Henry -- U.S. County in Iowa Population (2000): 20336 Housing Units (2000): 8246 Land area (2000): 434.437309 sq. miles (1125.187417 sq. km) Water area (2000): 2.238354 sq. miles (5.797310 sq. km) Total area (2000): 436.675663 sq. miles (1130.984727 sq. km) Located within: Iowa (IA), FIPS 19 Location: 40.982369 N, 91.542799 W Headwords: Henry Henry, IA Henry County Henry County, IA