Founded in 1831, Isabella County is one of 83 counties in the state of Michigan. Historically, Isabella County was formed from part of Mackinac County and unorganized territory. The city of Mt. Pleasant is the county seat. With FIPS code of 73, Isabella County has a population of 64,813 and area of 578 square miles (1,497 km2).
List of all cities in Isabella County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Blanchard, MI | 49310 | 989 |
| Central Michigan University, MI | 48859 | 989 |
| Lake Isabella, MI | 48893 | 989 |
| Millbrook, MI | 49310 | 989 |
| Mount Pleasant, MI | 48804 | 989 |
| 48858 | 989 | |
| 48859 | 989 | |
| Rosebush, MI | 48878 | 989 |
| Shepherd, MI | 48883 | 989 |
| Weidman, MI | 48893 | 989 |
| Winn, MI | 48896 | 989 |