Public Sites
| State | County | Name |
|---|---|---|
| Iowa | Lyon | Lyon County |
| Iowa | Johnson | MacBride Nature Recreation Area |
| Iowa | Pottawattamie | Macedonia |
| Arizona | Santa Cruz | Madera Canyon, Santa Rita Lodge |
| Iowa | Madison | Madison County |
| Iowa | Boone | Madrid |
| Iowa | Marshall | Mag Holland Access |
| Ohio | Ottawa | Magee East Marina and Campground |
| Ohio | Ottawa | Magee Marsh Wildlife Area |
| Iowa | Harrison | Magnolia |
| Iowa | Mahaska | Mahaska County |
| Iowa | Winneshiek | Malanaphy Springs |
| Iowa | Winneshiek | Malanaphy Springs State Preserve |
| Iowa | Jones | Mallard Marsh |
| Iowa | Cerro Gordo | Mallard Marsh Wildlife Area |
| Iowa | Clinton | Malone Park |
| Iowa | Mills | Malvern |
| Iowa | Hardin | Man Wilderness Area State Preserve |
| Iowa | Delaware | Manchester |
| Iowa | Delaware | Manchester Fish Hatchery |
| Iowa | Linn | Manhattan / Robbins Lake Park |
| Iowa | Clinton | Manikowski Prairie State Preserve |
| Iowa | Worth | Manly |
| Iowa | Marshall | Mann Property |
| Iowa | Calhoun | Manson |