Lakes / Illinois / Knox County / Green Oaks Lake
Green Oaks Lake, Illinois
30.15 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
40.98 degrees N, 90.09 degrees W - Knox 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 Green Oaks Lake Stacks Up
- Larger than 11% of the 511 lakes counted in Illinois.
- About 33 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Spoon Lake | Knox | 2.3 mi | 546.84 acres |
| Snakeden Hollow Lake | Knox | 2.4 mi | 150.98 acres |
| Lake Windsor | Knox | 3.4 mi | 38.05 acres |
| Old Garage Lake | Knox | 4.3 mi | 25.2 acres |
| Lake Calhoun | Knox | 9.7 mi | 31.88 acres |
| Rice Lake | Knox | 12 mi | 51.4 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Green Oaks Lake
How Big Is Green Oaks Lake?
Green Oaks Lake covers 30.15 acres in Knox County, Illinois.
What Is the Largest Lake in Knox County?
Spoon Lake is the largest lake in Knox County, at 546.84 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 154347801). Verified October 30, 2026.