Clay -- U.S. County in Kentucky Population (2000): 24556 Housing Units (2000): 9439 Land area (2000): 471.009801 sq. miles (1219.909733 sq. km) Water area (2000): 0.069320 sq. miles (0.179538 sq. km) Total area (2000): 471.079121 sq. miles (1220.089271 sq. km) Located within: Kentucky (KY), FIPS 21 Location: 37.180607 N, 83.740232 W Headwords: Clay Clay, KY Clay County Clay County, KY