Classification: County
Located in: Illinois (IL)
Total Population (2000): 48979
Total Housing Units (2000): 21713
Land Area (square meters): 1461230391
Water Area (square meters): 1388256
Land Area (square miles): 564.184232
Water Area (square miles): 0.536009
Latitude (decimal degrees): 42.340808
Longitude (decimal degrees): -89.642608
FIPS Code: 17
Place FIPS Code: 177