Brant Lake
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 0.155
- State:
- South Dakota
Brant Lake is a city located in Lake County, South Dakota. Brant Lake has a 2026 population of 56. Brant Lake is currently declining at a rate of 0% annually and its population has decreased by -1.75% since the most recent census, which recorded a population of 57 in 2020.
The median household income in Brant Lake is $104,318 with a poverty rate of 0%. The median age in Brant Lake is 66.2 years: 66.4 years for males, and 61.7 years for females. For every 100 females there are 215.0 males.