Public Sites
| State | County | Name |
|---|---|---|
| Iowa | Linn | Mohawk City Park |
| Illinois | Rock Island | Moline |
| Iowa | Linn | Monarch Research Station |
| Iowa | Clayton | Monona |
| Iowa | Monona | Monona County |
| Iowa | Monroe | Monroe County |
| Iowa | Montgomery | Montgomery County |
| Iowa | Jones | Monticello Riverside Flower Gardens |
| Iowa | Jones | Monticello Roller Dam |
| Iowa | Lee | Montrose |
| Iowa | Story | Moore Memorial Park |
| Iowa | Story | Moore Park |
| Iowa | Wayne | Moore-Gosch Memorial Park |
| Iowa | Ida | Moorehead Park |
| Iowa | Monona | Moorhead |
| Iowa | Linn | Morgan Creek Park |
| Iowa | Woodbury | Morningside University |
| Iowa | Van Buren | Morris Memorial County Park |
| Iowa | Wright | Morse Lake Wildlife Management Area |
| Iowa | Clayton | Mossy Glen State Preserve |
| Iowa | Clayton | Motor Mill Historic Site |
| Iowa | Allamakee | Mount Hosmer Park |
| Iowa | Linn | Mount Mercy University |
| Iowa | Union | Mount Pisgah State Preserve |
| Iowa | Henry | Mount Pleasant |