Hamilton -- U.S. County in Iowa Population (2000): 16438 Housing Units (2000): 7082 Land area (2000): 576.679985 sq. miles (1493.594242 sq. km) Water area (2000): 0.764511 sq. miles (1.980074 sq. km) Total area (2000): 577.444496 sq. miles (1495.574316 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.393883 N, 93.722419 W Headwords: Hamilton Hamilton, IA Hamilton County Hamilton County, IA