
Union
- County:
- Hardin County
- County Seat:
- No
- Area (mi²):
- 0.571
- State:
- Iowa
Union is a city located in Hardin County, Iowa. Union has a 2025 population of 373. Union is currently declining at a rate of -1.06% annually and its population has decreased by -5.09% since the most recent census, which recorded a population of 393 in 2020.
The average household income in Union is $72,296 with a poverty rate of 15.09%. The median age in Union is 49.9 years: 52.9 years for males, and 47.8 years for females.