[3] Located in the central part of the county, it borders the following township and cities: Most of the original Harrison Township area has been incorporated into the city of Dayton, the county seat of Montgomery County.

Three census-designated places occupy most of the unincorporated parts of the township: It is one of nineteen Harrison Townships statewide.

[4] 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.

There is also an elected township fiscal officer,[5] 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.

Police services are provided in the township through a contract with the Montgomery County Sheriff’s Office.