Washington Township is one of seventeen townships in Adair County, Iowa, USA. At the 2010 census, its population was 145. History Washington Township was organized in 1854. Geography Washington Township covers an area of and contains no incorporated settlements. According to the USGS, it contains six cemeteries: Avondale, Campbell, Garner, Mormon, Winn and Witt. References External links US-Counties.com City-Data.com Townships in Adair County, Iowa Townships in Iowa 1854 establishments in Iowa