Classification: County
Located in: Illinois (IL)
Total Population (2000): 260077
Total Housing Units (2000): 92908
Land Area (square meters): 1563078834
Water Area (square meters): 19746035
Land Area (square miles): 603.508137
Water Area (square miles): 7.623987
Latitude (decimal degrees): 42.296401
Longitude (decimal degrees): -88.353772
FIPS Code: 17
Place FIPS Code: 111