Classification: County
Located in: Illinois (IL)
Total Population (2000): 37535
Total Housing Units (2000): 15040
Land Area (square meters): 1087542889
Water Area (square meters): 27240335
Land Area (square miles): 419.902675
Water Area (square miles): 10.517553
Latitude (decimal degrees): 41.309747
Longitude (decimal degrees): -88.366716
FIPS Code: 17
Place FIPS Code: 63