Union
- County:
- Clinton County
- County Seat:
- No
- Area (mi²):
- 19.804
- State:
- Indiana
Union is located in Clinton County, Indiana. Union has a 2025 population of 933 . Union is currently growing at a rate of 0.32% annually and its population has decreased by 0% since the most recent census, which recorded a population of 933 in 2020.
The median age in Union is 44.5 years: 45.2 years for males, and 40.8 years for females. For every 100 females there are 106.5 males.