In 2023, Dewey County, SD had a population of 5.23k people with a median age of 27.6 and a median household income of $57,928. Between 2022 and 2023 the population of Dewey County, SD declined from 5,275 to 5,230, a −0.853% decrease and its median household income grew from $55,077 to $57,928, a 5.18% increase.
The 5 largest ethnic groups in Dewey County, SD are American Indian & Alaska Native (Non-Hispanic) (74.5%), White (Non-Hispanic) (20.2%), Two+ (Non-Hispanic) (2.72%), Two+ (Hispanic) (1.05%), and Native Hawaiian & Other Pacific Islander (Non-Hispanic) (0.593%).
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.
99.6% of the residents in Dewey County, SD are U.S. citizens.
In 2023, the median property value in Dewey County, SD was $75,400, and the homeownership rate was 61.5%.
Most people in Dewey County, SD drove alone to work, and the average commute time was 17.1 minutes. The average car ownership in Dewey County, SD was 1 car 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.