Charleston -- U.S. County in South Carolina Population (2000): 309969 Housing Units (2000): 141031 Land area (2000): 918.508893 sq. miles (2378.927011 sq. km) Water area (2000): 439.605243 sq. miles (1138.572304 sq. km) Total area (2000): 1358.114136 sq. miles (3517.499315 sq. km) Located within: South Carolina (SC), FIPS 45 Location: 32.809639 N, 79.991379 W Headwords: Charleston Charleston, SC Charleston County Charleston County, SC