Classification: County
Located in: Illinois (IL)
Total Population (2000): 30652
Total Housing Units (2000): 12525
Land Area (square meters): 1822821203
Water Area (square meters): 15424970
Land Area (square miles): 703.795231
Water Area (square miles): 5.955614
Latitude (decimal degrees): 39.207454
Longitude (decimal degrees): -89.500917
FIPS Code: 17
Place FIPS Code: 135