'Logan County, IL' definitions:

Logan -- U.S. County in Illinois

From: Gazetteer 2000
Name :
Logan -- U.S. County in Illinois
Population (2000) :
31183
Housing Units (2000) :
11872
Land area (2000) :
618.139601 sq. miles (1600.974150 sq. km)
Water area (2000) :
0.865983 sq. miles (2.242885 sq. km)
Total area (2000) :
619.005584 sq. miles (1603.217035 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
40.143596 N, 89.365106 W