Union
- County:
- Republic County
- County Seat:
- No
- Area (mi²):
- 35.828
- State:
- Kansas
Union is located in Republic County, Kansas. Union has a 2025 population of 28 . Union is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 28 in 2020.
The median age in Union is 46.8 years: 0 years for males, and 46.7 years for females. For every 100 females there are 47.8 males.