Units of the National Park System
(about this list)

Abraham Lincoln Birthplace National Historic Site
Acadia National Park
Adams National Historical Park
Agate Fossil Beds National Monument
Alagnak Wild River
Alibates Flint Quarries National Monument
Allegheny Portage Railroad National Historic Site
Amistad National Recreation Area
Andersonville National Historic Site
Andrew Johnson National Historic Site
Aniakchak National Monument & Preserve
Antietam National Battlefield
Apostle Islands National Lakeshore
Appalachian National Scenic Trail
Appomattox Court House National Historical Park
Arches National Park
Arkansas Post National Memorial
Arlington House / The Robert E. Lee Memorial
Assateague Island National Seashore
Aztec Ruins National Monument
Badlands National Park
Bandelier National Monument
Bent's Old Fort National Historic Site
Bering Land Bridge National Preserve
Big Bend National Park
Big Cypress National Preserve
Big Hole National Battlefield
Big South Fork National River & Recreation Area
Big Thicket National Preserve
Bighorn Canyon National Recreation Area
Biscayne National Park
Black Canyon Of The Gunnison National Park
Blue Ridge Parkway
Bluestone National Scenic River
Booker T. Washington National Monument
Boston African American National Historic Site
Boston Harbor Islands National Recreation Area
Boston National Historical Park
Brices Cross Roads National Battlefield Site
Brown v. Board of Education National Historic Site
Bryce Canyon National Park
Buck Island Reef National Monument
Buffalo National River
Cabrillo National Monument
Canaveral National Seashore
Cane River Creole National Historical Park
Canyon De Chelly National Monument
Canyonlands National Park
Cape Cod National Seashore
Cape Hatteras National Seashore
Cape Krusenstern National Monument
Cape Lookout National Seashore
Capitol Reef National Park
Capulin Volcano National Monument
Carl Sandburg Home National Historic Site
Carlsbad Caverns National Park
Casa Grande Ruins National Monument
Castillo De San Marcos National Monument
Castle Clinton National Monument
Catoctin Mountain Park
Cedar Breaks National Monument
Cedar Creek & Belle Grove National Historical Park
Central High School National Historic Site
Chaco Culture National Historical Park
Chamizal National Memorial
Channel Islands National Park
Charles Pinckney National Historic Site
Chattahoochee River National Recreation Area
Chesapeake & Ohio Canal National Historical Park
Chickamauga & Chattanooga National Military Park
Chickasaw National Recreation Area
Chiricahua National Monument
Christiansted National Historic Site
City Of Rocks National Reserve
Clara Barton National Historic Site
Colonial National Historical Park
Colorado National Monument
Congaree Swamp National Monument
Constitution Gardens
Coronado National Memorial
Cowpens National Battlefield
Crater Lake National Park
Craters Of The Moon National Monument & Preserve
Cumberland Gap National Historical Park
Cumberland Island National Seashore
Curecanti National Recreation Area
Cuyahoga Valley National Park
Dayton Aviation Heritage National Historical Park
De Soto National Memorial
Death Valley National Park
Delaware National Scenic River
Delaware Water Gap National Recreation Area
Denali National Park & Preserve
Devils Postpile National Monument
Devils Tower National Monument
Dinosaur National Monument
Dry Tortugas National Park
Ebey's Landing National Historical Reserve
Edgar Allan Poe National Historic Site
Edison National Historic Site
Effigy Mounds National Monument
Eisenhower National Historic Site
El Malpais National Monument
El Morro National Monument
Eleanor Roosevelt National Historic Site
Eugene O'Neill National Historic Site
Everglades National Park
Federal Hall National Memorial
Fire Island National Seashore
First Ladies National Historic Site
Flight 93 National Memorial
Florissant Fossil Beds National Monument
Ford's Theatre National Historic Site
Fort Bowie National Historic Site
Fort Caroline National Memorial
Fort Clatsop National Memorial
Fort Davis National Historic Site
Fort Donelson National Battlefield
Fort Frederica National Monument
Fort Laramie National Historic Site
Fort Larned National Historic Site
Fort Matanzas National Monument
Fort McHenry National Monument and Historic Shrine
Fort Necessity National Battlefield
Fort Point National Historic Site
Fort Pulaski National Monument
Fort Raleigh National Historic Site
Fort Scott National Historic Site
Fort Smith National Historic Site
Fort Stanwix National Monument
Fort Sumter National Monument
Fort Union National Monument
Fort Union Trading Post National Historic Site
Fort Vancouver National Historic Site
Fort Washington Park
Fossil Butte National Monument
Franklin Delano Roosevelt Memorial
Frederick Douglass National Historic Site
Frederick Law Olmsted National Historic Site
Fredericksburg & Spotsylvania National Military Park
Friendship Hill National Historic Site
Gates Of The Arctic National Park & Preserve
Gateway National Recreation Area
Gauley River National Recreation Area
General Grant National Memorial
George Rogers Clark National Historical Park
George Washington Birthplace National Monument
George Washington Carver National Monument
George Washington Memorial Parkway
Gettysburg National Military Park
Gila Cliff Dwellings National Monument
Glacier Bay National Park & Preserve
Glacier National Park
Glen Canyon National Recreation Area
Golden Gate National Recreation Area
Golden Spike National Historic Site
Governors Island National Monument
Grand Canyon National Park
Grand Portage National Monument
Grand Teton National Park
Grant-Kohrs Ranch National Historic Site
Great Basin National Park
Great Egg Harbor Scenic and Recreational River
Great Sand Dunes National Park & Preserve
Great Smoky Mountains National Park
Greenbelt Park
Guadalupe Mountains National Park
Guilford Courthouse National Military Park
Gulf Islands National Seashore
Hagerman Fossil Beds National Monument
Haleakala National Park
Hamilton Grange National Memorial
Hampton National Historic Site
Harpers Ferry National Historical Park
Harry S Truman National Historic Site
Hawaii Volcanoes National Park
Herbert Hoover National Historic Site
Hohokam Pima National Monument
Home Of Franklin D Roosevelt National Historic Site
Homestead National Monument of America
Hopewell Culture National Historical Park
Hopewell Furnace National Historic Site
Horseshoe Bend National Military Park
Hot Springs National Park
Hovenweep National Monument
Hubbell Trading Post National Historic Site
Independence National Historical Park
Indiana Dunes National Lakeshore
Isle Royale National Park
James A Garfield National Historic Site
Jean Lafitte National Historic Park & Preserve
Jefferson National Expansion Memorial
Jewel Cave National Monument
Jimmy Carter National Historic Site
John D. Rockefeller, Jr. Memorial Parkway
John Day Fossil Beds National Monument
John F Kennedy National Historic Site
John Muir National Historic Site
Johnstown Flood National Memorial
Joshua Tree National Park
Kalaupapa National Historical Park
Kaloko-Honokohau National Historical Park
Katmai National Park & Preserve
Kenai Fjords National Park
Kennesaw Mountain National Battlefield Park
Keweenaw National Historical Park
Kings Canyon National Park
Kings Mountain National Military Park
Klondike Gold Rush National Historical Park
Knife River Indian Villages National Historic Site
Kobuk Valley National Park
Korean War Veterans Memorial
Lake Chelan National Recreation Area
Lake Clark National Park & Preserve
Lake Mead National Recreation Area
Lake Meredith National Recreation Area
Lake Roosevelt National Recreation Area
Lassen Volcanic National Park
Lava Beds National Monument
Lincoln Boyhood National Memorial
Lincoln Home National Historic Site
Lincoln Memorial
Little Bighorn Battlefield National Monument
Little River Canyon National Preserve
Longfellow National Historic Site
Lowell National Historical Park
Lyndon B. Johnson National Historical Park
Lyndon Baines Johnson Memorial Grove on the Potomac
Maggie L Walker National Historic Site
Mammoth Cave National Park
Manassas National Battlefield Park
Manzanar National Historic Site
Marsh - Billings - Rockefeller National Historical Park
Martin Luther King, Jr. National Historic Site
Martin Van Buren National Historic Site
Mary Mcleod Bethune Council House National Historic Site
Mesa Verde National Park
Minidoka Internment National Monument
Minute Man National Historical Park
Minuteman Missile National Historic Site
Mississippi National River & Recreation Area
Missouri National Recreational River
Mojave National Preserve
Monocacy National Battlefield
Montezuma Castle National Monument
Moores Creek National Battlefield
Morristown National Historical Park
Mount Rainier National Park
Mount Rushmore National Memorial
Muir Woods National Monument
Natchez National Historical Park
Natchez Trace National Scenic Trail
Natchez Trace Parkway
National Capital Parks
National Mall
National Park of American Samoa
Natural Bridges National Monument
Navajo National Monument
New Bedford Whaling National Historical Park
New Orleans Jazz National Historical Park
New River Gorge National River
Nez Perce National Historical Park
Nicodemus National Historic Site
Ninety Six National Historic Site
Niobrara National Scenic River
Noatak National Preserve
North Cascades National Park
Obed Wild & Scenic River
Ocmulgee National Monument
Oklahoma City National Memorial
Olympic National Park
Oregon Caves National Monument
Organ Pipe Cactus National Monument
Ozark National Scenic Riverways
Padre Island National Seashore
Palo Alto Battlefield National Historic Site
Pea Ridge National Military Park
Pecos National Historical Park
Pennsylvania Avenue National Historic Site
Perry's Victory & International Peace Memorial
Petersburg National Battlefield
Petrified Forest National Park
Petroglyph National Monument
Pictured Rocks National Lakeshore
Pinnacles National Monument
Pipe Spring National Monument
Pipestone National Monument
Piscataway Park
Point Reyes National Seashore
Potomac Heritage National Scenic Trail
Poverty Point National Monument
Prince William Forest Park
Pu`uhonua O Honaunau National Historical Park
Puukohola Heiau National Historic Site
Rainbow Bridge National Monument
Redwood National and State Parks
Richmond National Battlefield Park
Rio Grande Wild & Scenic River
Rock Creek Park
Rocky Mountain National Park
Roger Williams National Memorial
Rosie The Riveter / World War II Home Front National Historical Park
Ross Lake National Recreation Area
Russell Cave National Monument
Sagamore Hill National Historic Site
Saguaro National Park
Saint Croix Island International Historic Site
Saint Paul's Church National Historic Site
Saint-Gaudens National Historic Site
Salem Maritime National Historic Site
Salinas Pueblo Missions National Monument
Salt River Bay National Historic Park and Ecological Preserve
San Antonio Missions National Historical Park
San Francisco Maritime National Historical Park
San Juan Island National Historical Park
San Juan National Historic Site
Santa Monica Mountains National Recreation Area
Saratoga National Historical Park
Saugus Iron Works National Historic Site
Scotts Bluff National Monument
Sequoia National Park
Shenandoah National Park
Shiloh National Military Park
Sitka National Historical Park
Sleeping Bear Dunes National Lakeshore
Springfield Armory National Historic Site
St. Croix National Scenic River
Statue Of Liberty National Monument
Steamtown National Historic Site
Stones River National Battlefield
Sunset Crater Volcano National Monument
Tallgrass Prairie National Preserve
Thaddeus Kosciuszko National Memorial
Theodore Roosevelt Birthplace National Historic Site
Theodore Roosevelt Inaugural National Historic Site
Theodore Roosevelt Island Park
Theodore Roosevelt National Park
Thomas Jefferson Memorial
Thomas Stone National Historic Site
Timpanogos Cave National Monument
Timucuan Ecological & Historic Preserve
Tonto National Monument
Tumac‡cori National Historical Park
Tupelo National Battlefield
Tuskegee Airman National Historic Site
Tuskegee Institute National Historic Site
Tuzigoot National Monument
U.S. Virgin Islands Coral Reef National Monument
Ulysses S. Grant National Historic Site
Upper Delaware Scenic & Recreational River
USS Arizona Memorial
Valley Forge National Historical Park
Vanderbilt Mansion National Historic Site
Vicksburg National Military Park
Vietnam Veterans Memorial
Virgin Islands National Park
Voyageurs National Park
Walnut Canyon National Monument
War In The Pacific National Historical Park
Washington Monument
Washita Battlefield National Historic Site
Weir Farm National Historic Site
Whiskeytown National Recreation Area
White House, President's Park
White Sands National Monument
Whitman Mission National Historic Site
William Howard Taft National Historic Site
Wilson's Creek National Battlefield
Wind Cave National Park
Wolf Trap Farm Park for the Performing Arts
Women's Rights National Historical Park
Wrangell - St. Elias National Park & Preserve
Wright Brothers National Memorial
Wupatki National Monument
Yellowstone National Park
Yosemite National Park
Yucca House National Monument
Yukon - Charley Rivers National Preserve
Zion National Park

ABOUT THIS LIST:
This is my master list of all 388 Official Units of the National Park System. Click on a link to see what the stamps look like and find out where they are kept.  If you count this list very carefully you will notice only 379 entries, not 384.  That is due to the fact that nine units count as two, mainly the "Park and Preserves".  The sites that count as two are: Aniakchak National Monument & Preserve, Craters Of The Moon National Monument & Preserve, Denali National Park & Preserve, Gates Of The Arctic National Park & Preserve, Glacier Bay National Park & Preserve, Great Sand Dunes National Park & Preserve, Katmai National Park & Preserve, Lake Clark National Park & Preserve, and Wrangell - St. Elias National Park & Preserve.  This list is only for the official NPS sites.  Affiliated Areas and National Trails are listed separately.  If you think I left something off send an e-mail to stamps@danielcohen.org.