| 1 | Gates of the Arctic National Park | 10,939 | Apr, May, Sep |
| 2 | Kobuk Valley National Park | 14,221 | May, Jun, Aug |
| 3 | National Park of American Samoa | 17,668 | Jun, Aug, Dec |
| 4 | Lake Clark National Park | 18,295 | Apr, May, Jun |
| 5 | Isle Royale National Park | 27,632 | May, Sep, Oct |
| 6 | North Cascades National Park | 30,353 | May, Jun, Oct |
| 7 | Katmai National Park | 32,629 | May, Jun, Oct |
| 8 | Wrangell–St. Elias National Park | 76,849 | Apr, May, Sep |
| 9 | Dry Tortugas National Park | 84,162 | Jan, Feb, Nov |
| 10 | Great Basin National Park | 148,707 | Mar, Apr, May |
| 11 | Voyageurs National Park | 218,131 | Apr, May, Oct |
| 12 | Guadalupe Mountains National Park | 224,635 | May, Aug, Sep |
| 13 | Congaree National Park | 239,941 | Jan, Feb, Apr |
| 14 | Channel Islands National Park | 292,203 | Jan, Mar, May |
| 15 | Black Canyon of the Gunnison National Park | 309,836 | Mar, Apr, May |
| 16 | Pinnacles National Park | 332,477 | May, Oct, Nov |
| 17 | Virgin Islands National Park | 351,708 | Aug, Sep, Oct |
| 18 | Carlsbad Caverns National Park | 401,110 | Jan, Feb, Oct |
| 19 | Kenai Fjords National Park | 406,818 | Apr, May, Jun |
| 20 | Lassen Volcanic National Park | 417,467 | Aug, Sep, Oct |
| 21 | Denali National Park | 433,068 | May, Jun, Sep |
| 22 | Great Sand Dunes National Park | 495,685 | Mar, Apr, Oct |
| 23 | Petrified Forest National Park | 498,248 | Feb, Apr, Nov |
| 24 | Mesa Verde National Park | 499,330 | Mar, Apr, May |
| 25 | Big Bend National Park | 546,805 | Jun, Aug, Sep |
| 26 | Glacier Bay National Park | 563,103 | Apr, May, Jun |
| 27 | Crater Lake National Park | 574,435 | May, Jun, Sep |
| 28 | Biscayne National Park | 595,339 | Jan, Feb, Dec |
| 29 | Wind Cave National Park | 600,907 | Mar, Apr, Oct |
| 30 | Redwood National Park | 625,750 | Apr, May, Aug |
| 31 | Mammoth Cave National Park | 648,231 | Jan, Feb, Nov |
| 32 | Kings Canyon National Park | 665,230 | Apr, May, Oct |
| 33 | White Sands National Park | 715,734 | Feb, Oct, Nov |
| 34 | Theodore Roosevelt National Park | 734,893 | Apr, May, Oct |
| 35 | Canyonlands National Park | 821,124 | Feb, Mar, Nov |
| 36 | Haleakalā National Park | 863,655 | Apr, Aug, Sep |
| 37 | Everglades National Park | 885,539 | Oct, Nov, Dec |
| 38 | Saguaro National Park | 958,601 | May, Sep, Oct |
| 39 | Badlands National Park | 1,102,207 | Apr, May, Oct |
| 40 | Sequoia National Park | 1,176,246 | May, Jun, Oct |
| 41 | Death Valley National Park | 1,227,132 | Jan, Feb, Nov |
| 42 | Capitol Reef National Park | 1,342,558 | Feb, Mar, Apr |
| 43 | Arches National Park | 1,545,566 | Feb, Mar, Nov |
| 44 | Hawaiʻi Volcanoes National Park | 1,555,088 | Apr |
| 45 | Shenandoah National Park | 1,603,996 | Feb, Mar, Apr |
| 46 | Mount Rainier National Park | 1,644,420 | May, Jun, Sep |
| 47 | New River Gorge National Park | 1,750,770 | Mar, Apr, Nov |
| 48 | Gateway Arch National Park | 1,991,753 | Apr, Sep, Oct |
| 49 | Bryce Canyon National Park | 2,277,195 | Mar, Apr, Aug |
| 50 | Hot Springs National Park | 2,453,681 | Jan, Sep, Oct |
| 51 | Indiana Dunes National Park | 2,822,397 | Mar, Apr, May |
| 52 | Cuyahoga Valley National Park | 2,857,286 | Apr, May, Jun |
| 53 | Glacier National Park | 3,053,809 | Jun, Sep, Oct |
| 54 | Joshua Tree National Park | 3,063,524 | Jan, May, Oct |
| 55 | Olympic National Park | 3,080,172 | Apr, May, Jun |
| 56 | Grand Teton National Park | 3,507,486 | Apr, May, Oct |
| 57 | Yosemite National Park | 3,850,488 | Mar, Apr, May |
| 58 | Acadia National Park | 3,992,045 | Mar, Apr, May |
| 59 | Rocky Mountain National Park | 4,235,378 | Mar, Apr, May |
| 60 | Yellowstone National Park | 4,431,842 | Apr, May, Jun |
| 61 | Grand Canyon National Park | 4,669,660 | Feb, Apr, Jun |
| 62 | Zion National Park | 4,857,322 | Jan, Feb, Nov |
| 63 | Great Smoky Mountains National Park | 12,823,319 | Apr, May, Aug |