| 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 | Co-Op/Rural | A | MN | 320-845-1004 |
| ALC | Intermedia.net Inc.- 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 |
| ALCTY | Peninsula Fiber Network LLC | CLEC Facility | A | MI | 906-232-1003 |
| ALE | Alenco Communications Inc. | ILEC | A | TX | 817-228-2937 |
| 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 |
| ALGPS | Peninsula Fiber Network | CLEC Facility | A | MI | 906-226-2010 |
| ALKMA | Alkermes | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MA | 781-701-3883 |
| ALKOH | Alkermes | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | OH | 937-655-4139 |
| ALLBD | Allband Communications Cooperative | CLEC Facility Co-Op/Rural ILEC VoIP Reseller VoIP Provider | 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 |
| ALLIT | All IT LLC | VoIP Provider | A | FL | 561-508-8666 |
| 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 | 660-641-2296 |
| 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 |
| ALRB | Air Link Rural Broadband LLC | VoIP Provider | A | MO | 660-722.4566 |
| ALSD | Alexander Local School District | PBX/PS911/Shared Tenant | A | OH | 740-707-5918 |
| ALT | Venus Telephone Co. | ILEC | A | Counties: Venango | Clarion | Forest | 814-354-6123 |
| ALTCO | Altitude Communications | VoIP Reseller VoIP Provider | A | USA - Nationwide | 403-538-8888 |
| ALTEA | ALTEA USA (INACTIVE) | Reseller | C | US, Canada | 888-242-5832 |
| ALTEL | Allied Telecom Group LLC | ILEC | VoIP Provider | A | DE | DC | MD | VA | 202-349-0440 |
| ALTEV | Alteva - Cancelled (See MOMTM) | VoIP Provider | C | USA - Nation Wide | 877-258-3828 |
| ALTGN | Altigen Communications Inc - CANCELLED | PBX/PS911/Shared Tenant VoIP Provider | C | USA - Nationwide | 408-597-9000 |
| ALTI | Verizon Business | VoIP Provider | A | USA - Nationwide | 800-483-0911 |
| ALTUS | Altus | VoIP Reseller VoIP Provider | A | USA - Nationwide | 615-465-4001 |
| ALTVX | Altavox Telecom Inc - CANCELLED | VoIP Reseller VoIP Provider | C | USA | 877-743-9128 |
| ALU | Alcatel-Lucent Enterprise | PBX/PS911/Shared Tenant | A | USA - Nationwide | 650-385-2193 |
| 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 |
| AMACA | AMADOR COUNTY CA | PBX/PS911/Shared Tenant | | CA | 209-223-6591 |
| 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 |