| CoID | Company | Type | Status | States Served | 24X7 Phone |
| AGLNT | Agilent Technologies - CANCELLED | PBX/PS911/Shared Tenant | C | CA | 866-787-3937 |
| AGORA | Wall Street Daily - CANCELLED | PBX/PS911/Shared Tenant | C | FL | MD | 410-864-1677 |
| AGR | Americas Gardening Resource dba Gardener's Supply Co | PBX/PS911/Shared Tenant | A | NH | VT | 802 316-6136 |
| AGTEL | Alhambra-Grantfork Telephone Company | ILEC | A | IL - Alhambra Village | Grantfork Village | 618-488-2165 |
| AGW | Airgate Wireless, Inc. (Out of Business) | Wireless | C | SC, NC, GA | 888-859-1400 |
| AHC | Allan Hancock College | CLEC Reseller | A | CA | 805-346-1007 |
| AHF | Castleberry Telephone Co Inc. | ILEC | A | AL | 251-966-2118 |
| AHLMH | Ahlstrom-Munksjo Filtration LLC | PBX/PS911/Shared Tenant | A | PA | 717-385-6843 |
| AHLTV | Ahlstrom Filtration LLC | PBX/PS911/Shared Tenant | A | IL | 217-827-1418 |
| AHORG | Adventist Health - CANCELLED | PBX/PS911/Shared Tenant | C | CA | HI | OR | WA | 707-277-1143 |
| AHOSP | Albemarle Hospital - CANCELLED | PBX | C | NC | 252-335-0531 |
| AHS01 | Atlantic Health System - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | NJ | 201-230-5712 |
| AICIL | Allstate Insurance Company - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 847-402-3760 |
| AICNH | Albany International Corp | PBX/PS911/Shared Tenant | A | NH | NY | SC | TX | WI | 603-330-5800 |
| AIN | Access Integrated Networks | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) CLEC Facility CLEC Reseller CLEC UNE VoIP Reseller VoIP Provider | A | USA | 877-727-2117 |
| AINC | Afni Inc | PBX | A | AL | AZ | Co | IL | KY | 800-767-2364 |
| AIPSO | AIPSO(Cancelled) | VoIP | C | RI | 401-528-1303 |
| AIRLK | AirLink Telephone (Cancelled) | Wireless | C | MI | 616-618-2040 |
| AIRPK | AIRPEAK Communications LLC (Cancelled) | Wireless | C | NV, CA, WA, NM | 775-828-7000 |
| AIRUS | Airus Inc. | VoIP Provider | A | USA - Nation Wide | 952-777-1703 |
| AIRWV | Airwave Wireless LLC - CANCELLED | Wireless/Cellular/PCS | C | SD | 605-778-6221 |
| AISD | Allen Independent School District | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | TX | 469-223-3548 |
| AISIN | Aisin Mfg Illinois - CANCELLED | PBX/PS911/Shared Tenant | C | IL | 618-998-2079 |
| AITC | Austen Consultants | PBX/PS911/Shared Tenant | A | USA - Nationwide | 817-989-6400 |
| 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 dba AccessLine- CANCELLED | VoIP Reseller | 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. - CANCELLED | CLEC Facility | VoIP | C | 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 |
| ALLEG | Allegiant Technology | VoIP Reseller VoIP Provider | A | USA - Nationwide | 913-599-6900 |
| ALLO | Allo Communications LLC | Facility | A | Scottsbluff | NE | 816-716-7224 |
| ALLSV | Alltech Computer & IT Services Inc | VoIP Reseller | A | USA - Nationwide | 844-255-8324 |
| 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 |