The 2020 census found 2,886 people in the township.

Located in the west central part of the county, it borders the following townships: Much of eastern Clinton Township is occupied by the city of Mount Vernon, the county seat of Knox County.

The census-designated place of South Mount Vernon is in the center of the township, adjacent to Mount Vernon.

[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.