Trichome October 14, 2016 thcscience_admin For other Union townships in the U.S. state of Iowa, see Union Township (disambiguation) § Iowa. Union Township is a township in O'Brien County, Iowa, United States.[1] History[edit] Union Township was founded in 1880.[2] References[edit] ^ U.S. Geological Survey Geographic Names Information System: Union Township, O'Brien County, Iowa ^ Past and Present of O'Brien and Osceola Counties, Iowa, Volume 1. B. F. Bowen. 1914. p. 433. Municipalities and communities of O'Brien County, Iowa, United StatesCounty seat: PrimgharCities Archer Calumet Hartley Paullina Primghar Sanborn Sheldon‡ Sutherland Map of Iowa highlighting O'Brien CountyTownships Baker Caledonia Carroll Center Dale Floyd Franklin Grant Hartley Highland Liberty Lincoln Omega Summit Union Waterman Otherunincorporatedcommunities Gaza Germantown Moneta Plessis Ritter Footnotes‡This populated place also has portions in an adjacent county or counties Iowa portal United States portal 42°57′14″N 95°40′55″W / 42.954°N 95.682°W / 42.954; -95.682