| 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 |
|---|---|---|---|
| 231-484 | East Jordan | Charlevoix | Landline |
| 231-690 | Ludington | Mason | Wireless |
| 231-486 | Traverse City | Grand Traverse | Landline |
| 231-578 | Muskegon | Muskegon | Landline |
| 231-409 | Traverse City | Grand Traverse | Landline |
| 231-587 | Mancelona | Antrim | Landline |
| 231-689 | White Cloud | Newaygo | Landline |
| 231-318 | Traverse City | Grand Traverse | Landline |
| 231-225 | Fremont | Newaygo | Landline |
| 231-448 | Naubinway | Mackinac | Landline |
| 231-204 | Fife Lake | Kalkaska | Landline |
| 231-974 | Grant | Newaygo | Landline |
| 231-255 | Onekama | Manistee | Landline |
| 231-822 | Beulah | Benzie | Landline |
| 231-741 | Wellston | Manistee | Landline |
| 231-660 | Big Rapids | Mecosta | Landline |
| 231-826 | Falmouth | Missaukee | Landline |
| 231-922 | Traverse City | Grand Traverse | Landline |
| 231-903 | Muskegon | Muskegon | Landline |
| 231-750 | Muskegon | Muskegon | Wireless |