| Name | Yankton County |
| State | South Dakota |
| FIPS Code | 46135 |
| County Seat | Yankton |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 23,509 |
| Population Growth Rate(2020-2024) | 0.84% |
| Majority Ethnicity | White 90.06% |
| Public School Majority Ethnicity | White 80% |
| Partisan Voting Index | Republican:+13 |
| Unemployment Rate (May 2026) | 2.2% |
| Sales Tax Rate (2025) | 4.2% |
| Area Code(s) | 605 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 90.06% |
| African American | 1.57% |
| Hispanic | 5.69% |
| Asian | 0.29% |
| Native American | 2.39% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 79.6% |
| African American | 1.15% |
| Hispanic | 9.55% |
| Asian | 0.63% |
| Native American | 4.06% |
| Hawaiin/Pacific Islander | 0.03% |