Harrison -- U.S. County in Iowa Population (2000): 15666 Housing Units (2000): 6602 Land area (2000): 696.722765 sq. miles (1804.503600 sq. km) Water area (2000): 4.203334 sq. miles (10.886585 sq. km) Total area (2000): 700.926099 sq. miles (1815.390185 sq. km) Located within: Iowa (IA), FIPS 19 Location: 41.687140 N, 95.810212 W Headwords: Harrison Harrison, IA Harrison County Harrison County, IA