Lakes / Indiana / Marshall County / Flat Lake
Flat Lake, Indiana
57.1 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Indiana
41.33 degrees N, 86.44 degrees W - Marshall 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 Flat Lake Stacks Up
- Larger than 46% of the 425 lakes counted in Indiana.
- About 26 miles from South Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Gilbert Lake | Marshall | 0.7 mi | 37.1 acres |
| Eagle Lake | Starke | 2.4 mi | 31.83 acres |
| Lake Latonka Dam | Marshall | 2.5 mi | 88.04 acres |
| Pretty Lake | Marshall | 3.3 mi | 95.82 acres |
| Zehner Millpond | Marshall | 3.3 mi | 128.56 acres |
| Holem Lake | Marshall | 4.1 mi | 109.17 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Flat Lake
How Big Is Flat Lake?
Flat Lake covers 57.1 acres in Marshall County, Indiana.
What Is the Largest Lake in Marshall County?
Lake Maxinkuckee is the largest lake in Marshall County, at 1,909.81 acres.
Largest Lakes in Indiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Monroe Lake | Monroe | 11,112.45 acres | - |
| 2 | Patoka Lake | Orange | 9,120.83 acres | - |
| 3 | Brookville Lake | Franklin | 4,364.22 acres | - |
| 4 | Lake Wawasee | Kosciusko | 3,426.28 acres | - |
| 5 | Broad Pond | Gibson | 2,941.52 acres | - |
All 425 Indiana lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 123166758). Verified October 30, 2026.