Classification: County
Located in: Illinois (IL)
Total Population (2000): 33893
Total Housing Units (2000): 13328
Land Area (square meters): 1498090643
Water Area (square meters): 48799890
Land Area (square miles): 578.416056
Water Area (square miles): 18.841744
Latitude (decimal degrees): 38.079211
Longitude (decimal degrees): -89.796877
FIPS Code: 17
Place FIPS Code: 157