| 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 |
|---|---|---|---|
| 231-527 | Big Rapids | Mecosta | Landline |
| 231-339 | Muskegon | Muskegon | Wireless |
| 231-445 | Cheboygan | Cheboygan | Wireless |
| 231-287 | Big Rapids | Mecosta | Wireless |
| 231-373 | Petoskey | Emmet | Wireless |
| 231-583 | Ludington | Mason | Landline |
| 231-539 | Pellston | Emmet | Landline |
| 231-780 | Muskegon | Muskegon | Landline |
| 231-848 | Wellston | Manistee | Landline |
| 231-395 | Grant | Newaygo | Landline |
| 231-925 | Scottville | Mason | Landline |
| 231-829 | Tustin | Osceola | Landline |
| 231-912 | Reed City | Osceola | Wireless |
| 231-377 | Bellaire | Antrim | Landline |
| 231-672 | Muskegon | Muskegon | Landline |
| 231-937 | Howard City | Montcalm | Landline |
| 231-896 | Coral | Montcalm | Landline |
| 231-525 | Wolverine | Cheboygan | Landline |
| 231-924 | Fremont | Newaygo | Landline |
| 231-388 | Tustin | Osceola | Wireless |