Humboldt, IL -- U.S. village in Illinois Population (2000): 481 Housing Units (2000): 199 Land area (2000): 0.561808 sq. miles (1.455075 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.561808 sq. miles (1.455075 sq. km) FIPS code: 36542 Located within: Illinois (IL), FIPS 17 Location: 39.604140 N, 88.319676 W ZIP Codes (1990): 61931 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Humboldt, IL Humboldt