Addison is a village in DuPage County, Illinois, United States. The population was 35,702 at the 2020 Census. It is part of the Chicago metropolitan area. The village was incorporated in 1884, at which time it had a population of 400. The community itself was originally named Dunkley's Grove after the settler Hezekiah Dunklee, and was renameā¦Addison is a village in DuPage County, Illinois, United States. The population was 35,702 at the 2020 Census. It is part of the Chicago metropolitan area. The village was incorporated in 1884, at which time it had a population of 400. The community itself was originally named Dunkley's Grove after the settler Hezekiah Dunklee, and was renamed after a town in England or Addison, New York. In 1832, Winfield Scott built Army Trail Road on top of a Potawatomi trail in Addison, in order to allow 50 broad-tired wagons to fight Black Hawk and his warriors. In 1864, the Lutheran ChurchāMissouri Synod moved its teacher training to the village from Fort Wayne, Indiana, and established the Addison Teachers Seminary; it remained in Addison until 1913, when it was relocated to River Forest, Illinois, as Concordia Teachers College. The town was also home to the Kinderheim home for children, which made up more than half its population prior to suburbanization.