Lakes / Illinois / McHenry County / Lake Killarney
Lake Killarney, Illinois
59.55 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
42.24 degrees N, 88.26 degrees W - McHenry 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 Killarney Stacks Up
- Larger than 43% of the 511 lakes counted in Illinois.
- About 41 miles from Chicago, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Silver Lake | McHenry | 0.6 mi | 43.74 acres |
| Vulcan Lakes | McHenry | 2.9 mi | 275.77 acres |
| Slocum Lake | Lake | 3.8 mi | 209.55 acres |
| Griswold Lake | McHenry | 4.0 mi | 153.45 acres |
| Island Lake | Lake | 4.0 mi | 80.31 acres |
| Crystal Lake | McHenry | 5.0 mi | 230.06 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Killarney
How Big Is Lake Killarney?
Lake Killarney covers 59.55 acres in McHenry County, Illinois.
What Is the Largest Lake in McHenry County?
Pistakee Lake is the largest lake in McHenry County, at 1,743.58 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 121627945). Verified October 30, 2026.