Founded in 1840, Osceola County is one of 83 counties in the state of Michigan. Historically, Osceola County was formed from part of Mackinac County which was named Unwattin County until 1843. The city of Reed City is the county seat. With FIPS code of 133, Osceola County has a population of 23,105 and area of 573 square miles (1,484 km2).
List of all cities in Osceola County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Evart, MI | 49631 | 231 |
| Hersey, MI | 49639 | 231 |
| Le Roy, MI | 49655 | 231 |
| Marion, MI | 49665 | 231 |
| Reed City, MI | 49677 | 231 |
| Sears, MI | 49679 | 231 |
| Tustin, MI | 49688 | 231 |