Located in the western part of the county, it borders the following townships: No municipalities are located in Union Township.

It is one of twenty-seven Union Townships statewide.

[6] In 1833, Union Township contained one forge and finery for making iron, three gristmills and four saw mills, one store, and one tannery.

[7] 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,[8] 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.