Long Lake, South Dakota
Long Lake 
    mdé háŋska  | |
|---|---|
| Long Lake, South Dakota | |
Location in McPherson County and the state of South Dakota  | |
| Coordinates: 45°51′24″N 99°12′21″W / 45.85667°N 99.20583°W | |
| Country | United States | 
| State | South Dakota | 
| County | McPherson | 
| Incorporated | 1947 | 
| Area | |
 • Total  | 0.28 sq mi (0.72 km2) | 
| • Land | 0.28 sq mi (0.72 km2) | 
| • Water | 0.00 sq mi (0.00 km2) | 
| Elevation | 1,952 ft (595 m) | 
| Population  (2020)  | |
 • Total  | 27 | 
| • Density | 97.47/sq mi (37.60/km2) | 
| Time zone | UTC-6 (Central (CST)) | 
| • Summer (DST) | UTC-5 (CDT) | 
| ZIP code | 57457  | 
| Area code | 605 | 
| FIPS code | 46-38860 | 
| GNIS feature ID | 1267464 | 
Long Lake (Dakota: mdé háŋska; "lake long") is a town in McPherson County, South Dakota, United States. The population was 27 at the 2020 census.
The town took its name from the local Long Lake.