Riley -- U.S. County in Kansas Population (2000): 62843 Housing Units (2000): 23397 Land area (2000): 609.550334 sq. miles (1578.728051 sq. km) Water area (2000): 12.554763 sq. miles (32.516685 sq. km) Total area (2000): 622.105097 sq. miles (1611.244736 sq. km) Located within: Kansas (KS), FIPS 20 Location: 39.254260 N, 96.672062 W Headwords: Riley Riley, KS Riley County Riley County, KS