Jackson -- U.S. County in Kansas Population (2000): 12657 Housing Units (2000): 5094 Land area (2000): 655.593759 sq. miles (1697.979968 sq. km) Water area (2000): 2.267138 sq. miles (5.871859 sq. km) Total area (2000): 657.860897 sq. miles (1703.851827 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.427956 N, 95.784241 W Headwords: Jackson Jackson, KS Jackson County Jackson County, KS