Dewey County's estimated 2025 population is 5,340 with a growth rate of 1.25% in the past year according to the most recent United States census data. Dewey County is the 33rd largest county in South Dakota. The 2010 population was 5,325 and has seen a growth of 0.28% since that time.
Data after 2023 is projected based on recent change
The racial composition of Dewey County includes 74.95% Native American, 20.19% White, and smaller percentages for Native Hawaiian or Pacific Islander, Black or African American, Asian, other race and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| Native American | 3,920 | 74.95% |
| White | 1,056 | 20.19% |
| Two or more races | 197 | 3.77% |
| Native Hawaiian or Pacific Islander | 31 | 0.59% |
| Black or African American | 21 | 0.4% |
| Asian | 3 | 0.06% |
| Other race | 2 | 0.04% |
Married
Widowed
Divorced
Separated
Never Married
Dewey County's average per capita income is $37,557. Household income levels show a median of $57,928. The poverty rate stands at 32.32%.
Name | Median | Mean |
|---|---|---|
| Married Families | $95,382 | - |
| Families | $62,837 | $75,998 |
| Households | $57,928 | $69,239 |
| Non Families | $34,313 | $46,350 |
Average Income
Median Household Income
Poverty Rate