Vermilion -- U.S. County in Illinois Population (2000): 83919 Housing Units (2000): 36349 Land area (2000): 899.080050 sq. miles (2328.606541 sq. km) Water area (2000): 3.056357 sq. miles (7.915927 sq. km) Total area (2000): 902.136407 sq. miles (2336.522468 sq. km) Located within: Illinois (IL), FIPS 17 Location: 40.156797 N, 87.692434 W Headwords: Vermilion Vermilion, IL Vermilion County Vermilion County, IL