Lakes / Illinois / Warren County / Lake Warren
Lake Warren, Illinois
42.26 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
41.00 degrees N, 90.64 degrees W - Warren 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 Warren Stacks Up
- Larger than 29% of the 511 lakes counted in Illinois.
- About 59 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Citizens Lake | Warren | 6.6 mi | 25.45 acres |
| Lake Storey | Knox | 13 mi | 111.44 acres |
| Rice Lake | Knox | 17 mi | 51.4 acres |
| Lake Bracken | Knox | 18 mi | 142.09 acres |
| Gladstone Lake | Henderson | 20 mi | 26.44 acres |
| Frye Lake | Mercer | 22 mi | 118.86 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Warren
How Big Is Lake Warren?
Lake Warren covers 42.26 acres in Warren County, Illinois.
What Is the Largest Lake in Warren County?
Little Swan Lake is the largest lake in Warren County, at 228.33 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 152592532). Verified October 30, 2026.