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34 prefixes in 231 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 231-220 | MUSKEGON | 2550 | 2003-03-25 | Yes |
| 231-440 | BALDWIN | 2550 | 2002-08-27 | Yes |
| 231-441 | FIFE LAKE | 2550 | 2002-08-27 | — |
| 231-488 | MANISTEE | 2550 | 2002-08-27 | — |
| 231-520 | CHARLEVOIX | 2550 | 2002-08-27 | — |
| 231-522 | LUTHER | 2550 | — | — |
| 231-538 | FREMONT | 2550 | 2002-08-27 | Yes |
| 231-568 | TRAVERSECY | 2550 | — | — |
| 231-583 | LUDINGTON | 2550 | 2002-08-27 | Yes |
| 231-614 | PENTWATER | 2550 | — | — |
| 231-635 | MACKINAWCY | 2550 | 2002-08-27 | — |
| 231-636 | HOWARDCITY | 2550 | 2002-08-12 | Yes |
| 231-639 | BEULAH | 2550 | 2002-08-27 | — |
| 231-643 | MORLEY | 2550 | 2002-08-27 | Yes |
| 231-656 | KALKASKA | 2550 | 2002-08-27 | — |
| 231-660 | BIG RAPIDS | 2550 | 2002-08-27 | Yes |
| 231-686 | FRANKFORT | 2550 | 2002-08-27 | — |
| 231-721 | HART | 2550 | 2002-08-27 | Yes |
| 231-731 | SHELBY | 2550 | — | — |
| 231-776 | PETOSKEY | 2550 | 2002-08-27 | — |
| 231-778 | TRAVERSECY | 2550 | 2002-08-27 | — |
| 231-782 | CHEBOYGAN | 2550 | 2002-08-27 | — |
| 231-792 | MANCELONA | 2550 | 2002-08-27 | — |
| 231-806 | CORAL | 2550 | 2002-08-27 | — |
| 231-808 | CENTRAL LK | 2550 | 2002-08-12 | — |
| 231-813 | LUDINGTON | 2550 | — | — |
| 231-836 | EVART | 2550 | 2002-08-27 | — |
| 231-842 | CADILLAC | 2550 | 2002-08-27 | — |
| 231-874 | WOLVERINE | 2550 | 2002-08-27 | — |
| 231-877 | NORTHPORT | 2550 | — | — |
| 231-899 | NORTHPORT | 2550 | 2002-08-27 | — |
| 231-908 | MCBAIN | 2550 | 2002-08-27 | — |
| 231-925 | SCOTTVILLE | 2550 | 2002-08-27 | Yes |
| 231-974 | GRANT | 2550 | 2002-08-27 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.