Wabash -- U.S. County in Illinois Population (2000): 12937 Housing Units (2000): 5758 Land area (2000): 223.470775 sq. miles (578.786625 sq. km) Water area (2000): 4.291729 sq. miles (11.115526 sq. km) Total area (2000): 227.762504 sq. miles (589.902151 sq. km) Located within: Illinois (IL), FIPS 17 Location: 38.430342 N, 87.816801 W Headwords: Wabash Wabash, IL Wabash County Wabash County, IL