The 2020 census found 1,210 people in the township.

Located in the southwestern corner part of the county, it borders the following townships: No municipalities are located in Mifflin Township, although the unincorporated community of Latham lies in the eastern part of the township.

Statewide, other Mifflin Townships are located in Ashland, Franklin, Richland, and Wyandot 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,[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.