In 2020, Dewey County, SD had a population of 5.84k people with a median age of 27.4 and a median household income of $45,859. Between 2019 and 2020 the population of Dewey County, SD grew from 5,833 to 5,841, a 0.137% increase and its median household income declined from $47,475 to $45,859, a −3.4% decrease.
The 5 largest ethnic groups in Dewey County, SD are American Indian & Alaska Native (Non-Hispanic) (74.8%), White (Non-Hispanic) (19.4%), American Indian & Alaska Native (Hispanic) (2.26%), Two+ (Hispanic) (1.54%), and Two+ (Non-Hispanic) (0.942%).
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.
99.1% of the residents in Dewey County, SD are U.S. citizens.
In 2020, the median property value in Dewey County, SD was $65,900, and the homeownership rate was 59.8%. Most people in Dewey County, SD drove alone to work, and the average commute time was 16.2 minutes. The average car ownership in Dewey County, SD was 2 cars per household.