COUNTY · SC
Barnwell County, South Carolina
Barnwell County is a county in South Carolina with FIPS code 45011 and an estimated population of 20,447 (Census 2023), 38th largest of 46 in the state.
County facts
- Name
- Barnwell County
- State
- South Carolina
- Type
- county
- FIPS code
- 45011
- State FIPS
- 45
- Population (2023)
- 20,447
- Change since 2020
- -0.7%
- State rank
- 38 of 46
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in South Carolina
Questions
What is the FIPS code for Barnwell County?
Barnwell County, South Carolina has the five-digit FIPS code 45011: 45 for the state and 011 for the county.
What state is Barnwell County in?
Barnwell 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.