Classification: County
Located in: Illinois (IL)
Total Population (2000): 51032
Total Housing Units (2000): 20420
Land Area (square meters): 1965368722
Water Area (square meters): 11485500
Land Area (square miles): 758.833138
Water Area (square miles): 4.434577
Latitude (decimal degrees): 42.025711
Longitude (decimal degrees): -89.308985
FIPS Code: 17
Place FIPS Code: 141