Marion -- U.S. County in Iowa Population (2000): 32052 Housing Units (2000): 12755 Land area (2000): 554.214104 sq. miles (1435.407880 sq. km) Water area (2000): 16.320437 sq. miles (42.269737 sq. km) Total area (2000): 570.534541 sq. miles (1477.677617 sq. km) Located within: Iowa (IA), FIPS 19 Location: 41.325547 N, 93.069235 W Headwords: Marion Marion, IA Marion County Marion County, IA