Founded in 1840, Mason County is one of 83 counties in the state of Michigan. Historically, Mason County was formed from part of Mackinac County which was named Notipekago County until 1843. The city of Ludington is the county seat. With FIPS code of 105, Mason County has a population of 29,383 and area of 1,242 square miles (3,217 km2).
List of all cities in Mason County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Branch, MI | 49402 | 231 |
| Custer, MI | 49405 | 231 |
| Fountain, MI | 49410 | 231 |
| Free Soil, MI | 49411 | 231 |
| Ludington, MI | 49431 | 231 |
| Scottville, MI | 49454 | 231 |
| Walhalla, MI | 49458 | 231 |