Lakes / Illinois / Madison County / Long Lake
Long Lake, Madison County, Illinois
46.7 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.78 degrees N, 90.09 degrees W - Madison 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 Long Lake Stacks Up
- Larger than 34% of the 511 lakes counted in Illinois.
- About 73 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Long Lake | Madison | 2.8 mi | 62.27 acres |
| Tower Lake | Madison | 5.2 mi | 71.17 acres |
| Horseshoe Lake | Madison | 5.8 mi | 1,426.29 acres |
| McDonough Lake | Madison | 6.4 mi | 60.79 acres |
| Canteen Lake | Madison | 7.5 mi | 96.87 acres |
| Dunlap Lake | Madison | 8.8 mi | 106.01 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Long Lake
How Big Is Long Lake?
Long Lake covers 46.7 acres in Madison County, Illinois.
What Is the Largest Lake in Madison County?
Horseshoe Lake is the largest lake in Madison County, at 1,426.29 acres.
Largest Lakes in Illinois
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Carlyle Lake | Clinton | 22,796.77 acres | - |
| 2 | Mine Number 21 Reservoir | Franklin | 17,062.04 acres | - |
| 3 | Upper Peoria Lake | Woodford | 15,460.64 acres | - |
| 4 | Lake Shelbyville | Shelby | 10,235.1 acres | - |
| 5 | Crab Orchard Lake | Williamson | 7,292.57 acres | - |
All 511 Illinois lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 120032889). Verified October 30, 2026.