The 2020 census found 3,731 people in the township.

Located in the western part of the county, it borders the following townships: No municipalities are located in Southington Township, although the unincorporated community of Southington lies at the center of the township.

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.

The elementary, middle, and high schools are all on the same campus.