| CoID | Company | Type | Status | States Served | 24X7 Phone |
| AJF | Aero Communications LLC | CLEC Facility | CLEC Reseller | CLEC UNE | A | IL | KY | 270-448-4247 |
| AJJ | Alta Municipal Utilities (Altatec) | Facility | A | IA | 712-200-1122 |
| AJRED | Aerojet Redmond Operations; dialtone by Verizon(Cancelled) | PBX/PS911/Shared Tenant; VoIP | C | WA | 800-773-7911 |
| AKABI | Akabis LLC | VoIP Provider | A | USA | 866-312-1070 |
| AKDIG | Alaska Digitel (Cancelled) | Wireless/Cellular/PCS | C | AK | 907-244-2125 |
| ALB | Albany Mutual Telephone Association | ILEC | A | MN | 320-845-2101 |
| ALC | Intermedia (formerly AccessLine) - CANCELLED | VoIP Reseller VoIP Provider | C | USA - Nation Wide | 206-654-1030 |
| ALCAL | Athens-Limestone County 911(Inactive) | 9-1-1 Admin-CPE ALI | C | AL | 256-230-2620 |
| ALCI | WCI d/b/a Logix Communications (Cancelled - See LOGIX) | Facility | C | TX | 713-850-0990 |
| ALEC | ALEC Inc. | CLEC Facility | VoIP | A | KY | TN | NC | GA | FL | MS | AL | SC | TX | OH | 866-709-8030 |
| ALGN | Algona Municipal Utilities | CLEC | A | IA | 515-295-3584 |
| ALLBD | Allband Communications Cooperative | ILEC | A | MI | 989-369-9999 |
| ALLCC | Alliance Communications | ILEC | A | SD | MN | IA | 605-594-3411 |
| ALLO | Allo Communications LLC | Facility | A | Scottsbluff | NE | 816-716-7224 |
| ALLTL | ALLTEL Communications Inc (Cancelled - See WIN) | Facility | C | OH, PA, NY, VA, WV, TN, KY | 800-782-6206 |
| ALLU | All Utilities, LLC (Out of Business) | Switch | C | Cherfield | 804-359-3711 |
| ALMA | Alma Telephone Company | ILEC | A | MO | 660-674-2297 |
| ALMAC | Alma College | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MI | 989-463-7777 |
| ALNT | Alltel Communications, Inc. (Cancelled) | Facility | C | NE, IA, KS | 800-678-7169 |
| ALOHA | Bing Enterprises - CANCELLED | VoIP | C | HI | 808-356-2901 |
| ALPBK | Alpine Bank & Trust Co. - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 815-298-1697 |
| ALPHA | Alpha Phone, Inc (INACTIVE) | Facility | C | LATA 132 | 718-436-4919 |
| ALPIN | Alpine Communications | ILEC | A | IA | 800-635-1059 |
| ALPMI | Alpine-Michigan (Cancelled) | Cellular | C | MI, MA | 800-968-7335 |
| ALT | Venus Telephone Co. | ILEC | A | Counties: Venango | Clarion | Forest | 814-354-6123 |
| ALTEA | ALTEA USA (INACTIVE) | Reseller | C | US, Canada | 888-242-5832 |
| ALTEL | Allied Telecom Group LLC - CANCELLED | ILEC | VoIP Provider | C | DC | MD | VA | 202-349-0440 |
| ALTEV | Alteva | VoIP Provider | A | USA - Nation Wide | 877-258-3828 |
| ALTI | Allegiance Telecom Inc. - CANCELLED | CLEC Facility | VoIP Provider | C | USA | 800-421-3872 |
| ALTVX | Altavox Telecom Inc - CANCELLED | VoIP Reseller VoIP Provider | C | USA | 877-743-9128 |
| ALU | Alcatel-Lucent Enterprise - CANCELLED | PBX/PS911/Shared Tenant | C | USA | 877-729-7299 |
| ALVOI | Allvoi - CANCELLED | VoIP Provider | C | USA | 516-960-0760 |
| ALWIR | Alambama Wireless, Inc. (Out of Business) | Cellular | C | AL-Morgan, Cullman, Blount, Lawrence, Franklin, Marion, and | 256-308-2922 |
| ALZ | Alianza | VoIP Provider | A | USA | 801-717-1230 |
| AMATL | AMA Communications LLC dba AMA TechTel Communications | Facility | A | TX | 806-322-2222 |
| AMAVK | American AVK Company - CANCELLED | PBX/PS911/Shared Tenant | C | NV | 775-309-7367 |
| AMBT | American Broadband & Telecommunications | CLEC Facility CLEC Reseller | A | IL | IN | MI | OH | PA | WV | WI | 419-290-1033 |
| AMC | American MetroComm (Out of Business) | CLEC | C | LA | 504-200-2118 |
| AMCC | Ashford Meadows Cable & Comm (Cancelled) | CLEC | C | VA | 804-288-5500 |
| AMCCC | AMCOM Communications Corporation - CANCELLED | Reseller | C | CA | 714-307-1777 |
| AMCEL | American Cellular Wireless (CANCELLED) | WSP | C | TN4,KY4,KY6,KY8,NY5,NY6,MN6,MN2,MN3,MN4,OH7,WV1,WV2,PA9 | 423-318-2139 |
| AMCI | Ameritech Cellular Services (Cancelled) | Cellular | C | IN, IL, WI, OH, MI, MO | 847-765-5300 |
| AMCOM | American Com - CANCELLED | Reseller | C | CO | 877-410-1663 |
| AMCVA | Augusta Medical Center (CANCELLED) | Hospital | C | VA | 540-332-4000 |
| AMERE | Ameren Corp - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 314-206-0662 |
| AMERI | AmeriMex Communications Corp - CANCELLED | CLEC Facility | CLEC Reseller | CLEC UNE | C | AL | FL | GA | KY | NC | SC | 404-392-1999 |
| AMG | Affiliated Managers Group Inc - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | MA | 617-747-3371 |
| AMH01 | Amherst College | PBX | A | MA | 413-542-5823 |
| AMHST | Town of Amherst MA - CANCELLED | VoIP | C | Amherst | MA | 413-259-3000 |
| AMHT1 | Amherst County | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | VA | 434-946-9300 |