Custer County's estimated 2026 population is 9,756 with a growth rate of 2.23% in the past year according to the most recent United States census data. Custer County is the 19th largest county in South Dakota. The 2010 population was 8,275 and has seen a growth of 17.9% since that time.
Data after 2023 is projected based on recent change
The racial composition of Custer County includes 90.86% White, and smaller percentages for Native American, Black or African American, Asian, other race and multiracial populations.
White (90.86%)
Two or more races (6.25%)
Native American (1.83%)
Black or African American (0.37%)
Asian (0.36%)
Other race (0.33%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 7,892 | 90.86% |
| Two or more races | 543 | 6.25% |
| Native American | 159 | 1.83% |
| Black or African American | 32 | 0.37% |
| Asian | 31 | 0.36% |
| Other race | 29 | 0.33% |
Married
Widowed
Divorced
Separated
Never Married
Custer County's average per capita income is $50,856. Household income levels show a median of $81,958. The poverty rate stands at 6.6%.
Name | Median | Mean |
|---|---|---|
| Married Families | $97,328 | - |
| Families | $93,986 | $128,685 |
| Households | $81,958 | $109,295 |
| Non Families | $40,907 | $58,537 |
Average Income
Median Household Income
Poverty Rate