| 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 |
|---|---|---|---|
| 231-342 | Traverse City | Grand Traverse | Wireless |
| 231-425 | Ludington | Mason | Landline |
| 231-735 | Traverse City | Grand Traverse | Landline |
| 231-351 | Scottville | Mason | Landline |
| 231-797 | Luther | Lake | Landline |
| 231-336 | Ludington | Mason | Landline |
| 231-386 | Northport | Leelanau | Landline |
| 231-908 | Mc Bain | Missaukee | Landline |
| 231-378 | Copemish | Manistee | Landline |
| 231-704 | Free Soil | Mason | Landline |
| 231-907 | Ludington | Mason | Wireless |
| 231-549 | Boyne Falls | Charlevoix | Landline |
| 231-559 | Mc Bain | Missaukee | Landline |
| 231-724 | Muskegon | Muskegon | Landline |
| 231-235 | Levering | Emmet | Landline |
| 231-994 | Lake Leelanau | Leelanau | Landline |
| 231-487 | Petoskey | Emmet | Landline |
| 231-345 | Reed City | Osceola | Landline |
| 231-856 | Morley | Mecosta | Landline |
| 231-368 | Baldwin | Lake | Landline |