How many people live in Dewey County, SD?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 5,300 people living in Dewey County, SD. That makes Dewey County the 33rd-most populous county in South Dakota. It is home to 0.57% of people living in the state.
5.32K
population of Dewey County, SD (2024)
0.57%
County share of the South Dakota population (2024)
About 5,300 people lived in Dewey County, SD in 2024.
Population estimates, 2000–2024
What are Dewey County, SD’s age demographics?
About 512 Dewey County residents are aged 65 and older in 2024. That represents 9.6% of its population. For comparison, the age group represents 18.9% of South Dakota’s population and 18% in the US overall.
Another 2,200 Dewey County residents, or 41% of the population, were children under 18. For comparison, the age group represents 24% of South Dakota’s population and 21.6% in the US overall.
A higher share of Dewey County, SD's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Dewey County, SD’s racial and ethnic demographics?
Non-Hispanic American Indian and Alaska Native residents make up 66.4% of the Dewey County, SD population, higher than the national share of 0.72%. Dewey County, SD also has a larger share of people identifying as non-Hispanic two or more races (5.7%) than the US overall (2.5%).
In contrast, Dewey County’s non-Hispanic white population accounts for 23.5%, below the 57.5% nationwide, and the Hispanic population makes up 3.2% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Dewey County, SD has a higher share of a non-Hispanic American Indian and Alaska Native population than South Dakota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Dewey County, SD is Eagle Butte with about 650 residents in 2024.
Cities and towns in Dewey County, SD ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Eagle Butte (pt.) | 650 |
| 2. | Timber Lake | 537 |
| 3. | Isabel | 155 |
| 4. | Balance of Dewey County | 3,980 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
