Leavenworth -- U.S. County in Kansas Population (2000): 68691 Housing Units (2000): 24401 Land area (2000): 463.271913 sq. miles (1199.868696 sq. km) Water area (2000): 5.057903 sq. miles (13.099909 sq. km) Total area (2000): 468.329816 sq. miles (1212.968605 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.226737 N, 94.979816 W Headwords: Leavenworth Leavenworth, KS Leavenworth County Leavenworth County, KS