Hanover Township, one of thirteen in the county, is located in west-central Butler County, Ohio. It had a population of 7,878 in 2000, up from 7,653 in 1990. The township consists of one full survey township in the Congress Lands , and had an area of thirty-six square miles before the City of Hamilton annexed the southeast corner of the township.

The twelfth in order of creation, Hanover Township was erected from Ross and St. Clair Townships by the Butler County Commissioners (James Blackburn, John Wingate, and William Robison) on December 2, 1811 with these boundaries:

Beginning at the southeast corner of the surveyed township No. 4 in the second range east of the meridian line drawn from the mouth of the Great Miami river; thence north to the northeast corner of the same township; thence west to the northwest corner thereof; thence south to the southwest corner thereof; thence east to the place of beginning.

It is bordered on the south by Ross Township, on the southwest by Morgan Township, on the west by Reily Township, on the northwest by Oxford Township, on the north by Milford Township, on the northeast by Wayne Township, and on the east by St. Clair Township.

The first election of township officers was held at Aaron Sacket's home on December 21, 1811.

The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1. Two are elected in the year after the presidential election and one is elected in the year before it. There is also an elected township clerk, who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election. Vacancies in the clerkship or on the board of trustees are filled by the remaining trustees.

Historic population figures

• 1900--1,152
• 1910--1,078
• 1920--1,061
• 1930--2,008
• 1940--2,331
• 1950--3,266
• 1960--4,958
• 1970--6,175
• 1980--7,290
• 1990--7,653

References

• Bert S. Barlow, W.H. Todhunter, Stephen D. Cone, Joseph J. Pater, and Frederick Schneider, eds. Centennial History of Butler County, Ohio. Hamilton, Ohio: B.F. Bowen, 1905.
• Jim Blount. The 1900's: 100 Years In the History of Butler County, Ohio. Hamilton, Ohio: Past Present Press, 2000.
• Butler County Engineer's Office. Butler County Official Transportation Map, 2003. Fairfield Township, Butler County, Ohio: The Office, 2003.
• A History and Biographical Cyclopaedia of Butler County, Ohio with Illustrations and Sketches of Its Representative Men and Pioneers. Cincinnati, Ohio: Western Biographical Publishing Company, 1882. [1]
• Ohio. Secretary of State. The Ohio municipal and township roster, 2002-2003. Columbus, Ohio: The Secretary, 2003.