Hardin -- U.S. County in Iowa Population (2000): 18812 Housing Units (2000): 8318 Land area (2000): 569.257419 sq. miles (1474.369884 sq. km) Water area (2000): 0.675129 sq. miles (1.748575 sq. km) Total area (2000): 569.932548 sq. miles (1476.118459 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.402071 N, 93.211684 W Headwords: Hardin Hardin, IA Hardin County Hardin County, IA