Lake Poinsett, South Dakota

Lake Poinsett is a census-designated place (CDP) in Hamlin and Brookings counties in South Dakota, United States. The population was 501 at the 2020 census.

Geography
The Lake Poinsett CDP comprises the lake of the same name and its shoreside communities in Hamlin and Brookings counties. U.S. Route 81 passes through the CDP along the western shore of the lake and leads north 24 mi to Watertown and south 13 mi to Arlington.

According to the United States Census Bureau, the Lake Poinsett CDP has a total area of 46.0 km2, of which 13.5 sqkm is land and 32.5 sqkm, or 70.67%, is water.