Lakes / Illinois / Henderson County / Millman Lake
Millman Lake, Illinois
191.51 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
40.73 degrees N, 91.08 degrees W - Henderson 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 Millman Lake Stacks Up
- Larger than 75% of the 511 lakes counted in Illinois.
- The largest lake in Henderson County among those counted.
- About 78 miles from Peoria, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Carthage Lake | Henderson | 4.5 mi | 83.77 acres |
| Orchard City Lake | Henderson | 5.0 mi | 35.58 acres |
| Crystal Lake | Henderson | 6.6 mi | 184.59 acres |
| Gladstone Lake | Henderson | 9.8 mi | 26.44 acres |
| Linda Lake | Hancock | 19 mi | 39.54 acres |
| Carthage Lake | Hancock | 22 mi | 42.5 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Millman Lake
How Big Is Millman Lake?
Millman Lake covers 191.51 acres in Henderson County, Illinois.
What Is the Largest Lake in Henderson County?
Millman Lake is the largest lake in Henderson County, at 191.51 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 152594121). Verified October 30, 2026.