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.

Winfield is a city in and the county seat of Putnam County, West Virginia, United States, located along the Kanawha River. The population was 2,397 at the 2020 census. It is part of the Huntington–Ashland metropolitan area.