| 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 |
|---|---|---|---|
| 231-640 | Lake Ann | Benzie | Wireless |
| 231-736 | Muskegon | Muskegon | Landline |
| 231-262 | Elmira | Otsego | Landline |
| 231-276 | Interlochen | Grand Traverse | Landline |
| 231-244 | Charlevoix | Charlevoix | - |
| 231-499 | Traverse City | Grand Traverse | Wireless |
| 231-414 | Newaygo | Newaygo | Landline |
| 231-681 | Fruitport | Muskegon | Landline |
| 231-668 | Traverse City | Grand Traverse | Landline |
| 231-632 | Traverse City | Grand Traverse | Landline |
| 231-649 | Traverse City | Grand Traverse | Wireless |
| 231-259 | Shelby | Oceana | Landline |
| 231-753 | Petoskey | Emmet | Landline |
| 231-884 | Cadillac | Wexford | Landline |
| 231-267 | Williamsburg | Grand Traverse | Landline |
| 231-955 | Muskegon | Muskegon | Landline |
| 231-372 | Evart | Osceola | Landline |
| 231-875 | Fruitport | Muskegon | Landline |
| 231-520 | Charlevoix | Charlevoix | Landline |
| 231-534 | Traverse City | Grand Traverse | Landline |