'Clark County, WA' definitions:

Clark -- U.S. County in Washington

From: Gazetteer 2000
Name :
Clark -- U.S. County in Washington
Population (2000) :
345238
Housing Units (2000) :
134030
Land area (2000) :
628.221812 sq. miles (1627.086954 sq. km)
Water area (2000) :
27.993396 sq. miles (72.502560 sq. km)
Total area (2000) :
656.215208 sq. miles (1699.589514 sq. km)
Located within :
Washington (WA), FIPS 53
Location :
45.692187 N, 122.547831 W