'Clay County, AR' definitions:

Clay -- U.S. County in Arkansas

From: Gazetteer 2000
Name :
Clay -- U.S. County in Arkansas
Population (2000) :
17609
Housing Units (2000) :
8498
Land area (2000) :
639.298028 sq. miles (1655.774222 sq. km)
Water area (2000) :
2.117764 sq. miles (5.484984 sq. km)
Total area (2000) :
641.415792 sq. miles (1661.259206 sq. km)
Located within :
Arkansas (AR), FIPS 05
Location :
36.364388 N, 90.400570 W