Hennepin, IL -- U.S. village in Illinois Population (2000): 707 Housing Units (2000): 334 Land area (2000): 5.222807 sq. miles (13.527008 sq. km) Water area (2000): 0.359754 sq. miles (0.931758 sq. km) Total area (2000): 5.582561 sq. miles (14.458766 sq. km) FIPS code: 34098 Located within: Illinois (IL), FIPS 17 Location: 41.256712 N, 89.329899 W ZIP Codes (1990): 61327 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Hennepin, IL Hennepin