[2] According to the 2021 census gazetteer files, Waynesville Township has a total area of 24.39 square miles (63.17 km2), all land.

[3] The township contains these six cemeteries: Big Grove, Evergreen, Fairview, Halsey, Rock Creek and Union.

As of the 2020 census[2] there were 640 people, 254 households, and 166 families residing in the township.

There were 303 housing units at an average density of 12.43 per square mile (4.80/km2).

27.20% of all households were made up of individuals, and 13.40% had someone living alone who was 65 years of age or older.