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Welch is a city located in McDowell County in the State of West Virginia, United States. The population was 3,590 at the 2020 census, however the 2021 census estimate put the population at 1,914, due to the McDowell Prison complex in the northeast splitting from the city of Welch as part of unincorporated McDowell County. Incorporated as a city in 1893, it is the county seat of McDowell County.