| 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 |
|---|---|---|---|
| 231-363 | Cheboygan | Cheboygan | Landline |
| 231-629 | Big Rapids | Mecosta | Landline |
| 231-335 | Fremont | Newaygo | Landline |
| 231-360 | Traverse City | Grand Traverse | Wireless |
| 231-392 | Traverse City | Grand Traverse | Landline |
| 231-303 | Newaygo | Newaygo | Landline |
| 231-995 | Traverse City | Grand Traverse | Landline |
| 231-243 | Alanson | Emmet | Landline |
| 231-557 | Muskegon | Muskegon | Wireless |
| 231-326 | Empire | Leelanau | Landline |
| 231-569 | Petoskey | Emmet | Wireless |
| 231-389 | Harrietta | Wexford | Landline |
| 231-604 | Kalkaska | Kalkaska | Landline |
| 231-323 | East Jordan | Charlevoix | Landline |
| 231-936 | Scottville | Mason | Landline |
| 231-399 | Frankfort | Benzie | Landline |
| 231-734 | Evart | Osceola | Landline |
| 231-893 | Whitehall | Muskegon | Landline |
| 231-416 | Big Rapids | Mecosta | Wireless |
| 231-678 | Brethren | Manistee | Landline |