In 2019, Mellette County, SD had a population of 2.05k people with a median age of 32.9 and a median household income of $30,650. Between 2018 and 2019 the population of Mellette County, SD declined from 2,055 to 2,052, a −0.146% decrease and its median household income declined from $31,222 to $30,650, a −1.83% decrease.
The 5 largest ethnic groups in Mellette County, SD are American Indian & Alaska Native (Non-Hispanic) (54.8%), White (Non-Hispanic) (38.5%), American Indian & Alaska Native (Hispanic) (4.09%), Two+ (Non-Hispanic) (2.05%), and White (Hispanic) (0.195%). 0% of the households in Mellette County, SD speak a non-English language at home as their primary language, and 100% of the residents in Mellette County, SD are U.S. citizens.
In 2019, the median property value in Mellette County, SD was $32,100, and the homeownership rate was 69.4%. Most people in Mellette County, SD drove alone to work, and the average commute time was 19.5 minutes. The average car ownership in Mellette County, SD was 3 cars per household.