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.
Native American
White
Two or more races
Native Hawaiian or Pacific Islander
Black or African American
Asian
Other race
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