Classification: County
Located in: Illinois (IL)
Total Population (2000): 35372
Total Housing Units (2000): 14992
Land Area (square meters): 1836459714
Water Area (square meters): 17232565
Land Area (square miles): 709.06109
Water Area (square miles): 6.653531
Latitude (decimal degrees): 39.528077
Longitude (decimal degrees): -89.262544
FIPS Code: 17
Place FIPS Code: 21