Yankton County's 2026 population is estimated at 23,509, reflecting a 0% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Yankton County is the 9th largest county in South Dakota. The 2010 population was 22,436 and has grown 4.78% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.5 years
Female: 44.9 years
Male: 41.2 years
There are 18,440 adults, (5,005 of whom are seniors) in Yankton County.
Female: 11,239 (48%)
Male: 12,175 (52%)
The racial composition of Yankton County includes 87.83% White, and smaller percentages for Native American, Black or African American, other race, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 20,564 | 87.83% |
| Two or more races | 1,464 | 6.25% |
| Native American | 643 | 2.75% |
| Black or African American | 385 | 1.64% |
| Other race | 283 | 1.21% |
| Asian | 75 | 0.32% |
Yankton County 's average per capita income is $48,249. Household income levels show a median of $72,821. The poverty rate stands at 11.91%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $108,716 | - |
| Families | $97,374 | $115,423 |
| Households | $72,821 | $95,237 |
| Non Families | $45,152 | $64,527 |
Average Income
Median Household Income
Poverty Rate