Keithsburg, IL -- U.S. city in Illinois Population (2000): 714 Housing Units (2000): 306 Land area (2000): 2.578764 sq. miles (6.678969 sq. km) Water area (2000): 0.598782 sq. miles (1.550837 sq. km) Total area (2000): 3.177546 sq. miles (8.229806 sq. km) FIPS code: 39298 Located within: Illinois (IL), FIPS 17 Location: 41.100020 N, 90.937293 W ZIP Codes (1990): 61442 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Keithsburg, IL Keithsburg