Phone numbers in Cornwall, Connecticut
Cornwall has 7 phone prefixes in area codes 860, 959.
Biggest holders: Level 3 (Lumen), MCImetro (Verizon Business), Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 14%
- Internet / business phone carrier 71%
Every prefix in Cornwall
Search the first six digits of a number in this list. If it's here, the number started in Cornwall with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 860-248 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 860-318 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 860-419 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 860-499 | Teleport Communications America | Internet / business phone carrier | – |
| 860-671 | AT&T Mobility | Mobile carrier | – |
| 860-672 | AT&T (local phone) | Local phone company | – |
| 959-228 | Onvoy | Internet / business phone carrier | 2021 |
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.