Lakes / South Dakota / Lake County / Lake Madison
Lake Madison, South Dakota
2,763.52 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
43.96 degrees N, 97.02 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 Lake Madison Stacks Up
- Larger than 96% of the 533 lakes counted in South Dakota.
- The largest lake in Lake County among those counted.
- About 32 miles from Sioux Falls, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Long Lake | Lake | 1.9 mi | 192 acres |
| Round Lake | Lake | 2.7 mi | 179.4 acres |
| Brant Lake | Lake | 4.4 mi | 1,033.39 acres |
| Milwaukee Lake | Lake | 5.1 mi | 89.21 acres |
| Buffalo Slough | Lake | 7.1 mi | 246.86 acres |
| Herman Slough | Lake | 7.4 mi | 26.93 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Madison
How Big Is Lake Madison?
Lake Madison covers 2,763.52 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 130994627). Verified October 30, 2026.