8 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Union charter | Isabella County | 12,141 |
| Utica | Macomb County | 5,094 |
| Unadilla | Livingston County | 3,237 |
| Union | Cass County | 3,057 |
| Union City | Branch County | 1,736 |
| Ubly | Huron County | 822 |
| Union | Cass County | 481 |
| Unionville | Tuscola County | 480 |