The U.S. National Park Service was established on August 25, 1916 and currently operates 63 National Parks. So far, I have visited 34 of them.*
- Acadia in Maine
- American Samoa in American Samoa
- Arches in Utah: visited in Summer 2000 and November 2018
- Badlands in South Dakota: visited in Summer 2000 and July 2007
- Big Bend in Texas
- Biscayne in Florida: visited between 1984–1986 and in February 2016
- Black Canyon of the Gunnison in Colorado
- Bryce Canyon in Utah: visited in Summer 2000
- Canyonlands in Utah: visited in November 2018
- Capitol Reef in Utah
- Carlsbad Caverns in New Mexico: visited in September 2022
- Channel Islands in California
- Congaree in South Carolina
- Crater Lake in Oregon: visited in July 2016
- Cuyahoga Valley in Ohio: visited in February 2011 and September 2014
- Death Valley in California and Nevada: visited in January 2016
- Denali in Alaska: visited in June 2017
- Dry Tortugas in Florida
- Everglades in Florida: visited many times between 1984–1986 and in February 2016
- Gates of the Arctic in Alaska
- Gateway Arch in Missouri: visited before it was designated as a National Park
- Glacier in Montana: visited in July 2014 and July 2019
- Glacier Bay in Alaska: visited in June 2017
- Grand Canyon in Arizona: visited in 2000
- Grand Teton in Wyoming: visited in August 2016
- Great Basin in Nevada
- Great Sand Dunes in Colorado
- Great Smoky Mountains in North Carolina and Tennessee: visited many times beginning in 1995, including October 2009, January 2015, September 2017, and October 2020
- Guadalupe Mountains in Texas: visited in September 2022
- Haleakalā in Hawaii: visited in April 2018 and June 2022
- Hawaii Volcanoes in Hawaii: visited in April 2018 and June 2022
- Hot Springs in Arkansas
- Indiana Dunes in Indiana: visited before it was designated as a National Park
- Isle Royale in Michigan
- Joshua Tree in California: visited in April 2015 and March 2018
- Katmai in Alaska
- Kenai Fjords in Alaska
- Kings Canyon in California
- Kobuk Valley in Alaska
- Lake Clark in Alaska
- Lassen Volcanic in California
- Mammoth Cave in Kentucky: visited ~2003–2004 and December 2017
- Mesa Verde in Colorado
- Mount Rainier in Washington: visited in September 2011
- New River Gorge in West Virginia
- North Cascades in Washington: visited in September 2011
- Olympic in Washington: visited in September 2011
- Petrified Forest in Arizona: visited in September 2013
- Pinnacles in California: visited in December 2015
- Redwood in California
- Rocky Mountain in Colorado: visited in August 2007, June 2012, October 2012, and September 2022
- Saguaro in Arizona: visited in September 2013
- Sequoia in California
- Shenandoah in Virginia
- Theodore Roosevelt in North Dakota
- Virgin Islands in United States Virgin Islands
- Voyageurs in Minnesota
- White Sands in New Mexico: visited in September 2022
- Wind Cave in South Dakota
- Wrangell–St. Elias in Alaska
- Yellowstone in Wyoming, Montana, and Idaho: visited in August 2016
- Yosemite in California: visited in August 2015 and December 2016
- Zion in Utah: visited in Summer 2000
*I visited Indiana Dunes and Gateway Arch multiple times each before they were designated as National Parks so I won’t count them until I visit again.