Lakes / Illinois / Williamson County / Sweet Lake
Sweet Lake, Illinois
36.57 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
37.83 degrees N, 88.91 degrees W - Williamson 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 Sweet Lake Stacks Up
- Larger than 22% of the 511 lakes counted in Illinois.
- About 18 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Number 5 | Williamson | 0.9 mi | 26.69 acres |
| Fresh Water Lake | Williamson | 2.6 mi | 35.83 acres |
| Johnston City Lake | Williamson | 3.2 mi | 59.8 acres |
| West Frankfort Reservoir | Franklin | 6.8 mi | 158.64 acres |
| Cambon Lake | Franklin | 7.3 mi | 36.08 acres |
| New City Lake | Franklin | 8.1 mi | 205.53 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Sweet Lake
How Big Is Sweet Lake?
Sweet Lake covers 36.57 acres in Williamson County, Illinois.
What Is the Largest Lake in Williamson County?
Crab Orchard Lake is the largest lake in Williamson County, at 7,292.57 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 48802152). Verified October 30, 2026.