Phone numbers in McHenry, Illinois
McHenry has 24 phone prefixes in area codes 779, 815.
Biggest holders: Level 3 (Lumen), AT&T (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 21%
- Local phone company 21%
- Internet / business phone carrier 46%
- Paging service 4%
- Phone company 8%
Every prefix in McHenry
Search the first six digits of a number in this list. If it's here, the number started in McHenry with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-244 | AT&T Mobility | Mobile carrier | 2017 |
| 779-265 | Level 3 (Lumen) | Internet / business phone carrier | 2019 |
| 779-378 | Onvoy | Internet / business phone carrier | 2023 |
| 779-403 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 779-639 | TON80 Communications | Internet / business phone carrier | 2022 |
| 779-704 | MCImetro (Verizon Business) | Internet / business phone carrier | 2013 |
| 815-271 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 815-307 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-322 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-331 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-344 | AT&T (local phone) | Local phone company | – |
| 815-349 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 815-363 | AT&T (local phone) | Local phone company | – |
| 815-385 | AT&T (local phone) | Local phone company | – |
| 815-388 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 815-403 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 815-430 | First Communications | Phone company | – |
| 815-528 | Teleport Communications America | Internet / business phone carrier | – |
| 815-578 | AT&T (local phone) | Local phone company | – |
| 815-669 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-679 | Rcn Telecom Services Of Illinios | Phone company | – |
| 815-759 | AT&T (local phone) | Local phone company | – |
| 815-900 | AT&T Mobility | Mobile carrier | 2010 |
| 815-903 | American Messaging Services | Paging service | 2002 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.