Stanley County's 2026 population is estimated at 2,965, reflecting a -0.84% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Stanley County is the 47th largest county in South Dakota. The 2010 population was 2,972 and has grown -0.24% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.5 years
Female: 48.7 years
Male: 43.2 years
There are 2,376 adults, (735 of whom are seniors) in Stanley County.
Female: 1,383 (45.9%)
Male: 1,632 (54.1%)
The racial composition of Stanley County includes 88.06% White, and smaller percentages for Native American, other race, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 2,655 | 88.06% |
| Two or more races | 247 | 8.19% |
| Native American | 78 | 2.59% |
| Other race | 32 | 1.06% |
| Black or African American | 3 | 0.1% |
Stanley County 's average per capita income is $56,840. Household income levels show a median of $87,712. The poverty rate stands at 5.07%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $125,469 | - |
| Families | $113,750 | $117,475 |
| Households | $87,712 | $96,262 |
| Non Families | $40,385 | $51,104 |
Average Income
Median Household Income
Poverty Rate