As of the 2020 census, 1,523 people lived in the township.

Located in the northeastern corner of the county, it borders the following townships: No municipalities are located in Townsend Township, although the census-designated places of Vickery and Whites Landing are located in the township's west and north.

Statewide, the only other Townsend Township is located in Huron County.

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,[4] 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.