Lakes / Illinois / Morgan County / Lake Jacksonville
Lake Jacksonville, Illinois
461.59 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
39.67 degrees N, 90.20 degrees W - Morgan 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 Jacksonville Stacks Up
- Larger than 86% of the 511 lakes counted in Illinois.
- About 30 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Mauvaise Terre Lake | Morgan | 2.9 mi | 158.89 acres |
| Waverly City Lake | Morgan | 11 mi | 60.95 acres |
| White Hall Reservoir | Greene | 19 mi | 41.02 acres |
| Palmyra-Modesto City Lake | Macoupin | 20 mi | 36.57 acres |
| Sudduth Lake | Sangamon | 20 mi | 36.82 acres |
| Bunn Lake | Macoupin | 22 mi | 78.33 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Jacksonville
How Big Is Lake Jacksonville?
Lake Jacksonville covers 461.59 acres in Morgan County, Illinois.
What Is the Largest Lake in Morgan County?
Meredosia Lake is the largest lake in Morgan County, at 1,404.55 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 156102438). Verified October 30, 2026.