| 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 |
|---|---|---|---|
| 231-620 | Traverse City | Grand Traverse | Landline |
| 231-791 | Reed City | Osceola | Landline |
| 231-698 | Harrietta | Wexford | Landline |
| 231-695 | Howard City | Montcalm | Landline |
| 231-832 | Reed City | Osceola | Landline |
| 231-205 | Brutus | Emmet | Landline |
| 231-236 | Lake City | Missaukee | Landline |
| 231-317 | Boyne City | Charlevoix | Landline |
| 231-322 | Alden | Antrim | Landline |
| 231-962 | Kaleva | Manistee | Landline |
| 231-744 | Muskegon | Muskegon | Landline |
| 231-947 | Traverse City | Grand Traverse | Landline |
| 231-739 | Muskegon | Muskegon | Landline |
| 231-598 | Big Rapids | Mecosta | Landline |
| 231-334 | Glen Arbor | Leelanau | Landline |
| 231-778 | Traverse City | Grand Traverse | Landline |
| 231-347 | Petoskey | Emmet | Landline |
| 231-881 | Petoskey | Emmet | Landline |
| 231-548 | Alanson | Emmet | Landline |
| 231-779 | Cadillac | Wexford | Landline |