List of U.S. National Parks
| Site Name |
|---|
| Abraham Lincoln Birthplace National Historic Site |
| Abraham Lincoln National Heritage Area |
| Acadia National Park |
| Adams National Historical Park |
| African Burial Ground National Monument |
| Agate Fossil Beds National Monument |
| Ala Kahakai National Historic Trail |
| Alagnak Wild River |
| Alatna Wild River |
| Aleutian World War II National Historic Area |