In 2019, Buffalo County, SD had a population of 2.03k people with a median age of 25.8 and a median household income of $34,808. Between 2018 and 2019 the population of Buffalo County, SD declined from 2,053 to 2,026, a −1.32% decrease and its median household income grew from $32,500 to $34,808, a 7.1% increase.
The 5 largest ethnic groups in Buffalo County, SD are American Indian & Alaska Native (Non-Hispanic) (81%), White (Non-Hispanic) (13.7%), American Indian & Alaska Native (Hispanic) (3.9%), Two+ (Non-Hispanic) (1.04%), and White (Hispanic) (0.247%). 0% of the households in Buffalo County, SD speak a non-English language at home as their primary language, and 100% of the residents in Buffalo County, SD are U.S. citizens.
In 2019, the median property value in Buffalo County, SD was $49,000, and the homeownership rate was 46.3%. Most people in Buffalo County, SD drove alone to work, and the average commute time was 12.2 minutes. The average car ownership in Buffalo County, SD was 2 cars per household.