Union City
- County:
- Obion County
- County Seat:
- Yes
- Area (mi²):
- 12.108
- State:
- Tennessee
Union City is a city located in Obion County, Tennessee. Union City has a 2026 population of 10,876. It is also the county seat of Obion County. Union City is currently declining at a rate of -0.68% annually and its population has decreased by -2.56% since the most recent census, which recorded a population of 11,162 in 2020.