'Washington County, IL' definitions:
Washington -- U.S. County in Illinois
From: Gazetteer 2000
Name :
Washington -- U.S. County in Illinois
Population (2000) :
15148
Housing Units (2000) :
6385
Land area (2000) :
562.607709 sq. miles (1457.147214 sq. km)
Water area (2000) :
1.510786 sq. miles (3.912917 sq. km)
Total area (2000) :
564.118495 sq. miles (1461.060131 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
38.366222 N, 89.376927 W