The 2020 census found 3,297 people in the township, 283 of whom lived in the village of Marengo.

Located in the southern part of the county, it borders the following townships: The village of Marengo is located in northwestern Bennington Township.

[4] Statewide, the only other Bennington Township is located in Licking County.

[5] 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,[6] 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.