COUNTY · TN
Union County, Tennessee
Union County is a county in Tennessee with FIPS code 47173 and an estimated population of 20,741 (Census 2023), 66th largest of 95 in the state.
County facts
- Name
- Union County
- State
- Tennessee
- Type
- county
- FIPS code
- 47173
- State FIPS
- 47
- Population (2023)
- 20,741
- Change since 2020
- +4.5%
- State rank
- 66 of 95
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Union County?
Union County, Tennessee has the five-digit FIPS code 47173: 47 for the state and 173 for the county.
What state is Union County in?
Union County is in Tennessee.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.