Grant Township is a township in Linn County, Iowa.[1] History Grant Township was organized in 1872.[2] References [1]U.S. Geological Survey Geographic Names Information System: Grant 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. 42.2514°N 91.7581°W / 42.2514; -91.7581 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.