In 2019, Bennett County, SD had a population of 3.43k people with a median age of 28.6 and a median household income of $47,500. Between 2018 and 2019 the population of Bennett County, SD declined from 3,437 to 3,425, a −0.349% decrease and its median household income declined from $48,348 to $47,500, a −1.75% decrease.
The 5 largest ethnic groups in Bennett County, SD are American Indian & Alaska Native (Non-Hispanic) (59.7%), White (Non-Hispanic) (33.2%), Two+ (Non-Hispanic) (3.85%), Two+ (Hispanic) (1.49%), and American Indian & Alaska Native (Hispanic) (0.584%). 0% of the households in Bennett County, SD speak a non-English language at home as their primary language.
99.4% of the residents in Bennett County, SD are U.S. citizens.
In 2019, the median property value in Bennett County, SD was $75,900, and the homeownership rate was 60.5%. Most people in Bennett County, SD drove alone to work, and the average commute time was 16.5 minutes. The average car ownership in Bennett County, SD was 2 cars per household.