Phone numbers in Onondaga, Michigan
Onondaga has 6 phone prefixes in area code 517.
Biggest holders: Voip Innovations, Frontier, Interactive Services Network. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 17%
- Internet / business phone carrier 50%
- Phone company 33%
Every prefix in Onondaga
Search the first six digits of a number in this list. If it's here, the number started in Onondaga with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-471 | Voip Innovations | Internet / business phone carrier | 2026 |
| 517-628 | Frontier | Local phone company | – |
| 517-766 | Interactive Services Network | Internet / business phone carrier | 2001 |
| 517-785 | 123.NET | Phone company | 2002 |
| 517-910 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 517-957 | Acd Telecom | 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.