Custer County's 2026 population is estimated at 9,756, reflecting a 2.23% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Custer County is the 19th largest county in South Dakota. The 2010 population was 8,275 and has grown 17.9% since 2010.
Data after 2023 is projected based on recent change
Overall: 57.6 years
Female: 55.9 years
Male: 58.2 years
There are 7,667 adults, (2,997 of whom are seniors) in Custer County.
Female: 4,520 (50.8%)
Male: 4,372 (49.2%)
The racial composition of Custer County includes 88.87% White, and smaller percentages for Native American, other race, Asian, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 7,902 | 88.87% |
| Two or more races | 612 | 6.88% |
| Native American | 177 | 1.99% |
| Other race | 133 | 1.5% |
| Asian | 39 | 0.44% |
| Black or African American | 29 | 0.33% |
Custer County 's average per capita income is $50,621. Household income levels show a median of $84,112. The poverty rate stands at 8.97%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $99,442 | - |
| Families | $97,876 | $123,429 |
| Households | $84,112 | $110,413 |
| Non Families | $40,652 | $77,154 |
Average Income
Median Household Income
Poverty Rate