1.  Great Smoky Mountains National Park, Tennessee and North Carolina  (11.5 million visitors)

2.  Zion National Park, Utah  (4.9 million)

3.  Yellowstone National Park, Wyoming  (4.7 million)

4.  Grand Canyon National Park, Arizona  (4.4 million)

5.  Yosemite National Park, California  (4.2 million)

6.  Rocky Mountain National Park  (4.1 million)

7.  Acadia National Park, Maine  (4 million)

8.  Grand Teton National Park, Wyoming  (3.8 million)

9.  Olympic National Park, Washington  (3.5 million)

10.  Glacier National Park, Montana  (3.1 million)

4.1 million visitors passed through the gates at Rocky Mountain National Park in 2025, a small increase from the prior year, according to new National Park Service tallies...