[3] Located in the far southwestern part of the county, it borders the following townships: The village of Minster is located in eastern Jackson Township, and a small portion of the village of New Bremen lies in its far northeast corner.

According to the U.S. Census Bureau, Jackson Township has an area of 20.3 square miles (52.6 km2).

[4] A tiny part of Lake Loramie is located in the township's southeast.

[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.

The majority of the township is served by the Minster (45865) post office, with the southwestern section of the township served by the Fort Loramie (45845) post office.