Decatur -- U.S. County in Kansas Population (2000): 3472 Housing Units (2000): 1821 Land area (2000): 893.545255 sq. miles (2314.271489 sq. km) Water area (2000): 0.633800 sq. miles (1.641535 sq. km) Total area (2000): 894.179055 sq. miles (2315.913024 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.777488 N, 100.431977 W Headwords: Decatur Decatur, KS Decatur County Decatur County, KS