In 2019, Lyman County, SD had a population of 3.85k people with a median age of 35.5 and a median household income of $53,862. Between 2018 and 2019 the population of Lyman County, SD declined from 3,869 to 3,848, a −0.543% decrease and its median household income grew from $53,263 to $53,862, a 1.12% increase.
The 5 largest ethnic groups in Lyman County, SD are White (Non-Hispanic) (55.6%), American Indian & Alaska Native (Non-Hispanic) (41.1%), Two+ (Non-Hispanic) (1.25%), White (Hispanic) (0.754%), and Asian (Non-Hispanic) (0.624%). 0% of the households in Lyman County, SD speak a non-English language at home as their primary language, and 99.9% of the residents in Lyman County, SD are U.S. citizens.
In 2019, the median property value in Lyman County, SD was $102,800, and the homeownership rate was 67.2%. Most people in Lyman County, SD drove alone to work, and the average commute time was 11.9 minutes. The average car ownership in Lyman County, SD was 2 cars per household.