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Mapleton is a small village in Peoria County, Illinois, United States. As of the 2020 census, Mapleton had a population of 261. Mapleton is part of the Peoria, Illinois Metropolitan Statistical Area. There are four different plants in Mapleton, all located along U.S. Route 24: an Evonik chemical plant, an Arxada, LLC plant, a Caterpillar Inc. foundry, and an Ingredion facility.