Most of what was once Mifflin Township has since been annexed by the cities of Gahanna in the east and Columbus, the county seat of Franklin County, in the north, west, and south.

The several small "islands" that remain are all surrounded by Columbus, except for the largest and most southerly, which borders Gahanna to the east.

Statewide, other Mifflin Townships are located in Ashland, Pike, Richland, and Wyandot counties.

[6] 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,[7] 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.