Dennison, OH -- U.S. village in Ohio Population (2000): 2992 Housing Units (2000): 1233 Land area (2000): 1.375921 sq. miles (3.563620 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.375921 sq. miles (3.563620 sq. km) FIPS code: 21714 Located within: Ohio (OH), FIPS 39 Location: 40.394045 N, 81.330064 W ZIP Codes (1990): 44621 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dennison, OH Dennison