Established: May 11, 1910 Location: Montana Area: 1,013,572 acres Visitation (2017): 3,305,512 Visitation Increase Since 2000: 91.2% National Park Service Official Website
Established: February 26, 1919 Location: Arizona Area: 1,217,403 acres Visitation (2017): 6,254,238 Visitation Increase Since 2000: 40.2% National Park Service Official Website
