'Montgomery County, IL' definitions:
Montgomery -- U.S. County in Illinois
From: Gazetteer 2000
Name :
Montgomery -- U.S. County in Illinois
Population (2000) :
30652
Housing Units (2000) :
12525
Land area (2000) :
703.795231 sq. miles (1822.821203 sq. km)
Water area (2000) :
5.955614 sq. miles (15.424970 sq. km)
Total area (2000) :
709.750845 sq. miles (1838.246173 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
39.207454 N, 89.500917 W