Classification: County
Located in: Illinois (IL)
Total Population (2000): 88969
Total Housing Units (2000): 32988
Land Area (square meters): 1642457595
Water Area (square meters): 2106707
Land Area (square miles): 634.15645
Water Area (square miles): 0.813404
Latitude (decimal degrees): 41.897263
Longitude (decimal degrees): -88.739318
FIPS Code: 17
Place FIPS Code: 37