Classification: County
Located in: Illinois (IL)
Total Population (2000): 41786
Total Housing Units (2000): 15414
Land Area (square meters): 728473464
Water Area (square meters): 1751854
Land Area (square miles): 281.265189
Water Area (square miles): 0.676395
Latitude (decimal degrees): 42.298948
Longitude (decimal degrees): -88.834228
FIPS Code: 17
Place FIPS Code: 7