Galesburg, IL -- U.S. city in Illinois Population (2000): 33706 Housing Units (2000): 14133 Land area (2000): 16.896248 sq. miles (43.761079 sq. km) Water area (2000): 0.177578 sq. miles (0.459925 sq. km) Total area (2000): 17.073826 sq. miles (44.221004 sq. km) FIPS code: 28326 Located within: Illinois (IL), FIPS 17 Location: 40.952292 N, 90.368545 W ZIP Codes (1990): 61401 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Galesburg, IL Galesburg