Plainville is a town in Hartford County, Connecticut, United States. The town is part of the Capitol Planning Region. The population was 17,525 at the 2020 census. Plainville first was inhabited by Europeans around 1650. By the 1660s, the land was incorporated as land for nearby Farmington. In the year 1869, it separated from Farmington due to the distance of th…Plainville is a town in Hartford County, Connecticut, United States. The town is part of the Capitol Planning Region. The population was 17,525 at the 2020 census. Plainville first was inhabited by Europeans around 1650. By the 1660s, the land was incorporated as land for nearby Farmington. In the year 1869, it separated from Farmington due to the distance of the town center and the growth of Plainville downtown due to the installation of the New York, New Haven and Hartford Railroad and the Hartford, Providence, and Fishkill Railroad.
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