Classification: County
Located in: Illinois (IL)
Total Population (2000): 114706
Total Housing Units (2000): 50241
Land Area (square meters): 1503546813
Water Area (square meters): 12575217
Land Area (square miles): 580.522695
Water Area (square miles): 4.855319
Latitude (decimal degrees): 39.853136
Longitude (decimal degrees): -88.953227
FIPS Code: 17
Place FIPS Code: 115