| 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 |
|---|---|---|---|
| 231-613 | Scottville | Mason | Wireless |
| 231-645 | Traverse City | Grand Traverse | Landline |
| 231-366 | Fruitport | Muskegon | Landline |
| 231-627 | Cheboygan | Cheboygan | Landline |
| 231-328 | Merritt | Missaukee | Landline |
| 231-890 | Traverse City | Grand Traverse | Landline |
| 231-245 | Newaygo | Newaygo | Wireless |
| 231-357 | Traverse City | Grand Traverse | Wireless |
| 231-843 | Ludington | Mason | Landline |
| 231-693 | Indian River | Cheboygan | Landline |
| 231-788 | Muskegon | Muskegon | Landline |
| 231-319 | Mackinaw City | Cheboygan | Landline |
| 231-330 | Petoskey | Emmet | Wireless |
| 231-282 | Grant | Newaygo | Landline |
| 231-670 | Muskegon | Muskegon | Wireless |
| 231-773 | Muskegon | Muskegon | Landline |
| 231-999 | - | - | - |
| 231-648 | Howard City | Montcalm | Landline |
| 231-769 | Muskegon | Muskegon | Landline |
| 231-457 | Muskegon | Muskegon | Landline |