Marion -- U.S. County in Kentucky Population (2000): 18212 Housing Units (2000): 7277 Land area (2000): 346.393216 sq. miles (897.154272 sq. km) Water area (2000): 0.468122 sq. miles (1.212431 sq. km) Total area (2000): 346.861338 sq. miles (898.366703 sq. km) Located within: Kentucky (KY), FIPS 21 Location: 37.554278 N, 85.269545 W Headwords: Marion Marion, KY Marion County Marion County, KY