Washington -- U.S. County in Kansas Population (2000): 6483 Housing Units (2000): 3142 Land area (2000): 898.458246 sq. miles (2326.996076 sq. km) Water area (2000): 0.379035 sq. miles (0.981695 sq. km) Total area (2000): 898.837281 sq. miles (2327.977771 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.777103 N, 97.077243 W Headwords: Washington Washington, KS Washington County Washington County, KS