The 2020 census found 2,669 people in the township.

Located in the northeastern part of the county, it borders the following townships: Part of the village of West Alexandria is located in southern Twin Township.

[4] Statewide, other Twin Townships are located in Darke and Ross counties.

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.