In 2020, Buffalo County, SD had a population of 2.01k people with a median age of 26.1 and a median household income of $35,000. Between 2019 and 2020 the population of Buffalo County, SD declined from 2,026 to 2,005, a −1.04% decrease and its median household income grew from $34,808 to $35,000, a 0.552% increase.
The 5 largest ethnic groups in Buffalo County, SD are American Indian & Alaska Native (Non-Hispanic) (77.5%), White (Non-Hispanic) (13.4%), American Indian & Alaska Native (Hispanic) (6.03%), Two+ (Hispanic) (1.15%), and Two+ (Non-Hispanic) (0.698%).
None of the households in Buffalo 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.
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 51.3%. Most people in Buffalo County, SD drove alone to work, and the average commute time was 14.5 minutes. The average car ownership in Buffalo County, SD was 2 cars per household.