Classification: County
Located in: Illinois (IL)
Total Population (2000): 35503
Total Housing Units (2000): 15331
Land Area (square meters): 2249570413
Water Area (square meters): 12264509
Land Area (square miles): 868.564029
Water Area (square miles): 4.735354
Latitude (decimal degrees): 41.38642
Longitude (decimal degrees): -89.477767
FIPS Code: 17
Place FIPS Code: 11