Marshall -- U.S. County in South Dakota Population (2000): 4576 Housing Units (2000): 2562 Land area (2000): 837.708919 sq. miles (2169.656047 sq. km) Water area (2000): 47.924964 sq. miles (124.125081 sq. km) Total area (2000): 885.633883 sq. miles (2293.781128 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 45.739558 N, 97.580659 W Headwords: Marshall Marshall, SD Marshall County Marshall County, SD