| City | County | 2025 Pop. ↓ |
|---|---|---|
| Union charter township | Isabella County | 11,678 |
| Utica | Macomb County | 5,056 |
| Unadilla township | Livingston County | 3,275 |
| Union township | Cass County | 2,829 |
| Union City | Branch County | 1,679 |
| Ubly | Huron County | 827 |
| Unionville | Tuscola County | 480 |