Haleakala National Park
Hawaii Volcanoes National Park
Hot Springs National Park
Indiana Dunes National Park
Isle Royale National Park
Joshua Tree National Park
Katmai National Park and Preserve
Kenai Fjords National Park
Kings Canyon National Park
Kobuk Valley National Park and Preserve

Other Park Units H–K

Harpers Ferry National Historical Park
Hovenweep National Monument
Jean Lafitte National Historical Park and Preserve
Jewel Cave National Monument
John Day Fossil Beds National Monument
Kennesaw Mountain National Battlefield Park