In 2020, Lyman County, SD had a population of 3.83k people with a median age of 36.1 and a median household income of $54,484. Between 2019 and 2020 the population of Lyman County, SD declined from 3,848 to 3,831, a −0.442% decrease and its median household income grew from $53,862 to $54,484, a 1.15% increase.
The 5 largest ethnic groups in Lyman County, SD are White (Non-Hispanic) (55.6%), American Indian & Alaska Native (Non-Hispanic) (40.1%), White (Hispanic) (1.44%), Two+ (Non-Hispanic) (1.31%), and American Indian & Alaska Native (Hispanic) (0.705%).
None of the households in Lyman 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.
99.6% of the residents in Lyman County, SD are U.S. citizens.
In 2020, the median property value in Lyman County, SD was $109,600, and the homeownership rate was 69.6%.
Most people in Lyman County, SD drove alone to work, and the average commute time was 14.7 minutes. The average car ownership in Lyman County, SD was 2 cars per household.