 67645 | 785-567-4281 | KS | CLEC | |
| RTTEC | A | Roanoke Telephone Co., Inc. | 950 Main Street | Ranoke | AL | 36274 | 334-863-4949 | AL | ILEC | |
| RTTI | P | Randolph Telephone Telecommunications, Inc. | 3733 Old Cox Road | Asheboro | NC | 27205 | 336-879-5684 | NC | CLEC Facility | |
| RUC | A | Reedsburg Utility Commission | 501 Utility Court | Reedsburg | WI | 53959 | 608-768-1001 | WI | Facility | |
| RURL | A | Rural Telephone Service Co., Inc. | 145 N. Main Street | Lenora | KS | 67645 | 785-567-4281 | KS | ILEC | |
| RVE | A | 3 Rivers Telephone Cooperative | 202 Fifth Street South | Fairfield | MT | 59436 | 406-467-3748 | MT | FAC, RESLR | |
| RVTC | A | River Valley Telephone Coop. | 106 E. Robins Street | P.O. Box 298 | Graettinger | IA | 51342 | 712-859-3300 | IA | ILEC |
| SAGE | A | Sage Telecom, Inc. | 805 Central Expy. South, Ste.100 | Allen | TX | 75013-2789 | 800-246-1363 | TX, AR, MO, KS, OK | UNE-P | |
| SAHPC | C | (Cancelled) Savannah Independent PCS, Inc. | 4890 Raley Rd. | Macon | GA | 31206 | 912-476-9700 | Augusta | PCS | |
| SANDY | A | Big Sandy Telecom, Inc. | 631 Elk Street | P.O. Box 218 | Simla | CO | 80835-0218 | 719-541-2261 | CO | Exchange |
| SATCO | A | South Arkansas Telephone Co. | 1st & Main PO Box 778 | Hampton | AR | 71744 | 501-798-2025 | AR | Facility | |
| SATL | A | S&A Telephone Co., Inc. | 413 Main St. | Allen | KS | 66833 | 620-341-0315 | Allen, Admire, and Scranton, KS | Facility | |
| SBC | A | Saddleback Communications | 10190 E McKellips | Scottsdale | AZ | 85256 | 480-850-7150 | AZ: Salt River Pima Maricopa Indian Community | Facility | |
| SBCEL | P | Sagebrush Cellular, Inc. | 61 Highway 13 S | PO Box 600 | Scobey | MT | 59263 | 406-228-2600 | MT, ND | Wireless |
| SBCIP | A | AT&T Internet Services | 1010 N. St. Marys | Room 13G | San Antonio | TX | 78215 | 866-219-5199 | ALL | VOIP |
| SBCIS | A | SBC Telecom, Inc. | 1010 N. Saint Marys St. | San Antonio | TX | 78215 | 877-588-1316 | All | Facility | |
| SBCMW | C | (Cancelled – See CING) Cingular Wireless | 892 Woodsmill Road | Ballwin | MO | 63011 | 877-792-7662 | MO, OK, KS, AR, TX | Wireless | |
| SBCT | A | SBC Telecom, Inc. | 1460 Round Table Drive | 1st Floor | Dallas | TX | 75247 | 866-730-8154 | ALL | Facility, R |
| SBICO | A | Smith Bagley Inc. d/b/a Cellular One | 1500 S. White Mountain Rd. | Suite 103 | Show Low | AZ | 85901 | 928-532-0082 | Page AZ; Navajo County, AZ; Apache County, AZ; McKinley Coun | Wireless |
| SBWGL | C | (Cancelled) Cellular One Chicago | 8888 Keystone Crossing | Suite300 | Indianapolis | IN | 46270 | 847-765-5300 | Porter County & Lake County, IN; IL | Wireless |
| SCANA | A | South Canaan Cellular Comm., LP | Route 296 | PO Box 160 | South Canaan | PA | 18459 | 570/937-4114 | PA-Pike County | Wireless |
| SCBN | A | BlazeNet | 2050 South Queen Street | York | PA | 17403 | 800-905-7170 | PA | Facility | |
| SCC | A | Select Connect Communications LLC | 1960 McCullough Blvd. | Tupelo | MS | 38801 | 662-620-1386 | MS | Facility | |
| SCCOM | A | Sound Choice Communications, LLC | 7839 12th Ave. S. | Bloomington | MN | 55425 | 651-999-0888 | MN, WI | VoIP LEC | |
| SCI | C | (Cancelled) Southside Communications | 2614 Woods Lane | Garland | TX | 75044 | 972-530-8197 | Dallas, TX | LSP | |
| SCITX | A | Stellar Communications, Inc. | 1820 Wilbarger St. | Vernon | TX | 76384 | 940-552-2937 | TX | Facility | |
| SCNET | A | SCNet dba Spirit Telecom | 1500 Hampton Street | Columbia | SC | 29201 | 888/864-7226 | Columbia, SC | Facility | |
| SCOM | A | Triton PCS | 800 Lake Murray Blvd. | Irmo | SC | 29063 | 888-992-5945 | SC, NC, GA | Wireless | |
| SCSLN | A | Smart City Solutions, LLC. | 3100 Bonnet Creek Rd. | Lake Buena Vista | FL | 32830 | 407/828-1234 | FL | Faciltiy | |
| SCT | A | South Central Wireless dba South Central Telcom | 101 S. Main | Medicine Lodge | KS | 67104 | 877-866-4962 | KS | Facility | |
| SCTA | A | South Central Tel Association, Inc. | 101 S. Main Street | Medicine Lodge | KS | 67104 | 877/866-4962 | Hazelton, Sun City, Lake City, Sharon, Turon, Iuka, Kiowa-KS | Facility | |
| SCTC | A | The South Canaan Telephone Company | Route 296 | South Canaan | PA | 18459 | 570-937-4114 | PA | Facility | |
| SCTL | A | Smart City Telecom | 3100 Bonnet Creek Road | P.O. Box 22555 | Lake Buena Vista | FL | 32830 | 407-827-1234 | FL | LEC |
| SCTLC | A | South Central Telcom LLC | 1399 Happy Valley Rd. | Glasgow | KY | 42141 | 270/678-2615 | KY | CLEC, LEC | |
| SDCT | A | School District of Cheltenham Township | Administration Building | 1000 Ashbourne Road | Elkins Park | PA | 19027 | 215-881-6315 | PA | PBX |
| SDDPC | I | (Inactive) San Diego Data Processing | 5975 Santa Fe St. | San Diego | CA | 92109 | 858-581-9911 | CA | PBX | |
| SENEC | A | Seneca County Emergency Management Office | 1 DiPronio Dr. | Waterloo | NY | 13165 | 315-539-9241 | NY | PBX | |
| SEREN | A | Seren Innovations, Inc. | 15 South Fifth Street, Ste. 500Suite 500 | Minneapolis | MN | 55402 | 800-427-8686 | MN, CA | Facility | |
| SETAL | A | Southeast Telephone | 106 Scott Avenue | Pikeville | KY | 41501 | 800-800-6609 | KY | Reseller | |
| SETEL | A | SouthEast Telephone Co. | 106 Scott Ave. | A | Pikeville | KY | 41501 | 888-364-8000 | KY | Facility |
| SFO | A | San Francisco International Airport | Airport Commission – ITT | PO Box 8097 | San Francisco | CA | 94128 | 650-794-4410 | San Francisco International Airport | PBX |
| SGL | A | Sigecom LLC | 1301 W. Lloyd Company | Evansville | IN | 47710 | 812-437-0309 | IN | Facility | |
| SGNTL | A | Signatel Telephone Corp. | 3850 S. Freeway | Fort Worth | TX | 76110 | 800-220-4818 | TX | Reseller | |
| SGRDL | A | The Segerdahl Corporation | 1351 S. Wheeling Rd. | Wheeling | IL | 60090 | 847-541-1080 | IL | PBX | |
| SHN | A | Shenandoah Telephone Company | 106 S. Main Street | Edinburg | VA | 22824 | 540/984-5220 | VA | LEC | |
| SHORE | A | Shoreham Telephone Company | 3167 Route 22A | Shoreham | VT | 05770-0236 | 802-462-9911 | VT | Facility | |
| SHRN | A | Sharon Telephone Company | 105 Plain Street | Sharon | WI | 53585 | 262-736-9981 | IL | Facility | |
| SHTC | A | Sandhill Telephone Coop., Inc. | 122 S Main St | Jefferson | SC | 29718 | 843-658-3471 | Chesterfield, Kershaw Counties | Facility | |
| SHU | A | Seton Hall University | 400 South Orange Avenue | South Orange | NJ | 07079 | 973-761-9300 | NJ | PBX | |
| SIAC | I | (Inactive) Securities Industry Automation Corp. | 2 MetroTech Center | Brooklyn | NY | 11201 | 212-383-4368 | NY | Centrex | |
| SIC | A | Sandwich Isles Communications, Inc. | 1001 Bishop Street | Pauahi Tower 27th Floor | Honolulu | HI | 96813 | 808-539-3663 | HI | Facility |
| SI-ER | C | (Cancelled) Smithsonian Institution | 900 Jefferson Drive | A&I Bldg. | Washington | DC | 20560-0445 | DC, MD, VA | VOIP | |
| SIERA | A | Sierra Telephone Co., Inc. | P.O. Box 219 49150 Rd. 426 | Oakhurst | CA | 93614 | 209-683-2119 | Madera & Mariposa Counties, CA | Facility | |
| SIREN | C | (Cancelled) Siren Telephone Company | 7723 West Main Street | PO Box 506 | Siren | WI | 54872 | 715/349-2224 | Burnett Co, WI | ILEC |
| SIRTC | A | Southeastern Indiana Rural Telephone Cooperative | 14005 US 50 PO. Box 7 | Dillsboro | IN | 47018 | 888-200-8077 | IN | LEC, Facility | |
| SISQ | A | Siskiyou Telephone Co. | 30 Telco Way | Etna | CA | 96027 | 530-468-3001 | Etna, FtJones, Hamburg, HappyCmp, KalmathRiv, SawyersBar, So | Facility | |
| SIT | C | (Cancelled) Staten Island Telecom, LLC | 145 Coale Avenue | Staten Island | NY | 10314 | 718-442-2258 | NY | Reseller | |
| SITI | A | San Isabel Telecom, Inc. | 570 Lindbergh Drive | PO Box 1130 | Gypsum | CO | 81637 | 303-319-2269 | Eagle County, CO | Facility |
| SKBST | A | SkyBest Communications, Inc. | PO Box 759 | 1200 NC HWY 194 North | West Jefferson | NC | 28694 | 336/982-3111 | NC | CLEC |
| SKSRT | A | Spruce Knob Seneca Rocks Telephone | P.O. Box 100, Rt. 33 | Riverton | WV | 26814 | 304-567-8911 | WV | Facility | |
| SKTC | A | Dalton Telephone Company | 112 S. Lee | PO Box 800 | Clearwater | KS | 67026 | 620/584-2255 | Nebraska | ILEC |
| SKTCE | A | SKT Elsie Communications | 112 S. Lee | PO Box 800 | Clearwater | KS | 67026 | 620/584-2255 | NE | ILEC |
| SKTIN | A | SKT, Inc. | 112 S. Lee | PO Box 800 | Clearwater | KS | 67026 | 620-584-2255 | KS | ILEC |
| SKYLD | OB | (Out of Business) Skyland Technologies, Inc. | 218 58th St W | Williston | ND | 58801 | 701-577-1000 | ND | Facility | |
| SKYWA | C | (Cancelled) Skyway Partners Inc | 200 Motor Parkway | Hauppauge | NY | 11788 | 800-965-4442 | MD, PA | PBX | |
| SLEDG | A | Sledge Telephone Company | 124 Delta Avenue | PO Box 68 | Sunflower | MS | 38778 | 662-569-3311 | MS | Facility |
| SLEY | A | Sleepy Eye Telephone | 121 2nd Avenue NW | Sleepy Eye | MN | 56085 | 320*848-3221 | MN | LEC | |
| SLEYE | A | Sleepy Eye Telephone Company | 121 2nd Ave. NW | Sleepy Eye | MN | 56085 | 507-794-3000 | MN | LEC | |
| SLIC | A | SLIC Network Solutions | 50 Main Street | Room 100 | Potsdam | NY | 13676 | 315-328-4415 | NY | CLEC |
| SLINC | A | Southern LINC Wireless | 600 N. 18th Street | GN0800 | Birmingham | AL | 35203 | 800-406-0151 | AL, GA, MS, FL | Wireless |
| SLPBX | I | (Inactive) Sprint | 6200 Sprint Parkway | Overland Park | KS | 66251-6117 | 877-433-1989 | USA | PS ALI | |
| SLU | A | St. Lawrence University | Information Technology | 23 Romoda Drive | Canton | NY | 13617 | 315-229-5555 | NY | PBX |
| SMART | A | Smartcom Telephone, LLC | 600 Ash Ave. | McAllen | TX | 78501 | 888-302-1125 | TX | Facility | |
| SMCU | A | Spencer Municipal Utilities | 712 North Grand Ave. | P.O. Box 222 | Spencer | IA | 51301 | 712-262-3027 | Other | Facility |
| SMMC | A | Southern Maine Medical Center | 1 Medical Center Drive, Box 626 | Biddeford | ME | 04005-0626 | 207-283-7000 | ME | Facility | |
| SMOKE | OB | (Out of business) Smoke Signal Communications | 8400 South Gessner | Houston | TX | 77074 | 800-597-4130 | All | Reseller | |
| SMTC | P | Southern Montana Telephone Company | 205 Main Street | PO Box 205 | Wisdom | MT | 59761 | 406-689-3333 | MT | ILEC |
| SMVL | A | Smithville Telephone Company, Inc. | 1600 W. Temperance St. PO Box 728 | Ellettsville | IN | 47429-0728 | 812-876-9644 | IN | ILEC | |
| SNBOH | A | Second National Bank | 108 Main Avenue, SW | PO Box 1311 | Warren | OH | 44481 | 330/841-0458 | OH | PBX |
| SNCA | A | Seneca Telephone Company | 816 Oneida St. | Seneca | MO | 64865 | 417-776-2247 | MO, OK, AR | ILEC | |
| SNECU | A | Southern New England Fed. Credit Union | 412 Washington Avenue | North Haven | CT | 06473 | 203-988-0461 | CT | PBX | |
| SNET | C | (Cancelled) Southern New England Telecom Corp. | 6 Devine Street, 3rd Floor | New Haven | CT | 06473 | 203-420-3911 | CT | All | |
| SNMN | A | Enhanced Telecommunications Corp | 123 Nieman Street | PO BOX 145 | Sunman | IN | 47041 | 812-623-2122 | Sunman, IN | Facility |
| SOKA | I | (Inactive) Soka University of America | 1 University Drive | Aliso Viejo | CA | 92656 | 888-362-2522 | CA | PBX | |
| SOKAN | A | Southern Kansas Telephone Company | 112 S. Lee | PO Box 800 | Clearwater | KS | 67026 | 620-584-2255 | KS | ILEC |
| SOPLN | A | South Plains Telephone Cooperative Inc | 2425 Marshall St | Lubbock | TX | 79415 | 800-692-4057 | TX | ILEC | |
| SOV | A | State of Vermont | Telecommunications Section | 10 Baldwin Street | Montpelier | VT | 05633-3701 | 802-828-3760 | VT | Centrex |
| SPE | A | Sony Pictures Entertainment | 10202 W Washington Blvd | Culver City | CA | 90232 | 310-244-5505 | CA | CLEC Facility ILEC | |
| SPK | A | SNIP Link | 100-A Twinbridge Drive | Pennsauken | NJ | 08110 | 609-706-5550 | PA, NJ, DE, MD | Facility | |
| SPPCS | A | Sprint PCS | 6000 Sprint Parkway | KSOPHP0502 | Overland Park | KS | 66251 | 888-877-7330 | US | Facility |
| SPRBD | A | Springboard Telecom, LLC | 245 E. Main St. | Rock Hill | SC | 29730 | 704-365-8890 | NC Bell Territory | Facility | |
| SPRCL | I | (Inactive) Sprint Communications Company LP | 6200 Sprint Parkway | Overland Park | KS | 66251-6117 | 866-398-3284 | USA | CLEC Facility | |
| SPRFM | I | (Inactive) Sprint (Metro) | 555 Lake Border Drive | Apopka | FL | 32703 | 877-433-1989 | FL | Facility | |
| SPRN | A | Springville Co-Operative Telephone Assn. | 207 Broadway | P.O. Box 9 | Springville | IA | 52336 | 319-854-9960 | IA | Facility |
| SPRNT | I | (Inactive) Sprint | 2330 Shawnee Mission Pkwy | Westwood | KS | 66205 | 877-433-1989 | USA | ILEC | |
| SPRUC | A | Spruce Communications L.P. | 5542 Wenonah Drive | Dallas | TX | 75209 | 214/902-0240 | TX | reseller | |
| SRC | A | Santa Rosa Tel Cooperative, Inc. | 1401 Main St. | Vernon | TX | 73684 | 940-886-2019 | Santa Rosa, TX | ILEC,CLEC | |
| SRT | I | (Inactive) Scott-Rice Telephone Company | 4690 Colorado St. SE | Prior Lake | MN | 55372 | 612-447-5611 | MN | Facility | |
| SRTT | C | (Cancelled) Saco River Telegraph&Telephone Co. | 63 Main Street | Bar Mills | ME | 04004 | 207-929-9931 | ME | ILEC | |
| SSADC | A | Social Security Administration | Managed by 911 ETC, Inc. (dialtone by Verizon) | 19119 North Creek Pkwy, Suite 101 | Bothel | WA | 98011 | 800-773-7911 | Wastern States | PS/ALI |
| SSD | A | Springfield School District | 111 West Leamy Avenue | Springfield | PA | 19064 | 610-938-6000 | Springfield Township | PBX | |
| SSTAR | A | Sliver Star Communications | 104101 US Highway 89 | Freedom | WY | 83120 | 307-883-2411 | WY, ID | Facility | |
| STAC | A | St. Thomas Aquinas College | 125 Route 340 | Telecommunications, Spellman SG-8 | Sparkill | NY | 10976-1050 | |||
| STAR | A | Starpower Communications | 1000 Derekwood Ave. | Palmer Bldg. | Lanham | MD | 20706 | 610-443-2803 | DC, MD, VA | Facility |
| star1 | A | Star Communications | 77420 Landry Drive | Maringouin | LA | 70757 | 225-625-7777 | LA | ILEC | |
| START | A | Star Telephone Membership Corp | 3900 N US 421 HWY | Clinton | NC | 28328 | 800-945-4233 | NC | Facility | |
| STC | A | Schaller Telephone Company | 111 W 2nd Street | PO Box 9 | Schaller | IA | 51053 | 712/275-4211 | IA | Facility |
| STC | C | (Cancelled – See ALLTL) Standard Telephone Company | 2000 Communications Blvd. | Cornelia | GA | 30531 | 706-776-4611 | USA | Facility | |
| STCO | A | Shidler Telephone Company | 120 Broadway | PO Box 25 | Shidler | OK | 74652 | 918-793-2211 | OK | Facility |
| STCOM | A | S & T Communications Inc. | 320 Kansas Avenue | PO Box 99 | Brewster | KS | 67732 | 785/825-8131 | KS | Facility |
| STEU | A | Steuben County | Stueben County Office Building | 3 East Pulteney Square | Bath | NY | 14810 | 607-664-2248 | Steuben County, NY | PBX |
| STFL | C | (Cancelled) State of Florida/Department of State | 409 E. Gaines Street | Tallahasse | FL | 32301-2412 | 850-487-6021 | FL | Facility | |
| STFRM | A | State Farm Mutual Insurance Companies | One State Farm Plaza | Bloomington | IL | 61710-001 | 800-543-3191 | Home Offices, Bloomington, IL | PBX | |
| STI | A | Stratos Telecommunications Inc. | 701 Poydras Street | Suite 1550 | New Orleans | LA | 70139 | 800-375-1562 | LA, TX | Facility |
| STJOE | A | Saint Joseph’s University | 5600 City Ave | Philadelphia | PA | 19465 | 610-660-1111 | PA | PBX | |
| STM | A | Stoneham Cooperative Telephone Corp. | 41625 Marble Ave. | Stoneham | CO | 80754 | 970-735-2251 | Town: Stoneham | LEC | |
| STMC | A | Skyline Telephone Membership Corporation | 1200 NC Hwy 194 North, PO Box 759 | West Jefferson | NC | 28694 | 336-982-3111 | Ashe, Alleghany, Avery, & Watauga, NC, Johnson, TN | Facility | |
| STMIC | A | St. Michaels College | One Winoski Park | Colchester | VT | 05439 | 802-655-2519 | VT | PBX | |
| STN | A | Southern Telecom Network | 710 “”C”” Hwy 5 North | Mountain Home | AR | 72653 | 870-404-7090 | AR | Facility | |
| STND | A | Standish Telephone Company | 3 Oak Hill Road | Standish | ME | 04084 | 888-889-9950 | Standish, Sabego, Denmark, Limington | Facility | |
| STOLF | A | St. Olaf College | 1520 St. Olaf Ave. | Northfield | MN | 55057 | 507-646-3818 | MN | Facility | |
| STRW | A | Gateway Telecom, LLC, dba, StratusWave | 1025 Main Street, Mull Center, 9th Floor | Wheeling | WV | 26003 | 304-281-6168 | WV | Facility | |
| STS | A | Sherburne Tele-Systems | 440 Eagle Lake Rd. N | P.O. Box 310 | Big Lake | MN | 55309 | 763-262-4120 | MN | Facility |
| STS01 | A | STS Telecom | 444 Brickell Ave | Suite 224 | Miami | FL | 33131 | 954-252-1000 | FL | CLEC |
| STSTV | C | (Cancelled) St. Stephen’s & St. Agnes School | 1000 St. Stephen’s Rd. | Alexandria | VA | 22304 | 703-751-2700 | VA | PBX | |
| STTEL | A | S & T Telephone Coop Assn | 320 Kansas Avenue | PO BOX 99 | Brewster | KS | 67732 | 785-825-8131 | NW, KS | Facility |
| STTN | A | Stayton Cooperative Telephone Company | 475 N. 2nd Avenue | Stayton | OR | 97383 | 503/769-2124 | OR | Facility | |
| STUIN | A | Studios Inn | 348 S. Clover Ave. | San Jose | CA | 95124 | 408-850-7800 | CA | PBX | |
| STVL | A | Steelville Telephone Exchange, Inc. | 61 East Hwy 8 | Steelville | MO | 65565 | 573-775-2111 | MO | Facility | |
| SUF | A | Suffolk University | 8 Ashburton Place | Voice Communications Department | Boston | MA | 02108 | 617-573-8299 | MA | PBX |
| SUREW | C | (Cancelled- See RCSD) SureWest Broadband | 5411 Luce Ave | McClellan | CA | 95652 | 916-786-1523 | Greater Sacramento, CA | CLEC | |
| SURRY | A | Surry Telephone Membership Corporation | 819 East Atkins Street | Dobson | NC | 27017 | 336-374-4527 | Surry and Stokes County | Facility | |
| SURTI | A | Surry Telecommunications, Inc. | 819 East Atkins Street | PO Box 385 | Dobson | NC | 27017 | 336-374-4527 | NC | Facility |
| SURWW | A | SureWest Wireless | 200 Vernon St. | Roseville | CA | 95678 | 916-786-1523 | CA | Wireless | |
| SUTEL | A | Salisbury University | 1101 Camden Avenue | Salisbury | MD | 21801 | 410-543-6000 | MD | PBX | |
| SUU | A | Supra Telecommunications | 2901 SW 149th Avenue | Suite 300 | Miramar | FL | 33027 | 877-433-6662 | FL | Facility |
| SVC | A | 911 Services, LLC | 700 Lavaca | Suite 1200 | Austin | TX | 78701 | 512-663-2593 | Other | 911 |
| SWAT | A | Southwest Arkansas Telephone Coop, Inc. | 2601 East Street | Highway 71 South | Texarkana | AR | 71854-8073 | 870-653-8111 | AR, TX | Facility |
| SWBT | C | (Cancelled) Southwestern Bell Telephone | 208 S. Akard Street | #2600 | Dallas | TX | 75202 | 214-286-6911 | TX | Facility |
| SWH | A | Swisher Telephone Company | 72 2nd Street | PO Box 266 | Swisher | IA | 52338-0266 | 319-857-4200 | IA | Facility |
| SWJ | A | Swiftel Communications, Inc. | 120 Jackson Street | Vidalia | GA | 30474 | 912-608-3250 | GA | Facility | |
| SWOTC | A | Southwest Oklahoma Telephone Company | 101 North Main | PO Box 220 | Duke | OK | 73532 | 580-679-3345 | OK | ILEC |
| SWTC | C | (Cancelled) SouthWest TeleConnect | PO Box 200606 | Austin | TX | 78720 | 800-550-7540 | AR, KS, MO, OK, TX | Reseller | |
| SWTTC | A | Southwest Texas Telephone Co. | 939 S. Texas Highway 55 | Rocksprings | TX | 78880 | 830-683-2111 | TX | Facility | |
| SYN01 | A | Synthes(USA) | 1301 Goshen Parkway | West Chester | PA | 19380 | 610-719-6500 | West Chester Area Office | PBX | |
| SYR | A | Syringa Networks LLC | 3795 S. Development Ave | Suite 100 | Boise | ID | 83705 | 800-454-7214 | Boise | |
| T2T2 | A | T2 Communications, LLC. | 301 Hoover Blvd. | First Floor | Holland | MI | 49423 | 616-355-2202 | MI | Facility |
| T3COM | A | T3 Communications LLC | 2401 First St | Ste 301 | Ft Myers | FL | 33901 | 239-333-4357 | FL | Facility |
| TALK | A | Talk America | 12020 Sunrise Valley Drive, Suite 250 | Reston | VA | 20191 | 866-438-6454 | MI, OH, GA | Facility | |
| TALKO | P | TalkOn | 1190 S Colorado | Suite 300 | Denver | CO | 80246 | 720-323-5255 | CO | Reseller |
| TALLG | C | (Cancelled) TallGrass Communications, Inc | 1 South 450 Summit Ave. Suite 140 | Oakbrook Terrace | IL | 60181 | 248-766-9601 | OH, IL, MI, WI, IN | Facility | |
| TANC | A | The Academy of the New Church | 2765 Huntington Pike | PO Box 278 | Bryn Athyn | PA | 190090278 | 215/947-4200 | PA | PBX |
| TAYCO | A | Tex-Link Communications | 3201 Cherry Ridge St. #D-400 | San Antonio | TX | 78230 | 213/892-4100 | TX | Facility | |
| TAYL | A | Taylor Telephone Coop, Inc. | 9796 N i-20 | P. O. Box 370 | Merkel | TX | 79536-0370 | 800-238-4155 | TX | ILEC |
| TAYLT | A | Taylor Telecommunications | 9796 N. I-20 Access Road | PO Box 337 | Merkel | TX | 79536 | 325-846-4111 | TX | Cellular |
| TBI | C | (Cancelled) Telebeam | 441 Science Park Rd. | State College | PA | 16803 | 814-238-0000 | PA | Reseller | |
| TBTC | A | Tularosa Basin Telephone Co. | 503 St. Francis Drive | Tularosa | NM | 88352 | 505/585-8222 | Tularosa, Carrizozo, Cloudcroft, NM | LEC | |
| TCAST | A | TCAST Communications | 24251 Town Center Drive, 2nd Floor | Valencia | CA | 91355 | 661/253-5030 | CA | Facility | |
| TCCD | A | Tarrant County College District | Attn: Director of Physical Plants | 828 Harwood Rd. | Hurst | TX | 76054-3219 | 817-515-8911 | All | PBX |
| TCCU | A | Columbia Teachers College | 525 W. 120th St. | New York | NY | 10027 | 212-678-8210 | NY | Facility | |
| TCG | A | AT&T Local Services | 7630 S. Chester Street | Suite 300 | Englewood | CO | 80112 | 888-249-4980 | USA | |
| TCGEN | A | Tech Com | 1027 N. Jefferson Street | PO BOX 439 | Richland Center | WI | 53581 | 608-985-7202 | Reedsburg, WI | Facility |
| TCI | A | Cingular Wireless | Chief E9-1-1 Compliance Officer | PO Box 97061 | Redmond | WA | 98073 | 800-635-6840 | ALL | Wireless |
| TCS | I | (Inactive) Telecommunication Systems | 2401 Elliott Avenue | Suite 200 | Seattle | WA | 98121 | 800-959-3749 | All | VPC |
| TCTMC | A | Tri-County Telephone Memb Corp | 2193 NC 99 Hwy S, P.O. Box 520 | Belhaven | NC | 27810 | 252-964-8000 | NC Counties: Beaufort, Hyde, Washington | Facility | |
| TDS | I | (Inactive) TDS Telecom | 301 S. Westfield Road | Madison | WI | 53705-0158 | 608-664-4200 | Al, AR, AZ, CA, CO, FL, GA, ID, IN, KY, ME, MI, MN, MO, MS, | Facility | |
| TELNE | A | Telnet Worldwide Inc. | 1017 Naughton Drive | Tory | MI | 48083 | 248-593-8713 | MI | Facility | |
| TELW | A | Tel West Communications, LLC | 3701 S. Norfolk St., Suite 300 | Seattle | WA | 98118 | 800-813-3880 | WA | Facility | |
| TESS | C | (Cancelled) TESS Communications, Inc. | 12050 N. Pecos St. | Westminister | CO | 80234 | 303-879-9862 | CO, AZ | Facility | |
| TGTEL | A | Thacker-Grigsby Telephone Co., Inc. | 60 Communication Lane | P.O. Box 789 | Hindman | KY | 41822 | 606-785-9555 | KY | Facility |
| THUMB | A | Thumb Cellular | 82 S. Main St | Pigeon | MI | 48755 | 989-453-4333 | MI: Huron, Tuscola, Sanilac | CLEC | |
| TICI | C | (Cancelled) Thousand Islands Communications. | 130 Park Place | Watertown | NY | 13601 | 888-464-4726 | NY | Facility | |
| TLDNT | I | (Inactive) Teltronics Inc -Telident Systems Grp | 970 E. Hennepin Avenue | Minneapolis | MN | 55414 | 800-536-4911 | USA | PBX / 911 | |
| TLGNT | C | (Cancelled) Teligent | 8065 Leesburg Pike, Suite 400 | Vienna | VA | 22182 | 800-269-3563 | Nationwide | Resale, Fac | |
| TLKNX | A | CF Communications, DBA Telekenex | 3221 20th Street | San Francisco | CA | 94110 | 415-445-2118 | Lata 722, Bay Area, CA | Facility | |
| TLTC | A | Twin Lakes Telephone Cooperative Corp. | 201 W Gore Ave | Gainesboro | TN | 38562 | 931-268-0281 | TN Counties: Overton, Clay, Fentriss, Pickett, Jackson, Putn | Co-Op | |
| TMC | A | Turtle Mountain Communications, Inc. | 411 7th Avenue | PO Box 729 | Langdon | ND | 58249 | 701-256-1100 | ND | Facility |
| TMOB | A | T-Mobile Wireless | 12920 SE 38th Street | Bellevue | WA | 98006 | 973-292-8911 | USA | Wireless | |
| TNETS | A | TalkingNets, Inc. | 545 Long Wharf Drive | 5Th Floor | New Haven | CT | 06511 | 877-646-6519 | AZ,CA,CO,DC,FL,GA,IL,MA,MD,MI,MN,MO,NY,NC,OH,PA,TX,UT,VA,WA | Facility |
| TNL | A | Tiagris Network, LLC | Legal Services | 200 South 10th St. #400 | McAllen | TX | 78501-4871 | 800-551-1185 | TX | Facility |
| TOB | A | Town of Burlington, Massachusetts | 29 Center Street | Town Hall | Burlington | MA | 01803 | 781-272-1212 | MA | PBX |
| TOG | A | The Town of Greenwich | 101 Field Point Road | Greenwich | CT | 06830 | 203-912-1055 | Greenwich, CT | PBX | |
| TOLD | A | The Toledo Telephone Co., Inc. | 183 Plomondon Road | Toledo | WA | 98591 | 360-864-2002 | WA | LEC | |
| TOMTC | A | Ottoville Mutual Telephone Company | 245 W. Third Street | Ottoville | OH | 45876 | 419-453-3324 | OH | LEC | |
| TOTAH | A | Totah Telephone Co, Inc. | 101 S. Ochelata Street | Ochelata | OK | 74501 | 918-697-7871 | OK, KS | ILEC | |
| TPAC | OB | (Out of Business) Telepacific Communications | 800 West 6th St., Suite 800 | Los Angeles | CA | 90017 | 310-526-2400 | CA, NV | CLEC | |
| TRAN | A | Trans-Cascades Telephone Co. | 303 S Zobrist | Estacada | OR | 97023 | 503-630-4202 | OR | Facility | |
| TRCNY | A | Tri County Telephone | 1568 South 1000 Road | Council Grove | KS | 66846 | 785-366-7000 | KS | Facility | |
| TRCTC | C | (Cancelled) Three River Community-Tech College | 12 Mahan Drive | Norwich | CT | 06360 | 886-885-2327 | CT | PBX | |
| TRDO | A | Intrado Inc. | 1601 Dry Creek Drive | Longmont | CO | 80503 | 800-856-7504 | ALL | Facility | |
| TRE | A | Tim Ron Enterprises, LLC | 119 W. Tyler | Suite 260 | Longview | TX | 75601 | 903-720-8306 | Longview, TX | Facility |
| TRTC | A | The Rye Telephone Company | 60 Beckwith Drive | Colorado City | CO | 81019 | 719-676-3131 | Pueblo County | Facility | |
| TRTEL | A | Cingular Wireless | Chief E911 Compliance Officer | PO Box 97061 | Redmond | WA | 98073 | 800-635-6840 | ALL | Wireless |
| TRTL | A | Three River Telco | 225 N. 4th Street | PO Box 66 | Lynch | NE | 68746 | 402-569-2666 | NE | Facility |
| TRTN | C | (Cancelled) Triton PCS, Inc.-Mid-Atlantic Region | 4880 Sadler Road; Suite 300 | Richmond | VA | 23060 | 888-663-6230 | VA, TN | Wireless | |
| TRVRG | C | (Cancelled – See NUVOX) Trivergent State Communications | 200 N. Main St., Suite 303 | Greenville | SC | 29601 | 800-800-9681 | NC, SC, GA, FL, AL, MS, LA, TN, KY | Facility, Reseller | |
| TRVT | A | Twin Rivers Valley Telephone | 415 4th Street P.O. Box 23 | Livermore | IA | 50558-0023 | 515-379-1070 | IA | Reseller | |
| TSCC | A | TSC Communications, Inc. | 2 Willipie St. | Wapakoneta | OH | 45895 | 419-739-2201 | OH | Facility | |
| TSS | A | TSS Digital Services, Inc. | 525 Columbia Street NW | Suite 205 | Olympia | WA | 98501 | 360-915-1000 | WA | Facility |
| TTDWT | C | (Cancelled) TidalWave Telephone, Inc. | 14101 Parke Long Ct. Suite F & G | Chantilly | VA | 20151 | 703-968-5744 | Maryland, Washington DC, Virginia | Facility | |
| TTE | A | Tallahassee Telephone Exchange, Inc. | PO Box 11042 | Tallahassee | FL | 32302 | 850-445-7069 | FL, GA | Facility | |
| TTNK | A | Titonka Telephone Company | 247 Main St N | Titonka | IA | 50480-0321 | 515-928-2110 | Kossuth County, IA | LEC | |
| TTTC | A | Table Top Telephone Co., Inc. | 600 N. Second Avenue | Ajo | AZ | 85321 | 520-387-5676 | AZ | Facility | |
| TUC | A | Daystar Communications | 18215 Paulson Dr. | Port Charlotte | FL | 33954 | 877/912-1300 | FL | Facility | |
| TUFON | I | (Inactive) Tufone, Inc. | 295 Madison Avenue | 33 Floor | New York | NY | 10017 | 347-239-2136 | All States | VoIP |
| TUTHL | A | Tuthill Corporation | 8500 S. Madison St | Burr Ridge | IL | 60521 | 630-382-4900 | IL | Facility | |
| TVH | A | 3 Rivers Wireless | 1211 NorthWest Bypass | Great Falls | MT | 59404 | 406-467-3748 | MT | Wireless | |
| TVS | C | (Cancelled) Trinity Valley Services, Inc. | Hwy 175 West Bldg. 206 | Athens | TX | 75751 | 903-677-5916 | TX | Facility | |
| TWCIS | I | (Inactive) Time Warner Cable Information Services | 290 Harbor Dr., 4th Floor | Stamford | CT | 06902 | 877-777-2263 | nationwide | VoIP | |
| TWCOM | A | Time Warner Communications | 10475 Park Meadows Dr. | 4th flr | Littleton | CO | 80124 | 800-875-9489 | USA | Facility |
| TWEST | C | (Cancelled – See TWCOM) Time Warner Telecom | P.O. Box 8935 | 4317 NE Thurston Way | Vancouver | WA | 98668 | 800-875-9489 | WA, OR, CA, AZ, ID, NM | Facility |
| TWIST | C | (Cancelled) Twister Communications Network Inc | 100 Medical Center Blvd, Suite 110 | Conroe | TX | 77304 | 800-894-7837 | ALL | facility | |
| TWST | P | Telwest Network Services | 12101 Tukwila International Blvd. | Suite 300 | Seattle | WA | 98168 | 206-223-1400 | TX | CLEC Facility |
| TWT | A | Tidewater Telecom/Lincolnville Tel. | 133 Back Meadow Rd. | Nobleboro | ME | 04555 | 207-563-9931 | Knox, Lincoln & Waldo counties | ILEC | |
| TWVLY | A | Twin Valley Telephone, Inc. | 22 Spruce Street | Miltonvale | KS | 67466-0395 | 785-427-7912 | KS | Facility | |
| TXACQ | A | TX11 Acquisition LLC | 101 B Temple Blvd. | Lufkin | TX | 75901 | 936-590-1568 | TX | Wireless | |
| TXNET | C | (Cancelled) Texas Network Communication, Inc. | 10777 Westheimer Rd, Suite 1100 | Houston | TX | 77042 | 877-572-1030 | TX | Facility | |
| TXUL | C | (Cancelled – see CCITX) TXU Communications Telephone Company | 300 Decker Drive | Irving | TX | 75062 | 888-608-7822 | TX | Facility | |
| TXUTS | C | (Cancelled – see CCITX) TXU Communications Telecom Services | PO Box 151420 | Lufkin | TX | 75915-1420 | 888-608-7822 | TX | Facility | |
| TYQ | C | (Cancelled) Telergy Central | 1 Telergy Parkway | E. Syracuse | NY | 13057 | 800-889-6716 | US | Facility | |
| UAZ | A | University of Arizona | 1077 N. Highland, Room 150 | Tucson | AZ | 85721 | 520-621-7999 | AZ | PBX | |
| UBC | A | The Community Agency (TCA) | 102 South Eastern St. | PO Box 489 | Sanborn | IA | 51248 | 712/729-5593 | IA | Facility |
| UBN | C | (Cancelled) UBNETWORKS | 700 Wilshire Blvd. 6th Floor | Los Angeles | CA | 90017 | 213-489-9663 | CA | Facility | |
| UBNI | P | Unity Business Networks | 1221 S. Clarkson St. | Suite 430 | Denver | CO | 80210 | 888-837-1067 | CO | VoIP |
| UBNX | P | Unity Business Networks | 1221 S Clarkson St. | Suite 430 | Denver | CO | 80210 | 800-464-4402 | CO, MN | VoIP |
| UBTAL | A | UBTA-UBET Communications | 211 E 200 N | PO Box 398 | Roosevelt | UT | 84066 | 435-622-5275 | UT | Facility |
| UCAYD | C | (Cancelled) Nevada Bell/Eschelon Telecom of NV | 3707 Kings Way, RM C33 | Sacramento | CA | 95851 | 800/275-0014 | NV | UNE-Comp | |
| UCC | A | Union County College | 1033 Springfield Ave. | Cranford | NJ | 07016 | 908-709-0268 | NJ | PBX | |
| UCDVN | C | (Cancelled) Pacific Bell/Advanced TelCom Group | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA, NV | UNE-Comp | |
| UCENC | C | (Cancelled) Pacific Bell/Ernest Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE-Comp | |
| UCNVG | C | (Cancelled) Pacific Bell / Navigator UNE Complex | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA, NV | UNE-Comp | |
| UCPNJ | C | (Cancelled) Pacific Bell/Pacific Centrex Services | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | CA | UNE | |
| UCRIM | C | (Cancelled) Pacific Bell/TMC Communications | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | California | UNE-Comp | |
| UCVUL | C | (Cancelled) Pacific Bell/Vertex Broadband | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800/275-0014 | California | UNE-Comp | |
| UCWMA | C | (Cancelled) Pacific Bell / Anew Telecommun. Cor. | 3707 Kings Way, RM C33 | Sacramento | CA | 95851-1038 | 800-275-0014 | CA | UNE – Comp. | |
| UDAC | A | USDATANET | 318 South Clinton St | Ste 500 | Syracuse | NY | 13202 | 315-952-8574 | NY | Facility |
| UDALS | A | University of Dallas | 1845 E. Northgate Drive | Irving | TX | 75062 | 800-875-9489 | City of Irving | PBX | |
| UEM | A | United Telecom, Inc. | 300 Bay Street | Petoskey | MI | 49770 | 231-347-1025 | Northern MI | Facility | |
| UID | A | Lightyear Network Solutions LLC | 1901 Eastpoint Pkwy | Louisville | KY | 40223 | 800-275-0014 | CA | UNE | |
| UIL | A | United Illuminating Company | 157 Church Street | PO Box 1402 | New Haven | CT | 06506-0902 | 203-926-4540 | CT | PBX |
| UML | A | University of Massachusetts – Lowell | 1 University Ave | Lowell | MA | 01854 | 978-934-4000 | University of Massachusetts – Lowell | PBX | |
| UNION | A | Union Telephone Company | 850 North Highway 414 | Mountain View | WY | 82939 | 307-782-6131 | WY, CO, UT | Facility | |
| UNITS | A | The Ohio State University | 320 W 8th Avenue | Columbus | OH | 43201 | 614-292-2525 | OH | PBX | |
| UNITY | A | Unitel, Inc. | 25 Main St | Unity | ME | 04988 | 207-948-3900 | ME | LEC | |
| UNL | C | (Cancelled) Broadwing Local Services Inc. | 36 East Seventh Street | Suite 2400 | Cincinnati | OH | 45202 | 800-735-3030 | OH, IN, KY | Reseller |
| UNRV | A | Union River Telephone Company | 126 Old Airline Road | Aurora | ME | 04408 | 207-584-9292 | ME: Washington, Hancock | LEC | |
| UNTEL | A | United Telephone Association, Inc. | 1107 W. McArtor Road | Dodge City | KS | 67801 | 620-227-8641 | KS | ILEC | |
| UPS | A | Upsala Cooperative Telephone Ass’n | 119 Main Street | PO BOX 366 | Upsala | MN | 56384 | 320-630-8057 | MN | Facility |
| UPTEL | A | Upper Peninsula Telephone Company | 397 US 41 N | Carney | MI | 49812-0086 | 906-563-7229 | MI | CLEC | |
| URBAN | OB | (Out of Business) Urban Media | One Kaiser Plaza, Suite 1350 | Oakland | CA | 94612 | 888-648-5662 | ALL | Facility | |
| USA | A | USA Telephone Inc. | PO Box 601546 | Miami | FL | 33162 | 305-944-8383 | FL | Reseller | |
| USAT | A | United Systems Access Telecom, Inc. | 5 Bragdon Lane | Suite 200 | Kennebunk | ME | 04043 | 207-467-9004 | ME | Facility |
| USCA | A | NOVARTIS | 400 Technology Drive, Floor 7 | Cambridge | MA | 02139 | 617-871-4444 | MA | PBX | |
| USCC | C | (Cancelled) United States Cellular Corporation | 8410 West Bryn Mawr Ave. | Suite 700 | Chicago | IL | 60631 | 865/777-7650 | Portions of CA, FL, GA,, IA, ID, IL, IN, KS, MD, MO, NC, NE, | CMRS |
| USD | A | University of San Diego | 5998 Alcala Park | Maher Hall, Room 151 | San Diego | CA | 92110-2492 | 877-227-3824 | CA | PBX |
| USDC | C | (Cancelled) U.S. District Court, Clerk’s Office | 2609 U.S. Courthouse, 601 Market Street | Philadelphia | PA | 19106 | 215-597-7704 | U.S. Courthouse 601 Market Street | PBX | |
| USIT | A | US In Touch | 1840 E Calvada Blvd. #6 | Pahrump | NV | 89048 | 775-513-2831 | NV | Facility | |
| USLD1 | C | (Cancelled) U.S. Long Distance | 9311 San Pedro S-100 | San Antonio | TX | 78216 | 800-460-1111 | USA | Facility | |
| USLEC | C | (Cancelled) U.S. LEC Corp. | 6801 Morrison Blvd. | Charlotte | NC | 28211 | 800-978-7532 | NC, GA, TN, FL, VA, Washington DC, AL, SC, MD, PA, NJ, DE, K | Facility | |
| USLK | A | TDS Metrocom | 30925 Second St. | P.O. Box 327 | Pequot Lakes | MN | 56472-0327 | 608-664-4200 | MN, ND | CLEC |
| USLTN | C | (Cancelled) US LEC/Pinpoint Platform | 401 N. Tryon St. Suite 1000 | Charlotte | NC | 28202 | 800-978-7532 | TN | CLEC | |
| USOL | A | USOL Holdings, Inc. | 10300 Metric Blvd | Austin | TX | 78758 | 800-844-1001 | TX, CO, OR, VA | PSP | |
| USPTO | C | (Cancelled) U.S. Patent and Trademark Office | Remsen Building | 400 Dulany Street | Alexandria | VA | 22313-1450 | 703-308-6667 | USPTO Campus | PBX |
| USTC | A | Union Springs Telephone Co., Inc. | 203 Hardaway Avenue East | Union Springs | AL | 36089 | 334-738-2114 | AL: Union Springs, Perote, Midway, Fort Davis | Facility | |
| USUNW | C | (Cancelled) US Unwired | 901 Lakeshore Drive | Lake Charles | LA | 70601 | 337/310-3121 | TX, LA, AL, FL, MS, AR, TN | Wireless | |
| USWC | C | (Cancelled) Qwest (US West Communications) | 200 S. 5th Street | Room 890 | Minneapolis | MN | 55402 | 800-357-0911 | AZ, CO, ID, IA, MN, MT, NE, NM, ND, OR, SD, UT, WA, WY | Tel. Co. |
| USX | I | (Registration Inactive) US Xchange L.L.C. | 44 Grandville Ave. SW Suite 400 | Grand Rapids | MI | 49503 | 800/525-6775 | IL, IN, WI, MI | Facility | |
| UTC | A | United Telephone Company | 120 Taylor Street | P. O. Box 38P. O. Box 38 | Chapel Hill | TN | 37034 | 931-364-2289 | TN | Facility |
| UTCO | A | Union Telephone Company | 100 West North Street | PO Box 96 | Plainfield | WI | 54966-0096 | 715-335-6301 | WI | ILEC |
| UTEX | A | UTEX Communications Corp. | 1250 South Capital Texas Highway | Building 2, Suite 235 | Austin | TX | 78746 | 281/222-6307 | TX | Facility |
| UTMA | A | United Telephone Mutual Aid Corporation | 411 7th Ave. | PO Box 729 | Langdon | ND | 58249-0729 | 701-256-1100 | ND | Facility |
| UYT | A | Utility Telephone, Inc. | 7277 Pacific Ave, Suite 4 | Stockton | CA | 95207 | 866/788-4548 | California | Facility | |
| VALAZ | A | Valley Telecom Group | 752 E. Maley | Willcox | AZ | 85643 | 800-400-1273 | AZ, NM | LEC | |
| VALED | A | VAL-ED Joint Venture, LLP | 702 Main Ave. | Moorhead | MN | 56560 | 218-284-5702 | MN, ND | Facility | |
| VALL | A | Valley Telephone | 102 Main Street S. | PO Box 7 | Herreid | SD | 57632 | 605/437-2615 | SD | Facility |
| VALOR | A | Valor Telecommunications, LLC | 201 E. John Carpenter Freeway | Suite 200 | Irving | TX | 75062 | 866-616-9900 | TX, OK, NM | Facility |
| VALU | C | (Cancelled) Ionex Telecommunications, Inc | 1950 Stemmons Freeway | Suite 4033 | Dallas | TX | 75207 | 877-333-2555 | TX, KS, MO, OK | CLEC |
| VANE | I | (Inactive) Apollo Communications, LLC | 2790 N. Academy Blvd, Suite 110 | Colorado Springs | CO | 80917 | 866-899-9349 | CO | Facility | |
| VATEN | C | (Cancelled) Virginia RSA 10 Limited Partnership | 124 South Main Street | PO Box 459 | Edinburg | VA | 22824 | 540/984-5220 | VA | Cellular |
| VAUGH | C | (Cancelled) Vaughnsville Telephone | 187 N Water Street | Vaughnsville | OH | 45893 | 419-646-3431 | OH | Facility | |
| VBS | A | Valor Business Solutions | 201 E. John Carpenter Freeway | Suite 200 | Irving | TX | 75062 | 866-616-9900 | TX | Reseller |
| VBTC | A | Van Buren Telephone Company, Inc. | 617 1st Street | P.O. Box 430 | Keosauqua | IA | 52565 | 319-293-3187 | IA | Facility |
| VCELA | C | (Cancelled) Vanguard Cellular Systems, Inc. | 2002 Pisgah Church Rd. | Greensboro | NC | 27455 | 303-581-5782 | FL, KY, ME, NY, OH, PA, WV | Cellular | |
| VCI | A | VCI Company d/b/a Vilaire Communications | 3875 Steilacoom Blvd. SW | Suite A | Lakewood | WA | 98499 | 800-357-0911 | MN | Reseller |
| VCL | A | Virginia Cellular LLC | 121 S. Augusta Street | PO Box 1002 | Staunton | VA | 24401 | 540/801-9049 | Virginia | Facility |
| VCO | C | (Cancelled) Valence Communications Services. | 904 Sunningvale | Richardson | TX | 75081 | 888-239-5266 | TX | Reseller | |
| VCU | A | ValuTel Communications, Inc. | 13809 N Highway 183 | Suite 705 | Austin | TX | 78750 | 505/271-9008 | TX, NM | Reseller |
| VDI | A | Vonics Digital | 140 Second Street | Second Floor | San Francisco | CA | 94105 | 925-785-9768 | VSP | |
| VERIZ | A | Verizon | 125 High St. | Oliver Tower 3143 | Boston | MA | 02110 | 800-773-7911 | MA, NH, VT, ME, RI, NY, NJ, DC, DE, MD, PA, WV, VA, FL, NC, | ILEC |
| VERN | A | Vernon Telephone Cooperative | 103 N. Main Street | PO Box 20 | Westby | WI | 54667 | 608-634-3136 | WI | Facility |
| VFP | I | (Inactive) The Village at Farm Pond | 300 West Farm Pond Road | Framingham | MA | 01702 | 508/628-7700 | Framingham, MA | Facility | |
| VFS | A | VolFirst Services | 235 O’Brien Drive | Crossville | TN | 38557 | 931-668-1000 | Crossville, TN | Facility | |
| VFTC | A | Villisca Farmers Telephone Company | 205 E. 4th Street | Villisca | IA | 50864-1198 | 712-826-2812 | IA | LEC | |
| VHC | A | Virtual Hipster Corporation | 1221 Lovelock Highway | Fallon | NV | 89406 | 775-428-2186 | NV | Facility | |
| VIKCO | A | Viking Communications, Inc. | 600 Route 38 W | Cherryhill | NJ | 08002 | 215/852-9384 | PA, DE, NJ | Reseller | |
| VIMS | A | Virginia Institute of Marine Science | 1375 Greate Road | Gloucester Point | VA | 23062 | 804-684-7000 | VIMS – Gloucester Point, VA | PBX | |
| VIO | I | (Inactive) Vi Lata Communications, LLC | 213 Linden Street | Suite 200 | Ft. Collins | CO | 80524 | 888-424-4611 | CO | Facility |
| VIVID | A | Vivid Networks Inc | 6780 Trade Center Ave | Billings | MT | 59101 | 406-294-9693 | MT | Facility | |
| VIXXI | A | VIXXI Solutions, Inc. | 4545 Fuller Drive | Suite 416 | Irving | TX | 75038 | 303-762-6868 | CO, NY, TX, CA, AZ | Facility |
| VLR | C | (Cancelled) Valor Telecommunications CLEC of TX | 201 E John Carpenter Fwy | Suite 200 | Irving | TX | 75044 | 866-616-9900 | TX | CLEC |
| VLRNM | C | (Cancelled) Valor Business Solutions of NM | 201 E. John Carpenter Freeway, Ste. 200 | Irving | TX | 75062 | 816/651-6257 | NM | Facilities | |
| VNAGE | A | Vonage Holdings, Inc. | 2147 Rte. 27 | Edison | NJ | 08817 | 866-293-5674 | NY,NJ,CA,IL,TX,RI,MA,NH,CT,PA,OH,MI,WA,MN,FL,GA | VoIP | |
| VNHRN | A | Van Horne Cooperative Telephone Company | 204 Main Street | P.O. Box 96 | Van Horne | IA | 52346-0096 | 319-228-8791 | Van Horne, IA | Facility |
| VOA | C | (Cancelled) VOA Associates Incorporated | 224 S Michigan, Suite 1400 | Chicago | IL | 60604-2595 | 800-844-1001 | IL | Facility | |
| VOICE | P | Voiceral Communications, Inc. | 150 Broadway | Suite 303 | Menands | NY | 12204 | 518-618-0000 | All | VoIP |
| VOIP | I | (Inactive) VoIP Corporation | 7091 Grand National Drive | Suite 102 | Orlando | FL | 32819 | 407-402-8675 | Orlando and Miami | Other |
| VOLO | A | Volo Communications | 151 S. Wymore Road | Suite 3000 | Altamonte Springs | FL | 32714 | 407-215-5355 | CA, CT, DE, FL, GA, IL, ID, MD, MA, NH, NC, NY, OH, PA, SC, | Facility |
| VOX | P | VoX Communications | 610 Sycamore Street | Suite 120 | Celebration | FL | 34747 | 866-700-8321 | USA | VoIP |
| VQDP | A | Vacation Quarters at Deer Park | 132 Deer Park Drive | North Woodstock | NH | 03262 | 603-271-6911 | NH | PBX | |
| VRT | A | VarTec Telecom, Inc. | 1600 Viceroy | Dallas | TX | 75235 | 800-705-8929 | All | Facility | |
| VSC | A | Ruddata Corporation/Vision Communication | 523 South Third St. | Paducah | KY | 42003 | 800-755-1239 | McCracken County | Facility | |
| VSL | A | VoIP Services, LLC | Legal Services Division | 200 South 10th Street #400 | McAllen | TX | 78501-4871 | 800-551-1185 | TX | Facility |
| VSPCS | C | (Cancelled – See TMOB) VoiceStream Wireless | 12920 SE 38th St | Bellevue | WA | 98006 | 800/662-4662 | USA | Wireless | |
| VTCI | A | Valley Telephone Cooperative, Inc. | 480 South 6th St. | Raymondville | TX | 78580 | 956-642-1227 | TX | Facility | |
| VTCOM | A | ValleyTelecommunications Company Inc. | 752 W. Maley Street | Wilcox | AZ | 85643 | 800-400-1273 | AZ | Wireless | |
| VTEL | A | Vermont Telephone Company, Inc. | 354 River St. | Springfield | VT | 05156 | 802-885-9001 | VT | LEC | |
| VTIUS | A | Velocity Telephone, Inc. | 4050 Olson Memorial Highway | Suite100 | Golden Valley | MN | 55422 | 763-222-1099 | MN | Facility |
| VTPS | A | Vernon Township Public Schools | 539 Route 515 | PO Box 99 | Vernon | NJ | 07462 | 973-764-2900 | Vernon Twp Public Schools – NJ | PBX |
| VZAVE | C | (Cancelled) Verizon Avenue Corp. | 12901 Worldgate Drive 7th Flr. | Herndon | VA | 20170-5808 | 888-663-7646 | All | Reseller, Facility | |
| VZCOV | A | Verizon/COVA | 600 E. Main Street | 6th Floor | Richmond | VA | 23219 | 804-772-1704 | VA | PBX |
| VZIUH | C | (Cancelled) InTouch Communications | 25371 Comercentre Dr., Suite 200 | Lake Forest | CA | 92630 | 949-280-3387 | CA | Reseller | |
| VZPS | A | Verizon – PS911 Customers | 10402 N. 56th St. – FLTP0997 | Temple Terrace | FL | 33617 | 800-483-0911 | FL,IL,IN,MI,NC,OH,SC,WI,AR,CA,HI,ID,NV,OR,TX,WA | PBX | |
| VZTXC | A | GTE Southwest Inc dba Verizon Southwest | 500 E. Carpenter Freeway | MC: TXD1933E | Irving | TX | 75062 | 800/483-0911 | TX | Facility |
| VZW | A | Verizon Wireless | One Verizon Place | GA3B1REG | Alpharetta | GA | 30006 | 888-611-0029 | ALL | Wireless |
| VZWIT | A | Verizon Communications – WITS 2001 | 2055 L. Street NW | 6th Floor | Washington | DC | 20036 | 800-381-3444 | DC, MD, VA | Facility |
| WACHV | I | (Inactive) Wachovia Securities | 4340 Innslake Drive | MS 3497 | Glen Allen | VA | 23060 | 804-747-2370 | VA | PBX |
| WALNT | A | Walnut Telephone Company | 510 Highland Street | Walnut | IA | 51577 | 712-784-2211 | Pottawattamie & Shelby Counties, IA | Facility | |
| WAR | C | (Cancelled) War Telecommunications Co. | 145 High Street | War | WV | 24892 | 304-875-2211 | City of War | Ind. TelCo | |
| WAREN | I | (Inactive) Warren County Telecom Dept. | 500 Justice Avenue | Lebanon | OH | 45036 | 513-695-1289 | OH | PBX | |
| WAT | A | Wholesale Air-Time | 27515 Enterprise Cir. West | Temecula | CA | 92590 | 800-275-0014 | CA | ||
| WBFS | A | Woodberry Forest School | 10 Woodberry Station | Woodberry Forest | VA | 22989 | 540-672-3900 | VA | PBX | |
| WBI | A | Cinergy Communications | 1419 Lloyd Expressway | Evansville | IN | 47710 | 800-599-6000 | KY, IN | CLEC | |
| WBSHP | C | (Cancelled) WebShoppe Communications, Inc. | 16 Broad Street | Alexander City | AL | 35010 | 205-501-1250 | AL | ICP | |
| WCAR | A | West Carolina Communications, LLC | HWY 28 Bypass | Abbeville | SC | 29620 | 864-446-3111 | SC | Facility | |
| WCC | C | (Cancelled) Waller Creek Communications, Inc. | 1801 N. Lamar, Ste 201 | Austin | TX | 78701 | 512-485-7000 | Austin,TX | Shared Ten | |
| WCLEC | C | (Cancelled) Western CLEC Corp | dba Bus. Serv./Cellular One | 3650 131st Ave SE, Ste. 600 | Bellevue | WA | 98006 | 877-831-9418 | WA | Facility |
| WCOM | C | (Cancelled – see MCI) Worldcom | 2400 N. Glenville | Building A, Cube A3021A | Richardson | TX | 75082 | 800-844-1001 | USA | Facility |
| WCRTC | A | West Carolina Rural Telephone Coop., Inc | PO Box 610 | Abbeville | SC | 29620 | 864-446-3111 | SC | Facility | |
| WCT | A | West Central Telephone Association | 308 Frontage Road | Sebeka | MN | 56477 | 800-945-2163 | MN-Exchanges of Sebeka, Menahga, Verndale, Nimrod, Wolf Lake | Facility | |
| WCTA | A | Winnebago Cooperative Telephone Assoc. | 704 E. Main St. | Lake Mills | IA | 50450 | 800-216-6951 | IA & MN | Facility | |
| WCTC | A | Wood County Telephone Company | 440 East Grand Avenue | PO Box 8045 | Wisconsin Rapids | WI | 54494-8045 | 715/652-3175 | WI | Facility |
| WDY | I | (Inactive) Digital Easy Chair | 1488 E. Blue Tick St. | Meridian | ID | 83642 | 208/888-4039 | ID | Reseller | |
| WEI | A | WilNet Communcations | 116 West Main Street | Ada | OK | 74820 | 877-835-9663 | Ada, OK | Facility | |
| WEST | A | Westlink Communications, L.L.C. | C/O Pioneer Communications | 120 W Kansas Avenue | Ulysses | KS | 67880 | 800-360-7893 | KS | Wireless |
| WESTL | A | Westel, Inc. | 9606 North Mopac | Suite 700 | Austin | TX | 78759 | 800-580-5519 | TX | Facility |
| WETEC | A | WETEC, LLC | 105 3rd St. West PO Box 151 | Park Rapids | MN | 56470-1508 | 218-346-5500 | MN | Facility | |
| WFC | A | Web Fire Communications, Inc. | 3406 McNiel | Wichita Falls | TX | 76308 | 940-691-7577 | Wichita Falls area, Dallas LATA | Facility/Reseller | |
| WHLNK | A | WH LINK | PO Box 330 | 6800 Electric Drive | Rockford | MN | 55373-0330 | 800-344-3730 | Anoka, Wright, Hennepin, Sherburne Counties | Facility |
| WHT | A | Walnut Hill Telephone Company | 120 East First Street | PO Box 729 | Lewisville | AR | 71845 | 870-921-4211 | AR | Facility |
| WHTCS | A | White & Case, LLP | 1155 Avenue of the Americas | IT Department | New York | NY | 10036 | 212-819-8200 | ALL | Facility |
| WHTST | A | Wheat State Telephone | 106 W First St. | Udall | KS | 67146 | 620-782-3341 | KS | ILEC | |
| WIGGI | A | Wiggins Telephone Assn. | 414 South Main Street | P.O. Box 690 | Wiggins | CO | 80654 | 970-483-7343 | CO | Facility |
| WIKST | A | Wikstrom Telephone Co Inc. | 212 South Main Street | Karlstad | MN | 56732-0217 | 218-436-2121 | MN | LEC | |
| WILLM | A | Williams College | 60 Lathan Street | Williamstown | MA | 01267 | 413-735-8255 | MA | PBX | |
| WILTL | C | (Cancelled) Wilton Telephone Company Inc. | 148 Main Street | Wilton | NH | 03086 | 603-654-9911 | NH: Hollis, Wilton | Facility | |
| WILUV | A | Willamette University | Eaton Hall | 990 State Street | Salem | OR | 97301 | 503/370-6300 | Salem, OR | Facility |
| WIN1 | A | SureWest TeleVideo d/b/a SureWest Broadband | 5411 Luce Avenue | McClellan | CA | 95652 | 916-786-1523 | CA | CLEC | |
| WINN | A | Winn Telephone Co. | 2766 W. Blanchard Rd. Box 367 | Winn | MI | 48896 | 517-866-2211 | Fremont Twp., MI | Facility | |
| WINNT | A | Winn Telecom, dba | 402 N. Mission St. Suite 1 | Mt. Pleasant | MI | 48858 | 517-779-9817 | MI counties: Isabella, Gratiot | Facility | |
| WIREG | A | Wiregrass Telecom, Inc. | 1676 Montgomery Hwy | Dothan | AL | 36303 | 888-472-2322 | AL | CLEC | |
| WIRII | C | (Cancelled -see NECCi) Wireless II LLC dba Nebraska Wireless | 2121 N. Webb Road, Ste. 101 | Grand Island | NE | 68803 | 308-370-0007 | NE | Wireless | |
| WITT | A | Wittenberg Telephone Company | 104 W. Walker Street | PO Box 160 | Wittenberg | WI | 54499-0160 | 715-253-2111 | Central Wisconsin | LEC |
| WKC | A | Wilkes Cellular, Inc. | 110 E Liberty St | PO Box 277 | Washington | GA | 30673 | 706-678-9505 | GA | Wireless |
| WKRT | A | West Kentucky Rural Telephone | 237 North 8th Street | PO Box 649 | Mayfield | KY | 42066-0000 | 270-856-1000 | KY, TN | Facility |
| WLIB | A | West Liberty Telephone Co. | 413 W. Calhoun Street413 W. Calhoun Street | West Liberty | IA | 52776-1399 | 319-627-4611 | 319-627 and 319-643 Prefixes (Iowa) | Facility | |
| WLK | A | Wilkes Telephone and Electric Company | 110 E Liberty St | PO Box 277 | Washington | GA | 30673 | 706-678-9505 | GA | Facility |
| WLRD | A | Willard Telephone Company | Rt 2Route 2 | Box 41-A | Merino | CO | 80741 | 970-228-4571 | Community: Willard | ILEC |
| WLTO | A | WTC Communications | 810 West 5th Street810 West Fifth Street | PO Box 970 | Wilton | IA | 52778 | 563-732-3000 | IA | Facility |
| WMA | A | Anew Telecom Corp dba Call America | PO Box 3310 | San Luis Obispo | CA | 93403 | 866-788-4548 | CA | Facility | |
| WNDM | A | City of Windom | 443 10th Street | PO Box 38 | Windom | MN | 56101 | 507-832-8000 | MN | Facility |
| WNSTR | A | Winstar Communications, LLC | 2350 Corporate Park Drive, 1st Floor | Herndon | VA | 20171 | 888-404-0114 | All Winstar Service Areas | Facility | |
| WODN | A | WorldNet, L.L.C. | 1 Riverfront Plaza | Suite 301 | Lawrence | KS | 66044 | 785-312-6965 | KS – Lawrence | CLEC |
| WOODS | A | Woodstock Telephone Company | 337 Aetha PO Box C | Ruthton | MN | 56170 | 800-417-8685 | MN-Lyon, Redwood, Nobles, Pipestone, Murray, Martin, Brown | ILEC | |
| WPT | A | West Plains Telecommunications | 302 Uvalde Street | Muleshoe | TX | 79347 | 806-272-5533 | TX | ILEC | |
| WRT | A | West River Telecommunications Cooperative | 101 West Main Street | PO Box 467 | Hazen | ND | 58545 | 701-748-6700 | ND, SD | Facility |
| WSLK | C | (Cancelled – see “”WEST””) WestLink Communications, LLC | 120 W. Kansas | PO Box 707 | Ulysses | KS | 67880 | 800-360-7893 | KS | Wireless |
| WST | A | West Side Telecommunications | 1449 Fairmont Rd. | Morgantown | WV | 26501 | 304-983-2211 | Laurel point, WV; Daybrook, WV; Core WV | Facility | |
| WSTN | C | (Cancelled) Town of Weston | 56 Norfield Road | Weston | CT | 06883 | 203-222-2600 | Weston, CT | PBX | |
| WTC | A | Westelcom Network Inc. | 17 N. Main Street | Westport | NY | 12993 | 800-982-5463 | NY | Facility | |
| WTCI | A | Wilson Telephone Company, Inc. | 2504 Avenue D | P.O. Box 190 | Wilson | KS | 67490 | 800-432-7607 | KS | LEC |
| WTCMI | A | Westphalia Telephone Company | 109 E. Main Street | Westphalia | MI | 48894 | 989-587-5000 | Westphalia, MI | Facility | |
| WTMC | A | Wilkes Telephone Membership Corporation | 1400 River Street | Wilkesboro | NC | 28697 | 336-957-9439 | NC | Facility | |
| WTRT | A | West Texas Rural Telephone Coop. | 3425 US Highway 385 | PO Box 1737 | Hereford | TX | 79045 | 806-364-5611 | TX | Facility |
| WTSI | A | W.T. Services, Inc. | 3429 US Highway 385 | PO Box 1776 | Hereford | TX | 79045 | 806-364-5611 | TX | Facility |
| WTT | A | Westex Telcom | 1500 W. Business 20 | Stanton | TX | 79782 | 915-263-0091 | Big Spring TX, Stanton TX, Midland/Odessa TX | Facility | |
| WTTEC | A | West Tennessee Telephone Co., Inc. | 224 E. Main Street | Bradford | TN | 38316 | 901-742-2900 | TN | ILEC | |
| WVHL | A | Waverly Hall Telephone, LLC | 7457 Highway 208 | Waverly Hall | GA | 31831 | 706-582-3333 | GA | Facility | |
| WVTC | A | Warwick Valley Telephone Company | 47 Main Street | Warwick | NY | 10990 | 973-764-1111 | NJ, NYNY’s 24X7 number is 845-986-1111 | Facility | |
| WVU | A | West Virginia University | One Waterfront Place | PO Box 6860 | Morgantown | WV | 26506 | PBX | ||
| WVW | A | West Virginia Wireless | 233 Virginia Street | Charleston | WV | 25301 | 304/720-5553 | WV, Boyd County,KY | Wireless | |
| WWCSI | A | 24 / 7 Telcom | P.O. Box 247 | Downsville | WI | 54735 | 715-664-8313 | WI | CLEC, Reseller | |
| WWPCS | I | (Inactive) Western Wireless | 3650 131st Ave. SE Suite 400 | Bellevue | WA | 98006 | 206-541-9574 | MO, ND, SD, WY, ID, MN, NE, IO, KS, MS, OK, AR, TX, NM, CO, | Wireless | |
| WWT | A | Wahkiakum West Telephone | 19 Miller Point Road | P.O. Box 99 | Rosburg | WA | 98643 | 360-465-2211 | QWEST/Wahkiakum & Pacific County, WA | LEC |
| WWTC | A | West Wisconsin Telcom Cooperative | E4528 Cty Rd C | Menomonie | WI | 54751 | 715-664-8313 | WI | Facility | |
| WYETH | C | (Cancelled) Wyeth Nutritionals Inc. | PO Box 2109 | Georgia | VT | 05468 | 802-527-0521 | Wyeth Nutritionals | PBX | |
| WYOM | A | Wyoming Mutual Telephone Company | 150 W. Main Street | P. O. Box 169 | Wyoming | IA | 52362-0169 | 563-488-2535 | Wyoming Iowa Telephone Exchange Jones County | Facility |
| XCH | A | Xchange Telecom | 1428 36th Street | Suite 215 | Brooklyn | NY | 11218 | 877-853-3443 | NY, NJ | Facility |
| XENOI | C | (Cancelled) IONEX | 5710 LBJ Freeway | Suite 215 | Dallas | TX | 75207 | 877-333-2555 | TX, KS, OK, MO | Facility |
| XIT | A | XIT Communications | 12324 HWY 87 North | Dalhart | TX | 79022 | 806-384-3311 | TX | Facility | |
| XOXO | C | (Cancelled) XO Communications | 2637 Summit Ave., Ste. 100 | Plano | TX | 75074 | 800-464-4402 | ALL | Facility | |
| XPC | C | (Cancelled – see ACSI) Xspedius Corp. | 5555 Winghaven Blvd., 3-C – 16-C | O’Fallon | MO | 63366 | 877-322-0414 | LA, MS, AL, FL, TN, NC | Facility | |
| XPT | A | eXpeTel Communications | 2506 Lakeland Drive | Suite 405 | Jackson | MS | 39232 | 800-310-4481 | MS | Facility |
| YAHOO | C | (Cancelled) YaHoo!, Inc. | 721 First Ave | Sunnyvale | CA | 94086 | 800-464-4402 | ALL | PBX | |
| YALE | A | Yale University | 221 Whitney Ave | 3rd Floor | New Haven | CT | 06511 | 203-785-4171 | CT | PBX |
| YATES | A | Yates County Buildings & Grounds | 417 Liberty St., Suite 0017 | Penn Yan | NY | 14527 | 315-536-4438 | OTHER | PBX | |
| YCC | A | Yucca Communications | 201 W. Second St. | P.O. Box 867 | Portales | NM | 88130 | 505-359-1273 | NM | Reseller |
| YCI | A | Yorkville Telephone Cooperative | 4 Newbern Highway | Yorkville | TN | 38389 | 901-643-6121 | TN, KY | Facility | |
| YCOM | A | YCOM Networks, Inc. | 105 2nd Street, SE | Yelm | WA | 98597 | 360/458-7701 | Yelm, Rainier, small portion of Roy | Facility | |
| YCTC | A | Yell County Telephone Company | 126 E 7th St | Danville | AR | 72833 | 501-495-3113 | AR | Facility | |
| YTC | A | Yorkville Telephone Cooperative | 4 Newbern Highway | Yorkville | TN | 38389 | 901-643-6121 | TN | Wireless | |
| YVS | A | PBT d/b/a Comporium Communications | 245 E. Main Street | PO Box 12100 | Rock Hill | SC | 29730 | 803-324-9001 | SC | Facility |
| YVT | A | Yadkin Valley Telecom, Inc | P.O. Box 368 | Yadkinville | NC | 27055 | 336-463-5047 | NC | Facility | |
| YVTMC | A | Yadkin Valley Telephone | P.O. Box 368 | Yadkinville | NC | 27055 | 336-463-5047 | NC | Facility | |
| YWTCO | A | Yukon Waltz Telephone Co. | Huntingdon Rd. PO Box 398 | Yukon | PA | 15698-0398 | 724-722-3131 | Yukon, PA | Facility | |
| ZENDA | A | Zenda Telephone Company, Inc. | 208 N. Main | PO Box 128 | Zenda | KS | 67159 | 620-243-2892 | KS | Facility |
| ZENK | A | ZENK Group d/b/a Planet Access | 26400 Southfield Road | Lathrup Village | MI | 48076 | 800-500-6140 | MI | Facility/Reseller | |
| ZIPPY | P | ZippyTech, Inc. | 10 Town Plaza | #152 | Durango | CO | 81301 | 970-385-2500 | CO | CLEC Facility |
| ZNGO | P | Zingo Telecom, Inc. | 2929 E. Commercial Blvd. | Suite 610 | Ft. Lauderdale | FL | 33062 | 561-866-6561 | All | Reseller |
| ZTEL | A | Z-Tel Communications | 601 S. Harbour Island Boulevard Suite 220 | Tampa | FL | 33602 | 800-275-0014 | CA, NV | CLEC |