MICHIGAN BELL TEL CO
72 prefixes in 231 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 231-213 | TRAVERSECY | 9323 | 2015-03-26 | Yes |
| 231-237 | CHARLEVOIX | 9323 | — | Yes |
| 231-238 | INDIAN RIV | 9323 | — | Yes |
| 231-242 | HARBOR SPG | 9323 | — | Yes |
| 231-256 | LKLEELANAU | 9323 | — | Yes |
| 231-258 | KALKASKA | 9323 | — | — |
| 231-264 | ELK RAPIDS | 9323 | — | Yes |
| 231-266 | IRONS | 9323 | — | Yes |
| 231-267 | WILLIAMSBG | 9323 | — | Yes |
| 231-276 | INTERLOCHN | 9323 | — | Yes |
| 231-347 | PETOSKEY | 9323 | — | — |
| 231-348 | PETOSKEY | 9323 | — | — |
| 231-352 | FRANKFORT | 9323 | — | Yes |
| 231-354 | CORAL | 9323 | — | Yes |
| 231-386 | NORTHPORT | 9323 | — | Yes |
| 231-389 | HARRIETTA | 9323 | — | Yes |
| 231-398 | MANISTEE | 9323 | — | Yes |
| 231-436 | MACKINAWCY | 9323 | — | Yes |
| 231-439 | PETOSKEY | 9323 | — | — |
| 231-462 | FOUNTAIN | 9323 | — | Yes |
| 231-464 | FREESOIL | 9323 | — | Yes |
| 231-487 | PETOSKEY | 9323 | — | Yes |
| 231-525 | WOLVERINE | 9323 | — | Yes |
| 231-526 | HARBOR SPG | 9323 | — | — |
| 231-527 | BIG RAPIDS | 9323 | — | Yes |
| 231-535 | WALLOON LK | 9323 | — | Yes |
| 231-536 | EASTJORDAN | 9323 | — | Yes |
| 231-539 | PELLSTON | 9323 | — | Yes |
| 231-547 | CHARLEVOIX | 9323 | — | — |
| 231-582 | BOYNE CITY | 9323 | — | — |
| 231-587 | MANCELONA | 9323 | — | Yes |
| 231-591 | BIG RAPIDS | 9323 | — | — |
| 231-592 | BIG RAPIDS | 9323 | — | — |
| 231-597 | CHEBOYGAN | 9323 | — | Yes |
| 231-625 | CHEBOYGAN | 9323 | — | Yes |
| 231-627 | CHEBOYGAN | 9323 | — | Yes |
| 231-652 | NEWAYGO | 9323 | — | Yes |
| 231-689 | WHITECLOUD | 9323 | — | Yes |
| 231-723 | MANISTEE | 9323 | — | — |
| 231-734 | EVART | 9323 | — | Yes |
| 231-743 | MARION | 9323 | — | Yes |
| 231-745 | BALDWIN | 9323 | — | Yes |
| 231-757 | SCOTTVILLE | 9323 | — | Yes |
| 231-768 | LE ROY | 9323 | — | Yes |
| 231-775 | CADILLAC | 9323 | — | — |
| 231-779 | CADILLAC | 9323 | — | — |
| 231-796 | BIG RAPIDS | 9323 | — | — |
| 231-797 | LUTHER | 9323 | — | Yes |
| 231-824 | MANTON | 9323 | — | Yes |
| 231-825 | MCBAIN | 9323 | — | Yes |
| 231-829 | TUSTIN | 9323 | — | Yes |
| 231-832 | REED CITY | 9323 | — | — |
| 231-834 | GRANT | 9323 | — | Yes |
| 231-856 | MORLEY | 9323 | — | Yes |
| 231-876 | CADILLAC | 9323 | — | Yes |
| 231-879 | FIFE LAKE | 9323 | — | Yes |
| 231-882 | BEULAH | 9323 | — | Yes |
| 231-889 | ONEKAMA | 9323 | — | Yes |
| 231-890 | TRAVERSECY | 9323 | — | — |
| 231-922 | TRAVERSECY | 9323 | — | — |
| 231-924 | FREMONT | 9323 | — | — |
| 231-928 | FREMONT | 9323 | — | Yes |
| 231-929 | TRAVERSECY | 9323 | — | — |
| 231-932 | TRAVERSECY | 9323 | — | — |
| 231-933 | TRAVERSECY | 9323 | — | — |
| 231-935 | TRAVERSECY | 9323 | — | — |
| 231-938 | TRAVERSECY | 9323 | — | Yes |
| 231-941 | TRAVERSECY | 9323 | — | — |
| 231-943 | TRAVERSECY | 9323 | — | Yes |
| 231-946 | TRAVERSECY | 9323 | — | — |
| 231-947 | TRAVERSECY | 9323 | — | — |
| 231-995 | TRAVERSECY | 9323 | — | — |
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.