Leaf River, IL -- U.S. village in Illinois Population (2000): 555 Housing Units (2000): 235 Land area (2000): 0.857001 sq. miles (2.219622 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.857001 sq. miles (2.219622 sq. km) FIPS code: 42457 Located within: Illinois (IL), FIPS 17 Location: 42.126350 N, 89.402976 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Leaf River, IL Leaf River