Atchison -- U.S. County in Kansas Population (2000): 16774 Housing Units (2000): 6818 Land area (2000): 432.337748 sq. miles (1119.749578 sq. km) Water area (2000): 2.704412 sq. miles (7.004395 sq. km) Total area (2000): 435.042160 sq. miles (1126.753973 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.543110 N, 95.252695 W Headwords: Atchison Atchison, KS Atchison County Atchison County, KS