Jefferson Township is one of nine townships in Sullivan County, Indiana, United States. At the 2020 census, its population was 355 and it contained 218 housing units.
According to the 2010 census, the township has a total area of , of which (or 98.77%) is land and (or 1.23%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains six cemeteries: Hale, McDade, Pirtle, Posey, Smith and Woodward.