In 2023, Brant Lake, SD had a population of 68 people with a median age of 66.3 and a median household income of $123,750. Between 2022 and 2023 the population of Brant Lake, SD declined from 76 to 68, a −10.5% decrease and its median household income grew from $96,389 to $123,750, a 28.4% increase.
The 5 largest ethnic groups in Brant Lake, SD are White (Non-Hispanic) (97.1%), Two Races Excluding Other, & Three or More Races (Non-Hispanic) (2.94%), Black or African American (Non-Hispanic) (0%), American Indian & Alaska Native (Non-Hispanic) (0%), and Asian (Non-Hispanic) (0%).
None of the households in Brant Lake, 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 Brant Lake, SD are U.S. citizens.
In 2023, the median property value in Brant Lake, SD was $422,200, and the homeownership rate was 96.3%.