Gallatin -- U.S. County in Illinois Population (2000): 6445 Housing Units (2000): 3071 Land area (2000): 323.727645 sq. miles (838.450715 sq. km) Water area (2000): 4.679813 sq. miles (12.120660 sq. km) Total area (2000): 328.407458 sq. miles (850.571375 sq. km) Located within: Illinois (IL), FIPS 17 Location: 37.782056 N, 88.233803 W Headwords: Gallatin Gallatin, IL Gallatin County Gallatin County, IL