Sangamon -- U.S. County in Illinois Population (2000): 188951 Housing Units (2000): 85459 Land area (2000): 868.182194 sq. miles (2248.581464 sq. km) Water area (2000): 8.824498 sq. miles (22.855343 sq. km) Total area (2000): 877.006692 sq. miles (2271.436807 sq. km) Located within: Illinois (IL), FIPS 17 Location: 39.763854 N, 89.646499 W Headwords: Sangamon Sangamon, IL Sangamon County Sangamon County, IL