In 2021, Dewey County, SD had a population of 5.34k people with a median age of 28.1 and a median household income of $46,087. Between 2020 and 2021 the population of Dewey County, SD declined from 5,841 to 5,343, a −8.53% decrease and its median household income grew from $45,859 to $46,087, a 0.497% increase.
The 5 largest ethnic groups in Dewey County, SD are American Indian & Alaska Native (Non-Hispanic) (75.4%), White (Non-Hispanic) (18.3%), Two+ (Hispanic) (1.78%), American Indian & Alaska Native (Hispanic) (1.7%), and Two+ (Non-Hispanic) (1.4%).
None of the households in Dewey County, SD reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
99% of the residents in Dewey County, SD are U.S. citizens.
In 2021, the median property value in Dewey County, SD was $65,000, and the homeownership rate was 58.3%.
Most people in Dewey County, SD drove alone to work, and the average commute time was 16.3 minutes. The average car ownership in Dewey County, SD was 2 cars per household.
Dewey County, SD borders Corson County, SD, Haakon County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, and Ziebach County, SD.