The 2020 census found 1,606 people in the township.

Located in the eastern part of the county, it borders the following townships: The village of Casstown is located in southwestern Lostcreek Township.

Lostcreek Township was established in 1818, and named after Lost Creek, a tributary of the Great Miami River.

[3] 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,[4] 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.