'Washington County, ID' definitions:

Washington -- U.S. County in Idaho

From: Gazetteer 2000
Name :
Washington -- U.S. County in Idaho
Population (2000) :
9977
Housing Units (2000) :
4138
Land area (2000) :
1456.318512 sq. miles (3771.847470 sq. km)
Water area (2000) :
17.225268 sq. miles (44.613238 sq. km)
Total area (2000) :
1473.543780 sq. miles (3816.460708 sq. km)
Located within :
Idaho (ID), FIPS 16
Location :
44.392256 N, 116.851251 W