Jackson Township is one of nine townships in Decatur County, Indiana. As of the 2020 census, its population was 938 (down from 988 at 2010) and it contained 403 housing units.
Jackson Township was organized in 1834.
According to the 2010 census, the township has a total area of , of which (or 99.95%) is land and (or 0.05%) is water.
(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.