Phone numbers in Keweenaw, Michigan
Keweenaw has 3 phone prefixes in area code 906.
Biggest holders: AT&T (local phone), Interactive Services Network, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Keweenaw
Search the first six digits of a number in this list. If it's here, the number started in Keweenaw with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 906-289 | AT&T (local phone) | Local phone company | – |
| 906-312 | Interactive Services Network | Internet / business phone carrier | – |
| 906-331 | Onvoy | Internet / business phone carrier | – |
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.