Statewide, other Bath Townships are located in Greene and Summit counties.
Bath Township was the first permanent settlement within the present day bounds of Allen County. The first settlers in the township were Christopher S. Wood and his family, who settled in section 7 of Bath Township in 1824. The organization of Bath Township predates that of Allen County itself, with its first township meeting held on March 2, 1829.
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, 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. The current chairperson is Roy A. Hollenbacher.