| 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 |
|---|---|---|---|
| 231-758 | Petoskey | Emmet | Landline |
| 231-854 | Hesperia | Oceana | Landline |
| 231-594 | Hart | Oceana | Landline |
| 231-291 | Muskegon | Muskegon | Landline |
| 231-213 | Traverse City | Grand Traverse | Landline |
| 231-972 | Mecosta | Mecosta | Landline |
| 231-207 | Honor | Benzie | Landline |
| 231-346 | Traverse City | Grand Traverse | Landline |
| 231-642 | Traverse City | Grand Traverse | Landline |
| 231-796 | Big Rapids | Mecosta | Landline |
| 231-933 | Traverse City | Grand Traverse | Landline |
| 231-404 | Stanwood | Mecosta | Wireless |
| 231-295 | Lake City | Missaukee | Landline |
| 231-768 | Tustin | Osceola | Landline |
| 231-427 | Mackinaw City | Cheboygan | Landline |
| 231-494 | Big Rapids | Mecosta | Wireless |
| 231-358 | Central Lake | Antrim | Landline |
| 231-842 | Cadillac | Wexford | Landline |
| 231-876 | Cadillac | Wexford | Landline |
| 231-497 | Boyne City | Charlevoix | Wireless |