Peru, IL -- U.S. city in Illinois Population (2000): 9835 Housing Units (2000): 4413 Land area (2000): 5.940897 sq. miles (15.386853 sq. km) Water area (2000): 0.108039 sq. miles (0.279821 sq. km) Total area (2000): 6.048936 sq. miles (15.666674 sq. km) FIPS code: 59234 Located within: Illinois (IL), FIPS 17 Location: 41.334458 N, 89.127385 W ZIP Codes (1990): 61354 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Peru, IL Peru