'Clay County, MO' definitions:

Clay -- U.S. County in Missouri

From: Gazetteer 2000
Name :
Clay -- U.S. County in Missouri
Population (2000) :
184006
Housing Units (2000) :
76230
Land area (2000) :
396.348219 sq. miles (1026.537131 sq. km)
Water area (2000) :
12.515353 sq. miles (32.414613 sq. km)
Total area (2000) :
408.863572 sq. miles (1058.951744 sq. km)
Located within :
Missouri (MO), FIPS 29
Location :
39.253674 N, 94.474033 W