Lakes / Illinois / Franklin County / Thompsonville Lake
Thompsonville Lake, Illinois
43.98 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.95 degrees N, 88.75 degrees W - Franklin 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 Thompsonville Lake Stacks Up
- Larger than 31% of the 511 lakes counted in Illinois.
- About 30 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| New City Lake | Franklin | 4.0 mi | 205.53 acres |
| West Frankfort Reservoir | Franklin | 5.3 mi | 158.64 acres |
| Lake Moses | Franklin | 8.5 mi | 159.63 acres |
| Harrisburg Reservoir | Saline | 11 mi | 158.42 acres |
| Lake Hamilton | Franklin | 11 mi | 33.11 acres |
| Lake Number 5 | Williamson | 12 mi | 26.69 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Thompsonville Lake
How Big Is Thompsonville Lake?
Thompsonville Lake covers 43.98 acres in Franklin County, Illinois.
What Is the Largest Lake in Franklin County?
Mine Number 21 Reservoir is the largest lake in Franklin County, at 17,062.04 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 48795334). Verified October 30, 2026.