Clay County | |
|---|---|
 Clay County Courthouse | |
 Location within the U.S. state of South Dakota | |
 South Dakota's location within the U.S. | |
| Coordinates: 42°55′N 96°58′W / 42.92°N 96.97°W | |
| Country |  United States |
| State |  South Dakota |
| Founded | 1862 |
| Named for | Henry Clay |
| Seat | Vermillion |
| Largest city | Vermillion |
| Area | |
| • Total | 417 sq mi (1,080 km2) |
| • Land | 412 sq mi (1,070 km2) |
| • Water | 5.1 sq mi (13 km2) 1.2% |
| Population (2020) | |
| • Total | 14,967 |
| • Estimate (2023) | 15,431  |
| • Density | 36/sq mi (14/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | At-large |
| Website | www |
Clay County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 14,967.[1] The county seat is Vermillion,[2] which is also home to the University of South Dakota. The county is named for Henry Clay, American statesman, US Senator from Kentucky, and United States Secretary of State in the 19th century.[3] Clay County comprises the Vermillion, SD Micropolitan Statistical Area, which is also included in the Sioux City-Vermillion, Iowa-SD-Nebraska Combined Statistical Area.
- ^ "State & County QuickFacts". United States Census Bureau. Retrieved March 21, 2024.
- ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
- ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 83.