| General Information about Area Code 231 | |
|---|---|
| Country | United States |
| State / Province / Territory | Michigan |
| Major City | Muskegon |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 231-508 | Onekama | Manistee | Landline |
| 231-382 | Cadillac | Wexford | Wireless |
| 231-422 | Emmet | Emmet | - |
| 231-608 | Frankfort | Benzie | Landline |
| 231-899 | Leland | Leelanau | Landline |
| 231-268 | Cheboygan | Cheboygan | Wireless |
| 231-729 | Irons | Lake | Wireless |
| 231-830 | Muskegon | Muskegon | Landline |
| 231-266 | Irons | Lake | Landline |
| 231-656 | Kalkaska | Kalkaska | Landline |
| 231-823 | Stanwood | Mecosta | Landline |
| 231-435 | Cadillac | Wexford | Landline |
| 231-625 | Cheboygan | Cheboygan | Landline |
| 231-498 | Elk Rapids | Antrim | Landline |
| 231-592 | Big Rapids | Mecosta | Landline |
| 231-365 | Wolverine | Cheboygan | Landline |
| 231-543 | Tustin | Osceola | Landline |
| 231-437 | Charlevoix | Charlevoix | Landline |
| 231-863 | Scottville | Mason | Landline |
| 231-593 | Cadillac | Wexford | Landline |