Phone numbers in Ontonagon, Michigan
Ontonagon has 3 phone prefixes in area code 906.
Biggest holders: AT&T Mobility, Range Telecommunications, Ontonagon County Tel. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Phone company 67%
Every prefix in Ontonagon
Search the first six digits of a number in this list. If it's here, the number started in Ontonagon with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 906-390 | AT&T Mobility | Mobile carrier | – |
| 906-673 | Range Telecommunications | Phone company | – |
| 906-884 | Ontonagon County Tel | Phone company | – |
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.