Twin Brooks is a town in Grant County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 0.41 square miles (1.06 km2), all land.

25.9% of all households were made up of individuals, and 11.1% had someone living alone who was 65 years of age or older.

20.8% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.

There were 10.5% of families and 13.3% of the population living below the poverty line, including 30.0% of under eighteens and 16.7% of those over 64.