| Name | Clay County |
| State | South Dakota |
| FIPS Code | 46027 |
| County Seat | Vermillion |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 13,966 |
| Population Growth Rate(2000-2022) | 7.96% |
| Majority Ethnicity | White 91.38% |
| Public School Majority Ethnicity | White 76% |
| Partisan Voting Index | Democratic:+6 |
| Unemployment Rate (December 2024) | 1.5% |
| Area Code(s) | 605 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 91.38% |
| African American | 1.82% |
| Hispanic | 3.49% |
| Asian | 3.18% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 0.06% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 75.91% |
| African American | 2.25% |
| Hispanic | 5.13% |
| Asian | 1.13% |
| Native American | 8.82% |
| Hawaiin/Pacific Islander | 0.06% |