Public Sites
| State | County | Name |
|---|---|---|
| Illinois | Macoupin | Medora |
| Iowa | Warren | Medora Prairie |
| Iowa | Story | Meetz |
| Iowa | Dickinson | Memorial Park, Spirit Lake |
| Iowa | Guthrie | Menlo |
| Iowa | Pocahontas | Meredith Park |
| Illinois | Morgan | Meredosia Hill Prairie Nature Preserve |
| Iowa | Tama | Mericle Woods State Preserve |
| Iowa | Cherokee | Meriden |
| Iowa | Winneshiek | Merlin Moe Park |
| Iowa | Howard | Merricks Pond Access Wildlife Area |
| Iowa | Clayton | Merritt Forest State Preserve |
| Florida | Brevard | Merritt Island National Wildlife Refuge |
| Colorado | Pueblo | Mesa Junction |
| Ohio | Butler | Miami University Ecology Research Center |
| Iowa | Scott | Middle Park |
| Iowa | Madison | Middle River Park |
| Iowa | Jefferson | Middle Walnut Creek |
| Iowa | Woodbury | Midway County Park |
| Iowa | Cerro Gordo | Mike Zack Wildlife Area |
| Illinois | Rock Island | Milan |
| Iowa | Buchanan | Milbach Prairie |
| Iowa | Mills | Mile Hill Lake Park |
| Iowa | Allamakee | Mile Long Prairie |
| Iowa | Dickinson | Milford |