As of the 2020 census, its population was 938 (down from 988 at 2010[3]) and it contained 403 housing units.

[4] Jackson Township was organized in 1834.

[6] According to the 2010 census, the township has a total area of 40.29 square miles (104.4 km2), of which 40.27 square miles (104.3 km2) (or 99.95%) is land and 0.02 square miles (0.052 km2) (or 0.05%) is water.

[3] (This list is based on USGS data and may include former settlements.)

The township contains six cemeteries: Lower Union, Mount Olivet, Mount Pisgah, Shirk, Wesley and Wynn.