'Union County, IL' definitions:
Union -- U.S. County in Illinois
From: Gazetteer 2000
Name :
Union -- U.S. County in Illinois
Population (2000) :
18293
Housing Units (2000) :
7894
Land area (2000) :
416.160883 sq. miles (1077.851694 sq. km)
Water area (2000) :
5.966986 sq. miles (15.454421 sq. km)
Total area (2000) :
422.127869 sq. miles (1093.306115 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
37.461737 N, 89.248116 W