- Gates of the Arctic NP@ (2)
- Gateway NRA@ (1)
- General Grant NM@ (1)
- George Rogers Clark NHP@ (1)
- George Washington Birthplace NM@ (1)
- George Washington Memorial Parkway@ (1)
- Gettysburg NMP@ (1)
- Gila Cliff Dwellings NM@ (1)
- Glacier Bay NP@ (9)
- Glacier NP@ (8)
- Glen Canyon NRA@ (4)
- Glen Echo Park@ (2)
- Gloria Dei Church NHS@ (1)
- Golden Gate NRA@ (2)
- Golden Spike NHS@ (3)
- Grand Canyon NP@ (51)
- Grand Portage NM@ (1)
- Grand Staircase- Escalante National Monument@ (4)
- Grand Teton NP@ (8)
- Grant-Kohrs Ranch NHS@ (1)
- Great Basin NP@ (6)
- Great Egg Harbor NSR@ (1)
- Great Sand Dunes NM@ (2)
- Great Smoky Mountains NP@ (25)
- Green Springs NHLD@ (1)
- Greenbelt Park@ (1)
- Guadalupe Mountains NP@ (7)
- Guilford Courthouse NMP@ (1)
- Gulf Islands NS@ (1)
- James A. Garfield NHS@ (1)
- Ulysses S. Grant NHS@ (1)
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