| Nom du Parc | Etat/Ville | Type du Parc |
| Padre Island National Seashore | Texas (Corpus Christi) | National Seashore |
| Painted desert | Arizona (Flagstaff) | Désert |
| Palo Alto Battlefield National Historic Site | Texas (Brownsville) | National Historic Site |
| Palo Duro Canyon State Park | Texas (Amarillo) | State Park |
| Parashant National Monument | Arizona (Northern Arizona) | National Monument |
| Pea Ridge National Military Park | Arkansas (Pea Ridge) | National Military Park |
| Pecos National Historical Park | Nouveau Mexique (Pecos) | National Historical Park |
| Peirce Mill | Columbia (district) (Washington) | |
| Pennsylvania Avenue National Historic Site | Columbia (district) (Washington) | National Historic Site |
| Perry's Victory & International Peace Memorial | Ohio (Put-in-Bay) | Memorial |
| Petersburg National Battlefield | Virginie (Petersburg) | National Battlefield |
| Petrified Forest National Park | Arizona (Winslow) | National Park |
| Petroglyph National Monument | Nouveau Mexique (Albuquerque) | National Monument |
| Pictured Rocks National Lakeshore | Michigan (Munising) | National Lakeshore |
| Pinnacles National Monument | Californie (Paicines) | National Monument |
| Pipe Spring National Monument | Arizona (Arizona et Utah) | National Monument |
| Pipestone National Monument | Minnesota (Pipestone) | National Monument |
| Piscataway Park | Maryland (Accokeek) | Park |
| Point Reyes National Seashore | Californie (Point Reyes) | National Seashore |
| Pony Express National Historic Trail | (Californie, Colorado, Kansas etc...) | National Historic Trail |
| Poplar Grove National Cemetery | Virginie (Petersburg) | National Cemetery |
| Port Chicago Naval Magazine National Memorial | Californie (Concord Naval Weapons Station) | National Memorial |
| Potomac Heritage National Scenic Trail | (Concord Naval Weapons Station) | National Scenic Trail |
| Poverty Point National Monument | Louisiane (Epps) | National Monument |
| President's Park (White House) | Columbia (district) (Washington) | |
| Presidio of San Francisco | Californie (San Francisco) | |
| Prince William Forest Park | Virginie (Washington D.C) | Park |
| Pu`uhonua O Honaunau National Historical Park | Hawaii (Honaunau) | National Historical Park |
| Puukohola Heiau National Historic Site | Hawaii (Kawaihae) | National Historic Site |
Liste des parcs nationaux usa classée par type (PDF)
Liste des parcs nationaux usa classée par type
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