Washington Township is one of fourteen townships in Dearborn County, Indiana. As of the 2010 census, its population was 1,431 and it contained 574 housing units.
Washington Township was established in 1852.
According to the 2010 census, the township has a total area of , of which (or 99.49%) is land and (or 0.51%) is water.
The township contains one cemetery, Mount Tabor Church.
Washington Township residents may obtain a library card at the Aurora Public Library in Aurora.