| Nom du Parc | Etat/Ville | Type du Parc |
|---|---|---|
| Galveston Island State Park | Texas (Galveston) | State Park |
| Gamble Plantation Historic State Park | Floride (Ellenton) | State Park |
| Gambrill State Park | Maryland (Frederick) | State Park |
| Gantry Plaza State Park | New York (Long Island City) | State Park |
| Gardner Lake State Park | Connecticut (Salem) | State Park |
| Garner State Park | Texas (Concan) | State Park |
| Garrapata State Park | Californie (Carmel-by-the-Sea) | State Park |
| Gasparilla Island State Park | Floride (Boca Grande) | State Park |
| Gates Of The Arctic National Park & Preserve | Alaska (Bettles) | National Park & Preserve |
| Gateway Arch National Park | Missouri (St. Louis) | National Park |
| Gateway National Recreation Area | New York (Brooklyn, Queens et Staten Island, New York and Monmouth County et New Jersey) | National Recreation Area |
| Gathland State Park | Maryland (Jefferson) | State Park |
| Gauley River National Recreation Area | Virginie-Occidentale (Summersville) | National Recreation Area |
| Gaviota State Park | Californie (Las Cruces) | State Park |
| Gay City State Park | Connecticut (Hebron) | State Park |
| Gebhard Woods State Park | Illinois (Morris) | State Park |
| General Burnside Island State Park | Kentucky (Burnside) | State Park |
| General Coffee State Park | Georgie (Nicholls) | State Park |
| General Grant National Memorial | New York (New York) | National Memorial |
| Genesee Valley Greenway State Park | New York (Castile) | State Park |
| Geneva State Park | Ohio (Geneva) | State Park |
| Geode State Park | Iowa (Danville) | State Park |
| George Dudley Seymour State Park | Connecticut (Haddam) | State Park |
| George H. Crosby Manitou State Park | Minnesota (Silver Bay) | State Park |
| George L. Smith State Park | Georgie (Twin City) | State Park |
| George Mason Memorial | Columbia (district) (Washington) | Memorial |
| George P. Cossar State Park | Mississippi (Oakland) | State Park |
| George Rogers Clark National Historical Park | Indiana (Vincennes) | National Historical Park |
| George T. Bagby State Park | Georgie (Fort Gaines) | State Park |
| George Waldo State Park | Connecticut (Southbury) | State 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 |
| George Wyth Memorial State Park | Iowa (Waterloo) | State Park |
| Georgia Veterans State Park | Georgie (Cordele) | State Park |
| Gettysburg National Cemetery | Pennsylvanie (Gettysburg) | National Cemetery |
| Gettysburg National Military Park | Pennsylvanie (Gettysburg) | National Military Park |
| Giant City State Park | Illinois (Makanda) | State Park |
| Giant Springs State Park | Montana (Great Falls) | State Park |
| Gifford Pinchot State Park | Pennsylvanie (Lewisberry) | State Park |
| Gifford Woods State Park | Vermont (Killington) | State Park |
| Gila Cliff Dwellings National Monument | Nouveau Mexique (Silver City) | National Monument |
| Gilbert Lake State Park | New York (Laurens) | State Park |
| Gilchrist Blue Springs State Park | Floride (High Springs) | State Park |
| Gilgo State Park | New York (Babylon) | State Park |
| Gillette Castle State Park | Connecticut (East Haddam) | State Park |
| Givhans Ferry State Park | Caroline du Sud (Ridgeville) | State Park |
| Glacial Lakes State Park | Minnesota (Starbuck) | State Park |
| 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 |
| Glendalough State Park | Minnesota (Battle Lake) | State Park |
| Glendo State Park | Wyoming (Glendo) | State Park |
| Glimmerglass State Park | New York (Cooperstown) | State Park |
| Gloria Dei Church National Historic Site | Pennsylvanie (Philadelphia) | National Historic Site |
| Goblin Valley | Utah (Hanksville) | State Park |
| Goddard Memorial State Park | Rhode Island (Warwick) | State Park |
| Gold Butte National Monument | Nevada (Riverside) | National Monument |
| Golden Gate Canyon State Park | Colorado (Black Hawk) | State Park |
| Golden Gate National Recreation Area | Californie (San Francisco) | National Recreation Area |
| Golden Hill State Park | New York (Barker) | State Park |
| Golden Memorial State Park | Mississippi (Walnut Grove) | State Park |
| Golden Spike National Historic Site | Utah (Brigham City) | National Historic Site |
| Goliad State Park & Historic Site | Texas (Goliad) | State Park |
| Good Earth State Park | Dakota du Sud (Sioux Falls) | State Park |
| Goodale State Park | Caroline du Sud (Camden) | State Park |
| Goose Creek State Park | Caroline du Nord (Greenville) | State Park |
| Goose Island State Park | Texas (Rockport) | State Park |
| Gooseberry Falls State Park | Minnesota (Two Harbors) | State Park |
| Goosenecks State Park | Utah (Mexican Hat) | State Park |
| Goosepond Mountain State Park | New York (Chester) | State Park |
| Gorges State Park | Caroline du Nord (Sapphire) | State Park |
| Gouldsboro State Park | Pennsylvanie (Gouldsboro) | State Park |
| Governor Dodge State Park | Wisconsin (Dodgeville) | State Park |
| Governor Nelson State Park | Wisconsin (Waunakee) | State Park |
| Governor Thompson State Park | Wisconsin (Crivitz) | State Park |
| Governors Island National Monument | New York (New York) | National Monument |
| Grafton Lakes State Park | New York (Grafton) | State Park |
| Grafton Notch State Park | Maine (Newry) | State Park |
| Graham Cave State Park | Missouri (Danville) | State Park |
| Grahams Island State Park | Dakota du Nord (Devils Lake) | State Park |
| Grand Canyon National Park | Arizona (Grand Canyon Village) | National Park |
| Grand Canyon-Parashant National Monument | Arizona (St. George) | National Monument |
| Grand Gulf State Park | Missouri (Thayer) | State Park |
| Grand Haven State Park | Michigan (Grand Haven) | State Park |
| Grand Isle State Park | Louisiane (Grand Isle) | State Park |
| Grand Isle State Park | Vermont (Grand Isle) | State Park |
| Grand Lake St. Marys State Park | Ohio (St Marys) | State Park |
| Grand Mere State Park | Michigan (Stevensville) | State Park |
| Grand Portage National Monument | Minnesota (Grand Portage) | National Monument |
| Grand Portage State Park | Minnesota (Grand Portage) | State Park |
| Grand Staircase-Escalante NM | Utah (Kanab) | National Monument |
| Grand Teton National Park | Wyoming (Moran à l'est et Jackson à l'ouest) | National Park |
| Grandfather Mountain State Park | Caroline du Nord (Boone) | State Park |
| Granite Ghost Town State Park | Montana (Whitehall) | State Park |
| Granite Mountain Hotshots Memorial State Park | Arizona (Congress) | State Park |
| Grant-Kohrs Ranch National Historic Site | Montana (Deer Lodge) | National Historic Site |
| Grass Point State Park | New York (Alexandria Bay) | State Park |
| Grayland Beach State Park | Washington (Grayland) | State Park |
| Grayson Highlands State Park | Virginie (Mouth of Wilson) | State Park |
| Grayson Lake State Park | Kentucky (Olive Hill) | State Park |
| Grayton Beach State Park | Floride (Santa Rosa Beach) | State Park |
| Great Basin National Park | Nevada (Baker) | National Park |
| Great Brook Farm State Park | Massachusetts (Carlisle) | State Park |
| Great Council State Park | Ohio (Xenia) | State Park |
| Great Falls Park | Virginie (McLean) | Park |
| Great Plains State Park | Oklahoma (Mountain Park) | State Park |
| Great River Bluffs State Park | Minnesota (Winona) | State Park |
| Great River Road State Park | Mississippi (Rosedale) | State Park |
| Great Salt Lake State Park | Utah (Magna) | State Park |
| Great Sand Dunes National Park and Preserve | Colorado (Alamosa) | National Monument & Preserve |
| Great Seal State Park | Ohio (Chillicothe) | State Park |
| Great Smoky Mountains National Park | Tennessee (Tenessee et Caroline du nord) | National Park |
| Great Valley Grasslands State Park | Californie (Modesto) | State Park |
| Green Lakes State Park | New York (Fayetteville) | State Park |
| Green River Lake State Park | Kentucky (Campbellsville) | State Park |
| Green River Reservoir State Park | Vermont (Hyde Park) | State Park |
| Green River State Park | Utah (Green River) | State Park |
| Green Springs | Virginie (Louisa County) | |
| Green Valley State Park | Iowa (Creston) | State Park |
| Greenbelt Park | Maryland (Greenbelt) | Park |
| Greenbrier State Park | Maryland (Boonsboro) | State Park |
| Greenfield State Park | New Hampshire (Greenfield) | State Park |
| Greenleaf State Park | Oklahoma (Braggs) | State Park |
| Greenwell State Park | Maryland (Hollywood) | State Park |
| Greenwood Furnace State Park | Pennsylvanie (Huntingdon) | State Park |
| Greycliff Prairie Dog Town State Park | Montana (Billings) | State Park |
| Griffiths-Priday State Park | Washington (Ocean Shores) | State Park |
| Grizzly Creek Redwoods State Park | Californie (Riverside Park) | State Park |
| Grover Hot Springs State Park | Californie (Markleeville) | State Park |
| Guadalupe Mountains National Park | Texas (Dell City) | National Park |
| Guadalupe River State Park | Texas (Spring Branch) | State Park |
| Guernsey State Park | Wyoming (Guernsey) | State Park |
| Guilford Courthouse National Military Park | New York (Greensboro) | National Military Park |
| Guilford Lake State Park | Ohio (Lisbon) | State Park |
| Gulf Islands National Seashore | Mississippi (Gulf Breeze, Florida and Ocean Springs, Mississippi (plusieurs états)) | National Seashore |
| Gulf State Park | Alabama (Foley) | State Park |
| Gull Point State Park | Iowa (Milford) | State Park |
| Gunlock State Park | Utah (Gunlock) | State Park |
| Gunpowder Falls State Park | Maryland (Kingsville) | State Park |
| Guy W. Talbot – Latourell Falls Trailhead State Park | Oregon (Portland) | State Park |
