Phone numbers in Mackinawcy, Michigan
Mackinawcy has 5 phone prefixes in area code 231.
Biggest holders: Interactive Services Network, AT&T Enterprises, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 20%
- Internet / business phone carrier 40%
- Phone company 40%
Every prefix in Mackinawcy
Search the first six digits of a number in this list. If it's here, the number started in Mackinawcy with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 231-319 | Interactive Services Network | Internet / business phone carrier | – |
| 231-427 | AT&T Enterprises | Phone company | 2011 |
| 231-436 | AT&T (local phone) | Local phone company | – |
| 231-635 | 123.NET | Phone company | 2002 |
| 231-977 | Fractel | Internet / business phone carrier | 2020 |
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.