Phone numbers in DeWitt, Michigan
DeWitt has 6 phone prefixes in area code 517.
Biggest holders: Frontier, Westphalia Broadband, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 50%
- Internet / business phone carrier 33%
- Phone company 17%
Every prefix in DeWitt
Search the first six digits of a number in this list. If it's here, the number started in DeWitt with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-239 | Frontier | Local phone company | 2015 |
| 517-277 | Westphalia Broadband | Internet / business phone carrier | 2004 |
| 517-624 | Onvoy | Internet / business phone carrier | 2006 |
| 517-668 | Frontier | Local phone company | – |
| 517-669 | Frontier | Local phone company | – |
| 517-949 | Acd Telecom | Phone company | 2001 |
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.