CITY · SC

What county is Charleston, SC in?

Charleston, SC is mostly in Charleston County. County FIPS code 45019, population 424,367 (2023 estimate).

County details

City: Charleston, South Carolina
Primary county: Charleston County
FIPS code: 45019
County population: 424,367

Some cities extend into more than one county. Charleston is placed in the county that contains its center. For a specific address, use the address lookup.

Questions

What county is Charleston in?

Charleston, SC is mostly in Charleston County.

What is the county seat of Charleston County?

County seats are not part of the data on this site. Check the county’s official website.

Can a city be in two counties?

Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.

Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.