 mount union is a city in henry county, iowa, usa. the population was 107 at the 2010 census. ==geography== mount union is located at  (41.057503, -91.390758). according to the united states census bureau, the city has a total area of , all of it land. ==demographics== {{historical populations |title = historical populations |type = usa |align = left |1910| 195 |1920| 225 |1930| 167 |1940| 186 |1950| 167 |1960| 176 |1970| 
Cities_in_Henry_County,_Iowa Cities_in_Iowa