Marion -- U.S. County in South Carolina Population (2000): 35466 Housing Units (2000): 15143 Land area (2000): 489.062882 sq. miles (1266.666996 sq. km) Water area (2000): 5.027438 sq. miles (13.021005 sq. km) Total area (2000): 494.090320 sq. miles (1279.688001 sq. km) Located within: South Carolina (SC), FIPS 45 Location: 34.155374 N, 79.336328 W Headwords: Marion Marion, SC Marion County Marion County, SC