| 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 |
|---|---|---|---|
| 231-866 | Suttons Bay | Leelanau | Wireless |
| 231-751 | Boyne Falls | Charlevoix | Landline |
| 231-776 | Petoskey | Emmet | Landline |
| 231-646 | Ellsworth | Antrim | Landline |
| 231-349 | Big Rapids | Mecosta | Wireless |
| 231-676 | Bellaire | Antrim | Wireless |
| 231-312 | Frankfort | Benzie | Landline |
| 231-315 | Muskegon | Muskegon | Landline |
| 231-727 | Muskegon | Muskegon | Landline |
| 231-477 | Brethren | Manistee | Landline |
| 231-305 | Big Rapids | Mecosta | Landline |
| 231-615 | Cheboygan | Cheboygan | Wireless |
| 231-719 | Muskegon | Muskegon | Landline |
| 231-229 | Lake City | Missaukee | Landline |
| 231-582 | Boyne City | Charlevoix | Landline |
| 231-369 | South Boardman | Kalkaska | Landline |
| 231-444 | Wexford | Wexford | - |
| 231-803 | Morley | Mecosta | Landline |
| 231-436 | Mackinaw City | Cheboygan | Landline |
| 231-522 | Luther | Lake | Landline |