Haddon Township is one of nine townships in Sullivan County, Indiana, United States. As of the 2020 census, its population was 3,762 and it contained 780 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.65%) is land and (or 0.35%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these thirty two cemeteries: Alsman, Arnett, Bethlehem, Benefiel, Booker, Boone, Boyle, Carlisle Old Town, Cartwright, Dooley, Duncan, Engle, Hackett, Haddon, Harper, Independent Order of Odd Fellows, Land, Ledgerwood, Lewis, Loudermilk, McCammon, Mccammon #1, Neil Paxton, Providence, Purcell, Skidmore, Shepard, Snyder, Trimble, Vester, Wilson, and Walters.