| 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 |
|---|---|---|---|
| 231-464 | Free Soil | Mason | Landline |
| 231-264 | Elk Rapids | Antrim | Landline |
| 231-202 | Mecosta | Mecosta | Wireless |
| 231-742 | Hart | Oceana | Wireless |
| 231-292 | Whitehall | Muskegon | Landline |
| 231-568 | Traverse City | Grand Traverse | Landline |
| 231-563 | Muskegon | Muskegon | Landline |
| 231-845 | Ludington | Mason | Landline |
| 231-249 | Cheboygan | Cheboygan | Landline |
| 231-516 | Petoskey | Emmet | Wireless |
| 231-794 | Manistee | Manistee | Wireless |
| 231-488 | Manistee | Manistee | Landline |
| 231-350 | Bellaire | Antrim | Wireless |
| 231-546 | Boyne Falls | Charlevoix | Landline |
| 231-655 | Manistee | Manistee | Wireless |
| 231-533 | Bellaire | Antrim | Landline |
| 231-731 | Shelby | Oceana | Landline |
| 231-873 | Hart | Oceana | Landline |
| 231-519 | Newaygo | Newaygo | Wireless |
| 231-981 | Whitehall | Muskegon | Landline |