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.
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.
Lyman County, SD borders Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Gregory County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Mellette County, SD, Stanley County, SD, and Tripp County, SD.