Lakes / South Dakota / Lake County / Round Lake
Round Lake, Lake County, South Dakota
179.4 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
43.93 degrees N, 96.98 degrees W - Lake 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 Round Lake Stacks Up
- Larger than 60% of the 533 lakes counted in South Dakota.
- About 30 miles from Sioux Falls, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Long Lake | Lake | 1.4 mi | 192 acres |
| Brant Lake | Lake | 1.7 mi | 1,033.39 acres |
| Lake Madison | Lake | 2.7 mi | 2,763.52 acres |
| Buffalo Slough | Lake | 4.6 mi | 246.86 acres |
| Spring Lake | Lake | 5.4 mi | 55.6 acres |
| Milwaukee Lake | Lake | 5.9 mi | 89.21 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Round Lake
How Big Is Round Lake?
Round Lake covers 179.4 acres in Lake County, South Dakota.
What Is the Largest Lake in Lake County?
Lake Madison is the largest lake in Lake County, at 2,763.52 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 130994829). Verified October 30, 2026.