Long Lake (Dakota: mdé háŋska;[5] "lake long") is a town in McPherson County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 0.28 square miles (0.73 km2), all land.

50.0% of all households were made up of individuals, and 33.3% had someone living alone who was 65 years of age or older.

51.7% of all households were made up of individuals, and 34.5% had someone living alone who was 65 years of age or older.

There were 53.8% of families and 60.0% of the population living below the poverty line, including 100.0% of under eighteens and 40.0% of those over 64.