| CoID | Company | Type | Status | States Served | 24X7 Phone |
| 911CR | 911 Computer Repair | PBX/PS911/Shared Tenant VoIP Reseller VoIP Provider | A | USA - Nationwide | 801-610-6000 |
| 911KK | 911 Secure LLC | Other (must identify below) | Enhanced 911 Service Provider | A | USA - Nationwide | 626-430-8100 |
| 95661 | ClearCaptions LLC | Internet Protocol Relay Provider VoIP Provider | A | USA - Nationwide | 888-316-9822 |
| @LINK | @LINK Services LLC | VoIP | A | OK | 405-202-3059 |
| A1SD | Aledo Independant School District | PBX | C | TX | 817-207-3051 |
| AAAIE | AAA NCNU Insurance Exchange - CANCELLED | PRI | C | USA | 877-554-2911 |
| AAANE | AAA Northern New England | ILEC | A | ME | NH | VT | 207-831-4575 |
| AACC | Anne Arundel Community College | ILEC Wireless/Cellular/PCS VoIP Provider | A | MD | 410-777-1818 |
| AACOU | Anne Arundel County Government | PBX/PS911/Shared Tenant | A | MD | 410-222-8610 |
| AARNG | Arkansas Army National Guard - CANCELLED | CLEC Faciility | C | USA | 501-590-5735 |
| AATI | Spectrotel (formerly Plan B Communications) | Facility | A | NY | 888-773-9722 |
| ABAND | Airband Communications - CANCELLED | VoIP Provider | C | USA | 800-843-2263 |
| ABCWO | AbbVie Bioresearch Center - CANCELLED | PBX/PS911/Shared Tenant | C | MA | 508-849-2604 |
| ABIOS | Applied Bio Systems - CANCELLED | ILEC | C | CA | 480-719-8556 |
| ABMC | Advocate BroMenn Medical Center | PBX/PS911/Shared Tenant | A | IL | 309-268-2580 |
| ABN | Bestline Communications LP | CLEC Facility CLEC Reseller CLEC UNE | A | TX | 5123289095 |
| ABQ26 | Net-Tel Corporation (Cancelled) | CLEC | C | NY, Chicago, Los Angeles | 800-561-2903 |
| ABS | Adelphia Business Solutions (Cancelled) | CLEC | C | PA | 800-292-2314 |
| ABSTX | ABS TALKX INC | VoIP Reseller | A | USA - Nation Wide | 516-445-4000 |
| AC001 | Aureon Communications L.L.C. (formally Alliance Connect) | CLEC Reseller VoIP Reseller VoIP Provider | A | IL | IA | MN | MO | NE | 515-830-0629 |
| ACAA | Allegheny County Airport Authority | VoIP | A | Pittsburgh International Airport | 800-773-7911 |
| ACAD | Acadia National Park | VoIP Provider | A | ME | 207-610-0648 |
| ACAT | Aventure Communication & Technology - CANCELLED | CLEC Facility | VoIP | C | IA | NE | SD | 712-255-3085 |
| ACC | Akron Canton Communications (Cancelled) | Reseller | C | OH | 330-699-5699 |
| ACCB | Arrowhead Communications Corp. | LEC | A | US | 800-992-8857 |
| ACCES | Accessible Wireless (CANCELLED) | Wireless | C | CA, AZ | 949-439-2888 |
| ACCIP | Accipiter Communications Inc. | ILEC | A | AZ | 623-455-4500 |
| ACDC | Adept Communication and Data Company Inc | VoIP Reseller VoIP Provider | A | USA - Nationwide | 240-674-9422 |
| ACDEL | ACD Telecom | Facility | A | MI | 517-999-9999 |
| ACE | ACE Hardware Corporation | PBX/PS911/Shared Tenant | A | IL | 815-872-3000 |
| ACECM | Ace Telephone Association dba AcenTek | ILEC | A | MN | IA | 507-896-3107 |
| ACEIN | ACE Innovative Networks | VoIP Provider | A | USA | 212-931-9034 |
| ACELK | Ace Link Telecommunciations Inc dba AcenTek | CLEC Facility | A | MN | 507-896-3107 |
| ACEMI | Ace Telephone Company of MI Inc | ILEC | A | MI | 507-896-3107 |
| ACG | Advanced Communicatons Group (Out of Business) | CLEC | C | TX, KS, MO, OK | 877-333-2555 |
| ACG01 | Arlington County | PBX/PS911/Shared Tenant | A | VA | 703-558-2222 |
| ACI | ALLTEL Communications, Inc. (Cancelled - see WINC) | Facility | C | ALL | 800-392-0186 |
| ACIW | Alltel Communications Inc. - CANCELLED | Wireless/Cellular/PCS | C | ALL | 501-607-4594 |
| ACME | Acme Communications Inc. | Facility | A | IN | 219-879-6600 |
| ACN61 | Arrival Communications (CANCELLED) | CLEC Facility | C | CA | 800-851-6705 |
| ACNDP | ACN Digital Phone Service LLC - CANCELLED | VoIP | C | USA | 866-662-6645 |
| ACOLL | Austin College(Cancelled) | CLEC Facility, ILEC, VoIP | C | TX | 903-813-2555 |
| ACOMM | Access Communications, LLC (INACTIVE) | CLEC Reseller, CLEC UNE | C | FL | 904-463-6500 |
| ACONA | Accoona Global LLC | VoIP Reseller VoIP Provider | A | USA - Nation Wide | 682-400-4800 |
| ACPS | Appomattox County Public Schools | VoIP Provider | A | VA | 434-664-8984 |
| ACS | Arvig Communication Systems, Inc. (INACTIVE) | LEC, CLEC | C | MN | 218-346-5500 |
| ACSAK | Alaska Communications Systems - CANCELLED | ILEC VoIP Provider | C | AK | 907-564-1642 |
| ACSI | Xspedius Management Company (CANCELLED) | Facility | C | AL, AR, AZ, CO, DC, FL, GA, KS, KY, LA, MD, MO, MS, NC, NM, | 800-937-7473 |
| ACT | Advanced Communications Technology Inc. | Facility | A | Sheridan | WY | 307-675-0900 |
| ACTCI | Absaraka Cooperative Telephone Co. Inc. | ILEC | A | ND | 701-896-3404 |