The United States of America has 59 recognized areas known to the national public as national parks. All these areas are operated by the National Park Service, which is an agency of the Department of the Interior. Here is the National Park List
The oldest National Park is considered the Yellowstone National Park and the most recent one is Pinnacles National Park. You can find a guide on all the national parks here.
- Acadia
- American Samoa
- Arches
- Badlands
- Big Bend
- Biscayne
- Black Canyon of the Gunnison
- Bryce Canyon
- Canyonlands
- Capitol Reef
- Carlsbad Caverns
- Channel Islands
- Congaree
- Crater Lake
- Cuyahoga Valley
- Death Valley
- Denali
- Dry Tortugas
- Everglades
- Gates of the Arctic
- Glacier
- Glacier Bay
- Grand Canyon
- Grand Teton
- Great Basin
- Great Sand Dunes
- Great Smoky Mountains
- Guadalupe Mountains
- Haleakalā
- Hawaii Volcanoes
- Hot Springs
- Isle Royale
- Joshua Tree
- Katmai
- Kenai Fjords
- Kings Canyon
- Kobuk Valley
- Lake Clark
- Lassen Volcanic
- Mammoth Cave
- Mesa Verde
- Mount Rainier
- North Cascades
- Olympic
- Petrified Forest
- Pinnacles
- Redwood
- Rocky Mountain
- Saguaro
- Sequoia
- Shenandoah
- Theodore Roosevelt
- Virgin Islands
- Voyageurs
- Wind Cave
- Wrangell –St. Elias
- Yellowstone
- Yosemite
- Zion
If you are interested on complete professional information about the national parks you can find it here.