Long Lake
- County:
- McPherson County
- County Seat:
- No
- Area (mi²):
- 0.277
- State:
- South Dakota
Long Lake is a town located in McPherson County, South Dakota. Long Lake has a 2026 population of 26. Long Lake is currently declining at a rate of -3.7% annually and its population has decreased by -3.7% since the most recent census, which recorded a population of 27 in 2020.
The median household income in Long Lake is $61,042 with a poverty rate of 7.14%. The median age in Long Lake is 68.3 years: 68.4 years for males, and 0 years for females. For every 100 females there are 366.7 males.