[3] Located in the center of the county, it borders the following townships: Most of the village of West Union, the county seat of Adams County, is located in southwestern Tiffin Township.

It is named for Edward Tiffin, first Governor of Ohio.

[4] Statewide, the only other Tiffin Township is located in Defiance County.

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.