Lakes / Iowa / Winnebago County / Harmon Lake
Harmon Lake, Iowa
41 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Iowa
43.47 degrees N, 93.70 degrees W - Winnebago 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 Harmon Lake Stacks Up
- Larger than 18% of the 220 lakes counted in Iowa.
- About 73 miles from Okoboji, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Rice Lake | Worth | 11 mi | 891 acres |
| Silver Lake | Worth | 14 mi | 314 acres |
| Crystal Lake | Hancock | 17 mi | 260 acres |
| Lake George | Hancock | 19 mi | 45 acres |
| Mallard Marsh Swamp | Cerro Gordo | 20 mi | 31 acres |
| Eagle Lake | Hancock | 23 mi | 434 acres |
Straight-line distance between lake centers.
Facts and Figures
Largest Lakes in Iowa
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Rathbun Lake | Appanoose | 13,869 acres | - |
| 2 | Lake Red Rock | Marion | 8,619 acres | - |
| 3 | Spirit Lake | Dickinson | 5,463 acres | - |
| 4 | Saylorville Lake | Polk | 5,428 acres | - |
| 5 | Clear Lake | Cerro Gordo | 3,632 acres | - |
All 220 Iowa lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 130642960). Verified October 30, 2026.