Delavan, IL -- U.S. city in Illinois Population (2000): 1825 Housing Units (2000): 744 Land area (2000): 0.710845 sq. miles (1.841079 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.710845 sq. miles (1.841079 sq. km) FIPS code: 19226 Located within: Illinois (IL), FIPS 17 Location: 40.370835 N, 89.545651 W ZIP Codes (1990): 61734 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Delavan, IL Delavan