Jackson -- U.S. County in Iowa Population (2000): 20296 Housing Units (2000): 8949 Land area (2000): 636.089437 sq. miles (1647.464010 sq. km) Water area (2000): 13.659810 sq. miles (35.378745 sq. km) Total area (2000): 649.749247 sq. miles (1682.842755 sq. km) Located within: Iowa (IA), FIPS 19 Location: 42.153859 N, 90.556325 W Headwords: Jackson Jackson, IA Jackson County Jackson County, IA