Marion -- U.S. County in Kansas Population (2000): 13361 Housing Units (2000): 5882 Land area (2000): 943.107312 sq. miles (2442.636621 sq. km) Water area (2000): 10.432142 sq. miles (27.019123 sq. km) Total area (2000): 953.539454 sq. miles (2469.655744 sq. km) Located within: Kansas (KS), FIPS 20 Location: 38.338511 N, 97.086112 W Headwords: Marion Marion, KS Marion County Marion County, KS