Washington Township is a township in Linn County, Iowa.[1] History Washington Township was organized in 1841.[2] References [1]U.S. Geological Survey Geographic Names Information System: Washington Township, Linn County, Iowa [2]The History of Linn County, Iowa: Containing a History of the County, Its Cities, Towns, &c. Western Historical Company. 1878. pp. 361. 42.1736°N 91.7675°W / 42.1736; -91.7675 This article about the geography of Linn County, Iowa is a stub. You can help Wikipedia by expanding it.vteWikiwand - on Seamless Wikipedia browsing. On steroids.