Mineral County is a county in the U.S. state of West Virginia. It is part of the Cumberland metropolitan area, together with Cumberland, Maryland. As of the 2020 census, the population was 26,938. Its county seat is Keyser. The county was founded in 1866.

West Virginia is a landlocked state in the Southern and Mid-Atlantic regions of the United States. It is bordered by Pennsylvania to the north and east, Maryland to the east and northeast, Virginia to the southeast, Kentucky to the southwest, and Ohio to the northwest. West Virginia is the 10th-smallest state by area and ranks as the 12th-least populous state, with a population of 1,793,716 residents. The capital and most populous city is Charleston with a population of 49,055.