Classification: County
Located in: Illinois (IL)
Total Population (2000): 149374
Total Housing Units (2000): 64489
Land Area (square meters): 1105280677
Water Area (square meters): 63208511
Land Area (square miles): 426.751273
Water Area (square miles): 24.404944
Latitude (decimal degrees): 41.491433
Longitude (decimal degrees): -90.507532
FIPS Code: 17
Place FIPS Code: 161