| Official Name: | Lake Poinsett, South Dakota |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota |
| Pushpin Label: | Lake Poinsett |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hamlin, Brookings |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 46.03 |
| Area Land Km2: | 12.66 |
| Area Water Km2: | 33.37 |
| Area Total Sq Mi: | 17.77 |
| Area Land Sq Mi: | 4.89 |
| Area Water Sq Mi: | 12.88 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 501 |
| Population Density Km2: | 39.57 |
| Population Density Sq Mi: | 102.50 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 44.5664°N -97.0797°W |
| Elevation Ft: | 1641 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-35480[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2584558 |
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.[4]
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 to Watertown and south to Arlington.
According to the United States Census Bureau, the Lake Poinsett CDP has a total area of 46km2, of which 13.5sqkm is land and 32.5sqkm, or 70.67%, is water.[5]