Tiffin, OH -- U.S. city in Ohio Population (2000): 18135 Housing Units (2000): 7862 Land area (2000): 6.494442 sq. miles (16.820526 sq. km) Water area (2000): 0.141731 sq. miles (0.367082 sq. km) Total area (2000): 6.636173 sq. miles (17.187608 sq. km) FIPS code: 76778 Located within: Ohio (OH), FIPS 39 Location: 41.116834 N, 83.179003 W ZIP Codes (1990): 44883 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Tiffin, OH Tiffin