Located in the northeastern corner of the county, it borders the following townships: Two municipalities are located in Washington Township: part of the city of Fostoria in the northeast, and the village of Arcadia in the southwest.

It is one of forty-three Washington Townships statewide.

It was named for George Washington, first President of the United States.

[5] 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,[6] 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.