Carroll -- U.S. County in Illinois Population (2000): 16674 Housing Units (2000): 7945 Land area (2000): 444.212086 sq. miles (1150.503971 sq. km) Water area (2000): 21.556197 sq. miles (55.830292 sq. km) Total area (2000): 465.768283 sq. miles (1206.334263 sq. km) Located within: Illinois (IL), FIPS 17 Location: 42.076584 N, 89.953145 W Headwords: Carroll Carroll, IL Carroll County Carroll County, IL