Putnam County is a county in the U.S. state of West Virginia. As of the 2020 census, the population was 57,440. Its county seat is Winfield, its largest incorporated city is Hurricane, and its largest community is the census-designated place of Teays Valley. Putnam County is part of the Huntington–Ashland, WV-KY-OH Metropolitan Statistical Area, across the Kanawha River from Charleston, West Virginia.

Mason County is a county in the U.S. state of West Virginia. As of the 2020 census, the population was 25,453. Its county seat and largest city is Point Pleasant. The county was founded in 1804 and named for George Mason, delegate to the U.S. Constitutional Convention. Before the Civil War, the county was in the State of Virginia.