| CoID | Company | Type | Status | States Served | 24X7 Phone |
|---|---|---|---|---|---|
| HBRD | Hubbard Cooperative Telephone Assn. | ILEC | A | IA | 641-864-2273 |
| HBSD | Hampton Bays UFSD | VoIP | A | NY | 631-806-1598 |
| HBTC | Hillsboro Telephone Company | Facility | A | WI | 608-489-3230 |
| HCA | HCA Healthcare - WFD - CANCELLED | PBX/PS911/Shared Tenant | C | USA - Nationwide | 813-390-8667 |
| HCAA | Hillsborough County Aviation Authority | 9-1-1 Admin-CPE ALI | CLEC Facility | CLEC Reseller | PBX/PS911/Shared Tenant | A | FL | 813-870-8770 |
| HCARS | Handy Cars | PBX/PS911/Shared Tenant | A | USA - Nationwide | 802-355-1693 |
| HCC | Hood Canal Communications | ILEC | A | Mason County | WA | 360-898-2481 |
| HCCCC | Hillsborough County Clerk of the Circuit Court | Internet Protocol Relay Provider VoIP Provider | A | FL | 813-276-2029 |
| HCCIL | Heartland Community College | PBX/PS911/Shared Tenant | A | IL | 309-261-0389 |
| HCGMD | Harford County Government | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MD | 443-617-8537 |
| HCGOV | Howard County Government | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) Internet Protocol Relay Provider | A | MD | 410-313-2950 |
| HCI | Hiawatha Telephone Company Ontonagon County Telephone Compa | ILEC | A | MI | 800 562-9741 |
| HCINS | HCI Investment Company (INACTIVE) | CLEC Facility | C | NE | 712-252-3800 |
| HCN | Hypercore Networks Inc | VoIP Reseller VoIP Provider | A | USA - Nation Wide | 8005972518 |
| HCOLL | Highline College - CANCELLED | PBX/PS911/Shared Tenant | C | WA | 253-561-2452 |
| HCOM | Headland Communications | VoIP Provider | A | USA - Nationwide | 415-200-0400 x1 |
| HCOMM | Hunter Communications | CLEC Facility | VoIP Provider | A | OR | 541-734-2800 x4 |
| HCPS | Harrisonburg City Public Schools | VoIP Provider | A | VA | 540-434-9916 |
| HCPSS | Howard County Public School System | PBX/PS911/Shared Tenant | A | MD | 410-456-6570 |
| HCS | Hinesburg Community School | PBX/PS912/Shared Tenant | A | VT | 802-825-1919 |
| HCSD | Hannibal Central School District - CANCELED | PS/ALI Management | C | NY | 315-564-8100 |
| HCSMI | Hesperia Community Schools | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | A | MI | 231-854-6185 |
| HCSVA | Hampton City Schools | PBX/PS911/Shared Tenant | A | VA | 757-449-7184 |
| HCTC | Hershey Cooperative Telephone Company | Facility | A | NE | 308-368-5561 |
| HCTCO | Hamilton County Telephone Co-op and Futiva LLC | CLEC Facility ILEC | A | IL | 618-736-2211 |
| HCTR | Howard Center Inc. | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant | A | VT | 802-488-6999 |
| HCUNY | Hunter College | 646-302-6912 | NY | 646-302-6912 | |
| HDRHC | L A County Regional Health Center | PBX/PS911/Shared Tenant | A | CA | 661-471-4000 |
| HDT | Hawaii Direct Telephone (Cancelled) | PBX | C | HI | 808-864-3779 |
| HDTC | Hawaii Direct Telephone Company | CLEC Facility | PBX/PS911/Shared Tenant | VoIP Proiver | A | USA | 808-440-8700 |
| HEAVY | HeavyLogic | PBX/PS911/Shared Tenant | A | USA - Nationwide | 855-588-1024 |
| HEMG | Hemingford Co-op Telephone Co | ILEC | A | NE | 308-487-3311 |
| HEND | Henderson Cooperative Telephone Company | Facility | A | York & HamiltonCounties in NE | 402-723-4448 |
| HENR | HENRY COUNTY TELEPHONE COMPANY | ILEC | A | IL | 309-944-2103 |
| HERCO | Hershey Entertainment & Resorts - CANCELLED | PBX/PS911/Shared Tenant | C | PA | 717-508-5943 |
| HESS | HESS Corp - CANCELLED | PBX/PS911/Shared Tenant | VoIP Provider | C | TX | 713-496-5000 |
| HESVT | Highgate Elementary School | PBX/PS911/Shared Tenant | A | VT | 802-868-4170 |
| HEWIT | AON/Hewitt Inc - CANCELLED | VoIP | C | NY | VA | IL | 800-333-9873 |
| HFDCT | City of Hartford | PBX/PS911/Shared Tenant | A | CT | 860-550-3234 |
| HFI | Health First Inc. - CANCELLED | PBX/PS911/Shared Tenant | C | FL | 321-434-5000 |
| HFSD | Hampton Falls School District | PBX/PS911/Shared Tenant | A | NH | 603-926-2539 |
| HFUIS | Holy Family University - CANCELLED | PBX/PS911/Shared Tenant | C | PA | 267-341-3002 |
| HHC | Hartford HealthCare - CANCELLED | PBX/PS911/Shared Tenant | C | CT | 860-545-2147 |
| HHCC3 | Hickory Hills Communications Center - CANCELLED | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) | C | IL | 708-598-1313 |
| HHCHH | Hartford Hospital | PBX/PS911/Shared Tenant | A | CT | 860-545-5000 |
| HHMI | Howard Hughes Medical Institute - CANCELLED | PBX/PS911/Shared Tenant | C | MD | 301-215-8990 |
| HHS | Holzer Health System | 9-1-1 Admin-CPE ALI (9-1-1 Jurisdiction/PSAP ONLY) PBX/PS911/Shared Tenant | A | OH | 740-446-5000 |
| HHSIP | HHS - CANCELLED | VoIP Provider | C | DC | MD | VA | 301-435-3889 |
| HHX | Hearing Help Express Inc. | PBX/PS911/Shared Tenant | A | IL | 815-761-7167 |
| HIC | Heart of Iowa Communications Cooperative | CLEC Facility ILEC | A | IA | 641-486-2211 |