Clay County
County in South Dakota
Clay County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 14,967. The county seat is Vermillion, which is also home to the University of South Dakota. Wikipedia
Population: 15,280 (2022)
Cities: Wakonda, Vermillion, Meckling, and more
Area: 417 mi²
Largest city: Vermillion
Named for: Henry Clay