| Nom du Parc | Etat/Ville | Type du Parc |
|---|---|---|
| A. W. Marion State Park | Ohio (Circleville) | State Park |
| A.H. Stephens State Park | Georgie (Crawfordville) | State Park |
| Abilene State Park | Texas (Tuscola) | State Park |
| Above All State Park | Connecticut (Warren) | State Park |
| Abraham Lincoln Birthplace National Historic Site | Kentucky (Warren) | National Historic Site |
| Acadia National Park | Maine (Bar Harbor) | National Park |
| Ackley Lake State Park | Montana (Great Falls) | State Park |
| Adams Lake State Park | Ohio (West Union) | State Park |
| Adams National Historical Park | Massachusetts (Quincy) | National Historical Park |
| Addison Blockhouse Historic State Park | Floride (Ormond Beach) | State Park |
| Adeline Jay Geo-Karis Illinois Beach State Park | Illinois ( Zion) | State Park |
| Afognak Island State Park | Alaska (Aleneva) | State Park |
| African Burial Ground National Monument | New York (New York) | National Monument |
| Afton State Park | Minnesota (Hastings) | State Park |
| Agate Fossil Beds National Monument | Nebraska (Harrison) | National Monument |
| Ahern State Park | New Hampshire (Laconia) | State Park |
| Ahjumawi Lava Springs State Park | Californie (McArthur) | State Park |
| Ahupuaʻa ʻO Kahana State Park | Hawaii (Oahu, Kaaawa) | State Park |
| Aiken State Park | Caroline du Sud (Windsor) | State Park |
| Ainsworth State Park | Oregon (Near Portland) | State Park |
| Akaka Falls State Park | Hawaii (Honomu) | State Park |
| Ala Kahakai National Historic Trail | Hawaii (Honomu) | National Historic Trail |
| Alabaster Caverns State Park | Oklahoma (Freedom) | State Park |
| Alafia River State Park | Floride (Lithia) | State Park |
| Alagnak Wild River | Alaska (King Salmon) | Wild River |
| Alamo Lake State Park | Arizona (Congress) | State Park |
| Alapocas Run State Park | Delaware (Wilmington) | State Park |
| Alburg Dunes State Park | Vermont (Alburgh) | State Park |
| Alcatraz Island | Californie (San Francisco) | |
| Aleutian World War II National Historic Area | Alaska (Unalaska/Dutch Harbor) | National Historic Area |
| Alfred A. Loeb State Park | Oregon (Brookings) | State Park |
| Alfred B. Maclay Gardens State Park | Floride (Tallahassee) | State Park |
| Algonac State Park | Michigan (Marine City) | State Park |
| Alibates Flint Quarries National Monument | Texas (Fritch) | National Monument |
| Allaire State Park | New Jersey (Farmingdale) | State Park |
| Allamuchy Mountain State Park | New Jersey (Stanhope) | State Park |
| Allegany State Park | New York (Salamanca) | State Park |
| Allegheny Islands State Park | Pennsylvanie (Pittsburgh) | State Park |
| Allegheny Portage Railroad National Historic Site | Pennsylvanie (Gallitzin) | National Historic Site |
| Allen David Broussard Catfish Creek Preserve State Park | Floride (Haines City) | State Park |
| Allis State Park | Vermont (Randolph) | State Park |
| Aloha State Park | Michigan (Cheboygan) | State Park |
| Alta Lake State Park | Washington (Pateros) | State Park |
| Alum Creek State Park | Ohio (Delaware) | State Park |
| Ambrose A. Call State Park | Iowa (Algona) | State Park |
| Amelia Island State Park | Floride (Jacksonville) | State Park |
| Ames Nowell State Park | Massachusetts (Abington) | State Park |
| Amherst State Park | New York (Salamanca) | State Park |
| Amicalola Falls State Park & Lodge | Georgie (Amicalola) | State Park |
| Amistad National Recreation Area | Texas (Del Rio) | National Recreation Area |
| Amnicon Falls State Park | Wisconsin (Amnicon Falls) | State Park |
| Anaconda Smelter Stack State Park | Montana (Whitehall) | State Park |
| Anacostia Park | Columbia (district) (Washington) | Park |
| Anasazi State Park Museum | Utah (Boulder) | State Park |
| Anastasia State Park | Floride (St. Augustine) | State Park |
| Anclote Key Preserve State Park | Floride (Tarpon Springs) | State Park |
| Anderson Lake State Park | Washington (Chimacum) | State Park |
| Andersonville National Historic Site | Georgie (Andersonville) | National Historic Site |
| Andrew Jackson State Park | Caroline du Sud (Lancaster) | State Park |
| Andrew Johnson National Historic Site | Tennessee (Greeneville) | National Historic Site |
| Andrew Molera State Park | Californie (Big Sur) | State Park |
| Angel Island State Park | Californie (Angel Island) | State Park |
| Aniakchak National Monument & Preserve | Alaska (King Salmon) | National Monument & Preserve |
| Año Nuevo State Park | Californie (Davenport) | State Park |
| Antelope Canyon Navajo Tribal Park | Arizona (Page) | Navajo Tribal Park |
| Antelope Island State Park | Utah (Salt Lake City) | State Park |
| Antietam National Battlefield | Maryland (Sharpsburg) | National Battlefield |
| Antietam National Cemetery | Maryland (Sharpsburg) | National Cemetery |
| Anza-Borrego Desert State Park | Californie (Ocotillo Wells) | State Park |
| Apostle Islands National Lakeshore | Wisconsin (Lake Superior) | National Lakeshore |
| Appalachian National Scenic Trail | Maine (Maine to Georgia) | National Scenic Trail |
| Apple River Canyon State Park | Illinois (Apple River) | State Park |
| Appomattox Court House National Historical Park | Virginie (Appomattox) | National Historical Park |
| Archbald Pothole State Park | Pennsylvanie (Archbald) | State Park |
| Arches National Park | Utah (Moab) | National Park |
| Argyle Lake State Park | Illinois (Colchester) | State Park |
| Arkansas Post National Memorial | Arkansas (Gillett) | National Memorial |
| Arlington House, The Robert E. Lee Memorial | Virginie (Arlington) | |
| Aroostook State Park | Maine (Westfield) | State Park |
| Arrowhead State Park | Oklahoma (Canadian) | State Park |
| Arthur B. Ripley Desert Woodland State Park | Californie (Lancaster) | State Park |
| Artpark State Park | New York (Lewiston) | State Park |
| Ashland State Park | Massachusetts (Ashland) | State Park |
| Assateague Island National Seashore | Maryland (Du Maryland à Washington) | National Seashore |
| Assateague State Park | Maryland (Berlin) | State Park |
| Atlanta State Park | Texas (Atlanta) | State Park |
| Auburn Valley State Park | Delaware (Yorklyn) | State Park |
| Audra State Park | Virginie-Occidentale (Buckhannon) | State Park |
| Avalon State Park | Floride (North Hutchinson) | State Park |
| Aztalan State Park | Wisconsin (Aztalan) | State Park |
| Aztec Ruins National Monument | Nouveau Mexique (Aztec) | National Monument |
