Welch is a city in and the county seat of McDowell County, West Virginia, United States. The population was 3,590 at the 2020 census. Welch …Welch is a city in and the county seat of McDowell County, West Virginia, United States. The population was 3,590 at the 2020 census. Welch was incorporated as a city in 1893. Welch was incorporated in 1893 and named after Isaiah A. Welch, a former captain in the Confederate States Army who came to the region as a surveyor, and helped establish the plan for the beginning of a new town at the confluence of Tug Fork and Elkhorn Creek.
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