COUNTY · SC
Union County, South Carolina
Union County is a county in South Carolina with FIPS code 45087 and an estimated population of 26,629 (Census 2023), 35th largest of 46 in the state.
County facts
- Name
- Union County
- State
- South Carolina
- Type
- county
- FIPS code
- 45087
- State FIPS
- 45
- Population (2023)
- 26,629
- Change since 2020
- -2.0%
- State rank
- 35 of 46
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in South Carolina
Questions
What is the FIPS code for Union County?
Union County, South Carolina has the five-digit FIPS code 45087: 45 for the state and 087 for the county.
What state is Union County in?
Union County is in South Carolina.
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.