In 2018, Dewey County, SD had a population of 5.78k people with a median age of 27.8 and a median household income of $43,954. Between 2017 and 2018 the population of Dewey County, SD grew from 5,709 to 5,779, a 1.23% increase and its median household income grew from $41,190 to $43,954, a 6.71% increase.
The 5 largest ethnic groups in Dewey County, SD are American Indian & Alaska Native (Non-Hispanic) (77.8%), White (Non-Hispanic) (20.2%), Two+ (Non-Hispanic) (0.848%), American Indian & Alaska Native (Hispanic) (0.588%), and Two+ (Hispanic) (0.277%). 0% of the households in Dewey County, SD speak a non-English language at home as their primary language, and 99.9% of the residents in Dewey County, SD are U.S. citizens.
In 2018, the median property value in Dewey County, SD was $63,600, and the homeownership rate was 57.8%. Most people in Dewey County, SD drove alone to work, and the average commute time was 15.3 minutes. The average car ownership in Dewey County, SD was 2 cars per household.