Somonauk, IL -- U.S. village in Illinois Population (2000): 1295 Housing Units (2000): 512 Land area (2000): 0.612750 sq. miles (1.587016 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.612750 sq. miles (1.587016 sq. km) FIPS code: 70460 Located within: Illinois (IL), FIPS 17 Location: 41.633940 N, 88.681945 W ZIP Codes (1990): 60552 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Somonauk, IL Somonauk