Lakes / South Dakota / Hamlin County / Lake Poinsett
Lake Poinsett, South Dakota
9,794.52 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.58 degrees N, 97.08 degrees W - Hamlin County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Lake Poinsett Stacks Up
- Ranks #7 for surface area among the South Dakota lakes counted so far - 9,794.52 acres.
- The largest lake in Hamlin County among those counted.
- About 22 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Albert | Kingsbury | 5.0 mi | 3,655.43 acres |
| Lake Mary | Hamlin | 5.2 mi | 190.52 acres |
| Lake Saint John | Hamlin | 5.6 mi | 1,271.11 acres |
| Lake Florence | Hamlin | 5.8 mi | 112.43 acres |
| Lake Norden | Hamlin | 6.2 mi | 711.66 acres |
| Moe Slough | Brookings | 7.5 mi | 104.03 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Poinsett
How Big Is Lake Poinsett?
Lake Poinsett covers 9,794.52 acres in Hamlin County, South Dakota.
What Is the Largest Lake in Hamlin County?
Lake Poinsett is the largest lake in Hamlin County, at 9,794.52 acres.
Largest Lakes in South Dakota
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Oahe | Dewey | 309,912.57 acres | - |
| 2 | Lake Francis Case | Charles Mix | 82,166.92 acres | - |
| 3 | Lake Sharpe | Hughes | 58,419.67 acres | - |
| 4 | Lewis and Clark Lake | Bon Homme | 25,141.99 acres | - |
| 5 | Lake Thompson | Kingsbury | 13,887.93 acres | - |
All 533 South Dakota lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 126758849). Verified October 30, 2026.