[3] Located in the southwestern part of the county, it borders the following townships: The village of Mifflin is located in central Mifflin Township.

[4] When Ashland County was formed on 24 February 1846, Mifflin Township was partitioned, with original records remaining in the eastern ~1/3 portion of "old" Mifflin Township in the new Ashland County, and the western ~2/3 portion of "new" Mifflin Township remaining in Richland County.

[citation needed] Statewide, other Mifflin Townships are located in Franklin, Pike, 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,[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.