| 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 |
|---|---|---|---|
| 231-631 | Traverse City | Grand Traverse | Wireless |
| 231-355 | Fremont | Newaygo | Landline |
| 231-793 | White Cloud | Newaygo | Landline |
| 231-675 | Boyne City | Charlevoix | Wireless |
| 231-332 | Muskegon | Muskegon | Landline |
| 231-790 | Free Soil | Mason | Landline |
| 231-544 | Central Lake | Antrim | Landline |
| 231-316 | Ludington | Mason | Landline |
| 231-733 | Muskegon | Muskegon | Landline |
| 231-286 | Muskegon | Muskegon | Wireless |
| 231-459 | Boyne City | Charlevoix | Landline |
| 231-883 | Traverse City | Grand Traverse | Landline |
| 231-460 | Big Rapids | Mecosta | Landline |
| 231-833 | Wolverine | Cheboygan | Wireless |
| 231-764 | Fife Lake | Kalkaska | Landline |
| 231-352 | Frankfort | Benzie | Landline |
| 231-712 | Muskegon | Muskegon | Wireless |
| 231-747 | Muskegon | Muskegon | Landline |
| 231-512 | Traverse City | Grand Traverse | Wireless |
| 231-726 | Muskegon | Muskegon | Landline |