| Nom du Parc | Etat/Ville | Type du Parc |
| Maggie L Walker National Historic Site | Virginie (Richmond) | National Historic Site |
| Maine Acadian Culture | Maine (St. John Valley) | |
| Mammoth Cave National Park | Kentucky (Mammoth Cave) | National Park |
| Manassas National Battlefield Park | Virginie (Manassas) | National Battlefield Park |
| Manhattan Sites | New York (New York) | |
| Manzanar National Historic Site | Californie (Independence) | National Historic Site |
| Marsh - Billings - Rockefeller National Historical Park | Vermont (Woodstock) | National Historical Park |
| Martin Luther King Jr National Historic Site | Georgie (Atlanta) | National Historic Site |
| Martin Van Buren National Historic Site | New York (Kinderhook) | National Historic Site |
| Mary McLeod Bethune Council House National Historic Site | Columbia (district) (Washington) | National Historic Site |
| Mesa Verde National Park | Colorado (Cortez ou Mancos) | National Park |
| Meteor Crater | Arizona (Winslow) | RV Park |
| Minidoka Internment National Monument | Idaho (Jerome) | National Monument |
| Minute Man National Historical Park | Massachusetts (Concord, Lincoln, Lexington) | National Historical Park |
| Minuteman Missile National Historic Site | Dakota du Sud (Southwestern) | National Historic Site |
| Mississippi National River & Recreation Area | Minnesota (Twin Cities Metropolitan Area) | National River & Recreation Area |
| Missouri National Recreational River | Dakota du Sud (Yankton) | National Recreational River |
| Mojave National Preserve | Californie (Primm au nord, Barstow à l'est et Needles au sud) | National Preserve |
| Monocacy National Battlefield | Maryland (Frederick) | National Battlefield |
| Montezuma Castle National Monument | Arizona (Camp Verde) | Castle National Monument |
| Monument Valley Navajo Tribal Park | Arizona (Bluff et Mexican Hat en Utah et Kayenta en Arizona) | Navajo Tribal Park |
| Moores Creek National Battlefield | Caroline du Nord (Currie) | National Battlefield |
| Mormon Pioneer National Historic Trail | Iowa (De l'illinois au Wyoming) | National Historic Trail |
| Morristown National Historical Park | New Jersey (Morristown) | National Historical Park |
| Mount Rainier National Park | Washington (Seattle, Tacoma, Yakima et Portland en Oregon) | National Park |
| Mount Rushmore National Memorial | Dakota du Sud (Keystone) | National Memorial |
| Muir Woods National Monument | Californie (San Francisco) | National Monument |
