Clay County
Clay County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 14,967, and was estimated to be 15,245 in 2024. The county seat is Vermillion, 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. Clay County comprises the Vermillion, SD Micropolitan Statistical Area, which is also included in the Sioux City-Vermillion, Iowa-SD-Nebraska Combined Statistical Area.
Governance bodies
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Cities and towns 2
Townships 12
- Township of Bethel pop. 189
- Township of Fairview pop. 634
- Township of Garfield pop. 198
- Township of Glenwood pop. 221
- Township of Meckling pop. 215
- Township of Norway pop. 160
- Township of Pleasant Valley pop. 157
- Township of Prairie Center pop. 188
- Township of Riverside pop. 124
- Township of Spirit Mound pop. 211
- Township of Star pop. 124
- Township of Vermillion pop. 392
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 134541
- FIPS state
- 46
- FIPS county
- 027
- FIPS place
- 99027
- Census record name
- COUNTY OF CLAY
- Mailing address
- 211 W MAIN ST, VERMILLION 57069