There are 58 natural national parks in the U.S

Only a few of them I have been. Crater Lake, Yosemite, Redwood, Sequoia

• Acadia: Maine

Area: 47389.6747,389.67 acres (191.8 km2)

• American Samoa: American Samoa

Area: 9,000.00 acres (36.4 km2)

• Arches: Utah

Area: 76,518.98 acres (309.7 km2)

• Badlands: South Dakota

Area: 242,755.94 acres (982.4 km2)

• Big Bend: Texas

Area: 801,163.21 acres (3,242.2 km2)

• Biscayne: Florida

Area: 172,924.07 acres (699.8 km2)

• Black Canyon of the Gunnison: Colorado

Area: 32,950.03 acres (133.3 km2)

• Bryce Canyon: Utah

Area: 35,835.08 acres (145.0 km2)

• Canyonlands: Utah

Area: 337,597.83 acres (1,366.2 km2)

• Capitol Reef: Utah

Area: 241,904.26 acres (979.0 km2)

• Carlsbad Caverns: New Mexico

Area: 46,766.45 acres (189.3 km2)

• Channel Islands: California

Area: 249,561.00 acres (1,009.9 km2)

• Congaree: South Carolina

Area: 26,545.86 acres (107.4 km2)

• Crater Lake: Oregon

Area: 183,224.05 acres (741.5 km2)

• Cuyahoga Valley: Ohio

Area: 32,860.73 acres (133.0 km2)

• Death Valley: California, Nevada

Area: 3,372,401.96 acres (13,647.6 km2)

• Denali: Alaska

Area: 4,740,911.72 acres (19,185.8 km2)

• Dry Tortugas: Florida

Area: 64,701.22 acres (261.8 km2)

• Everglades: Florida

Area: 1,508,537.90 acres (6,104.8 km2)

• Gates of the Arctic: Alaska

Area: 7,523,897.74 acres (30,448.1 km2)

• Glacier: Montana

Area: 1,013,572.41 acres (4,101.8 km2)

• Glacier Bay: Alaska

Area: 3,224,840.31 acres (13,050.5 km2)

• Grand Canyon: Arizona

Area: 1,217,403.32 acres (4,926.7 km2)

• Grand Teton: Wyoming

Area: 309,994.66 acres (1,254.5 km2)

• Great Basin: Nevada

Area: 77,180.00 acres (312.3 km2)

• Great Sand Dunes: Colorado

Area: 42,983.74 acres (173.9 km2)

• Great Smoky Mountains: North Carolina, Tennessee

Area: 521,490.13 acres (2,110.4 km2)

• Guadalupe Mountains: Texas

Area: 86,415.97 acres (349.7 km2)

• Haleakala: Hawaii

Area: 29,093.67 acres (117.7 km2)

• Hawaii Volcanoes: Hawaii

Area: 323,431.38 acres (1,308.9 km2)

• Hot Springs: Arkansas

Area: 5,549.75 acres (22.5 km2)

• Isle Royale: Michigan

Area: 571,790.11 acres (2,314.0 km2)

• Joshua Tree: California

Area: 789,745.47 acres (3,196.0 km2)

• Katmai: Alaska

Area: 669,982.99 acres (2,711.3 km2)

• Kenai Fjords: Alaska

Area: 669,982.99 acres (2,711.3 km2)

• Kings Canyon: California

Area: 461,901.20 acres (1,869.2 km2)

• Kobuk Valley: Alaska

Area: 1,750,716.50 acres (7,084.9 km2)

• Lake Clark: Alaska

Area: 212,619,733.21 acres (10,601.7 km2)

• Lassen Volcanic: California

Area: 106,372.36 acres (430.5 km2)

• Mammoth Cave: Kentucky

Area: 52,830.19 acres (213.8 km2)

• Mesa Verde: Colorado

Area: 52,121.93 acres (210.9 km2)

• Mount Rainier: Washington

Area: 235,625.00 acres (953.5 km2)

• North Cascades: Washington

Area: 504,780.94 acres (2,042.8 km2)

• Olympic: Washington

Area: 922,650.86 acres (3,733.8 km2)

• Petrified Forest: Arizona

Area: 93,532.57 acres (378.5 km2)

• Redwood: California

Area: 112,512.05 acres (455.3 km2)

• Rocky Mountain: Colorado

Area: 265,828.41 acres (1,075.8 km2)

• Saguaro: Arizona

Area: 91,439.71 acres (370.0 km2)

• Sequoia: California

Area: 404,051.17 acres (1,635.1 km2)

• Shenandoah: Virginia

Area: 199,045.23 acres (805.5 km2)

• Theodore Roosevelt: North Dakota

Area: 70,446.89 acres (285.1 km2)

• Virgin Islands: United States Virgin Islands

Area: 14,688.87 acres (59.4 km2)

• Voyageurs: Minnesota

Area: 218,200.17 acres (883.0 km2)

• Wind Cave: South Dakota

Area: 28,295.03 acres (114.5 km2)

• Wrangell – St. Elias: Alaska

Area: 8,323,147.59 acres (33,682.6 km2)

• Yellowstone: Wyoming, Montana, Idaho

Area: 2,219,790.71 acres (8,983.2 km2)

• Yosemite: California

Area: 761,266.19 acres (3,080.7 km2)

• Zion: Utah

Area: 146,597.60 acres (593.3 km2)

National Parks in US