Washington Township is one of ten townships in Newton County, Indiana. As of the 2020 census, its population was 304 and it contained 139 housing units.
According to the 2010 census, the township has a total area of , all land.
(This list is based on USGS data and may include former settlements.)
Washington Township residents may obtain a free library card from the Brook-Iroquois Township Public Library in Brook.