'Washington County, IA' definitions:

Washington -- U.S. County in Iowa

From: Gazetteer 2000
Name :
Washington -- U.S. County in Iowa
Population (2000) :
20670
Housing Units (2000) :
8543
Land area (2000) :
568.712966 sq. miles (1472.959757 sq. km)
Water area (2000) :
2.055986 sq. miles (5.324980 sq. km)
Total area (2000) :
570.768952 sq. miles (1478.284737 sq. km)
Located within :
Iowa (IA), FIPS 19
Location :
41.329998 N, 91.706689 W