Union Township was organized on August 9, 1803.[5] It was named for the federal union.[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]
Government
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. Two are elected in the year after the presidential election and one is elected in the year before it. 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. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees.