Legality of Cannabis by U.S. Jurisdiction For other Union townships in the U.S. state of Iowa, see Union Township (disambiguation) § Iowa. Township in Iowa, USA Union Township is a township in Harrison County, Iowa, United States.[1] References[edit] ^ U.S. Geological Survey Geographic Names Information System: Union Township, Harrison County, Iowa Municipalities and communities of Harrison County, Iowa, United StatesCounty seat: LoganCities Dunlap‡ Little Sioux Logan Magnolia Missouri Valley Modale Mondamin Persia Pisgah Woodbine Map of Iowa highlighting Harrison CountyTownships Allen Boyer Calhoun Cass Cincinnati Clay Douglas Harrison Jackson Jefferson La Grange Lincoln Little Sioux Magnolia Morgan Raglan St. Johns Taylor Union Washington CDPs California Junction River Sioux Otherunincorporatedcommunities Hard Scratch Orson Yorkshire Beebeetown Footnotes‡This populated place also has portions in an adjacent county or counties Iowa portal United States portal 41°33′N 95°40′W / 41.550°N 95.667°W / 41.550; -95.667