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Chapin is an unincorporated community and census-designated place in northern Franklin County, Iowa, United States. It lies along local roads just off U.S. Route 65, north of the city of Hampton, the county seat of Franklin County. Although Chapin is unincorporated, it has a postal code of 50427. The Chapin post office opened on 29 February 1860 and closed in 2005. As of the 2020 census, its population was 71.