| Nom du Parc | Etat/Ville | Type du Parc |
| Gates Of The Arctic National Park & Preserve | Alaska (Bettles) | National Park & Preserve |
| Gateway National Recreation Area | New York (Brooklyn, Queens et Staten Island, New York and Monmouth County et New Jersey) | National Recreation Area |
| Gauley River National Recreation Area | Virginie-Occidentale (Summersville) | National Recreation Area |
| General Grant National Memorial | New York (New York) | National Memorial |
| George Mason Memorial | Columbia (district) (Washington) | Memorial |
| George Rogers Clark National Historical Park | Indiana (Vincennes) | National Historical Park |
| George Washington Birthplace National Monument | Virginie (Westmoreland County) | National Monument |
| George Washington Carver National Monument | Missouri (Diamond) | National Monument |
| George Washington Memorial Parkway | New York (Diamond) | Memorial Parkway |
| Gettysburg National Cemetery | Pennsylvanie (Gettysburg) | National Cemetery |
| Gettysburg National Military Park | Pennsylvanie (Gettysburg) | National Military Park |
| Gila Cliff Dwellings National Monument | Nouveau Mexique (Silver City) | National Monument |
| Glacier Bay National Park and Preserve | Alaska (Juneau) | National Park & Preserve |
| Glacier National Park | Montana (Kalispell à l'ouest et Browning à l'est) | National Park |
| Glen Canyon National Recreation Area et Lake Powell | Utah (Page) | National Recreation Area |
| Glen Echo Park | Maryland (Glen Echo) | Park |
| Gloria Dei Church National Historic Site | Pennsylvanie (Philadelphia) | National Historic Site |
| Goblin Valley | Utah (Hanksville) | State Park |
| Gold Butte National Monument | Nevada (Riverside) | National Monument |
| Golden Gate National Recreation Area | Californie (San Francisco) | National Recreation Area |
| Golden Spike National Historic Site | Utah (Brigham City) | National Historic Site |
| Goosenecks State Park | Utah (Mexican Hat) | State Park |
| Governors Island National Monument | New York (New York) | National Monument |
| Grand Canyon National Park | Arizona (Grand Canyon Village) | National Park |
| Grand Canyon-Parashant National Monument | Arizona (Northern Arizona) | National Monument |
| Grand Portage National Monument | Nouveau Mexique (Grand Portage) | National Monument |
| Grand Staircase-Escalante NM | Utah (Kanab) | National Monument |
| Grand Teton National Park | Wyoming (Moran à l'est et Jackson à l'ouest) | National Park |
| Grant-Kohrs Ranch National Historic Site | Montana (Deer Lodge) | National Historic Site |
| Great Basin National Park | Nevada (Baker) | National Park |
| Great Falls Park | Virginie (McLean) | Park |
| Great Sand Dunes National Park and Preserve | Colorado (Alamosa) | National Monument & Preserve |
| Great Smoky Mountains National Park | Tennessee (Tenessee et Caroline du nord) | National Park |
| Green Springs | Virginie (Louisa County) | |
| Greenbelt Park | Maryland (Greenbelt) | Park |
| Guadalupe Mountains National Park | Texas (Dell City) | National Park |
| Guilford Courthouse National Military Park | New York (Greensboro) | National Military Park |
| Gulf Islands National Seashore | Mississippi (Gulf Breeze, Florida and Ocean Springs, Mississippi (plusieurs états)) | National Seashore |
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