Marshall -- U.S. County in Iowa Population (2000): 39311 Housing Units (2000): 16324 Land area (2000): 572.316467 sq. miles (1482.292782 sq. km) Water area (2000): 0.698604 sq. miles (1.809376 sq. km) Total area (2000): 573.015071 sq. miles (1484.102158 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.036694 N, 92.972749 W Headwords: Marshall Marshall, IA Marshall County Marshall County, IA