[1] According to the 2021 census gazetteer files, Yorktown Township has a total area of 35.73 square miles (92.54 km2), all land.

The township contains these two cemeteries: Hooppole and Saint Marys.

As of the 2020 census[1] there were 447 people, 168 households, and 114 families residing in the township.

There were 185 housing units at an average density of 5.18 per square mile (2.00/km2).

16.70% of all households were made up of individuals, and 0.60% had someone living alone who was 65 years of age or older.