Washington Township is one of thirteen townships in Grant County, Indiana, United States. As of the 2020 census, its population was 3,433 (down from 3,803 at 2010) and it contained 1,636 housing units.
The Dr. Richard Davis House was listed on the National Register of Historic Places in 1997.
According to the 2010 census, the township has a total area of , of which (or 99.56%) is land and (or 0.47%) is water. The streams of Big Lick Creek and Hummel Creek run through this township.
(This list is based on USGS data and may include former settlements.)
The township contains three cemeteries: Fairview, Hummel-Lobdell and Salem.