Fairmont is a city in and county seat of Marion County, West Virginia, United States. The population was 18,313 at the 2020 census. It is the principal city of the Fairmont micropolitan area, which includes …Fairmont is a city in and county seat of Marion County, West Virginia, United States. The population was 18,313 at the 2020 census. It is the principal city of the Fairmont micropolitan area, which includes all of Marion County in North Central West Virginia, and is the second-largest city of the larger Morgantown–Fairmont combined statistical area.
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