As of the 2020 census, its population was 304 and it contained 139 housing units.

[3] According to the 2010 census, the township has a total area of 45.88 square miles (118.8 km2), all land.

[5] (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.

This Newton County, Indiana location article is a stub.