For other Union townships in the U.S. state of Iowa, see Union Township (disambiguation) § Iowa.'Union Township is a township in Poweshiek County, Iowa, USA.[1] References [1]U.S. Geological Survey Geographic Names Information System: Union Township, Poweshiek County, Iowa 41°33′N 92°36′W This article about the geography of Poweshiek County, Iowa is a stub. You can help Wikipedia by expanding it.vteWikiwand - on Seamless Wikipedia browsing. On steroids.