| Name | Dewey County |
| State | South Dakota |
| FIPS Code | 46041 |
| County Seat | Timber Lake |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 5,179 |
| Population Growth Rate(2020-2024) | -1.24% |
| Majority Ethnicity | Native American 76.71% |
| Public School Majority Ethnicity | Native American 89% |
| Partisan Voting Index | Democratic:+7 |
| Unemployment Rate (May 2026) | 3.9% |
| Area Code(s) | 605 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 20.67% |
| African American | 0.41% |
| Hispanic | 1.55% |
| Asian | 0.06% |
| Native American | 76.71% |
| Hawaiin/Pacific Islander | 0.61% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 9.71% |
| African American | 0.17% |
| Hispanic | 0.64% |
| Asian | 0.06% |
| Native American | 89.13% |
| Hawaiin/Pacific Islander | 0.06% |