Calhoun -- U.S. County in Iowa Population (2000): 11115 Housing Units (2000): 5219 Land area (2000): 570.149896 sq. miles (1476.681388 sq. km) Water area (2000): 2.139603 sq. miles (5.541547 sq. km) Total area (2000): 572.289499 sq. miles (1482.222935 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.387432 N, 94.632554 W Headwords: Calhoun Calhoun, IA Calhoun County Calhoun County, IA