Last updated: March 29, 2025
Article
Historic Listing of NPS Park, Program, and Office Codes
This guide provides a current and historic listing of National Park Service (NPS) three- or four-letter codes used to represent parks, programs, and regional offices. It is intended to be used together with NPS History Collection finding aids for collections which include these codes, although it may be useful for other purposes. Parks are listed by their current official names, designations, and codes. Legacy codes for parks that have had name changes, code changes for other reasons, and codes for parks, organizations, or programs that no longer exist are also included.
When conducting research in our finding aids, researchers may need to search for several codes to ensure they are finding all relevant documentation.To search this guide for a specific park, program, offices, or codes enter Ctrl + F on your keyboard (command key + F key on a Mac).
Using This Guide
This list is compiled from materials in the NPS History Collection. It began as a list to facilitate consistency in arrangement and folder names during processing of archival collections. While extensive, it may not be complete. Staff endeavors to keep it current as new units are added to the NPS or as additional legacy programs with codes are identified in the archives. In cases where official codes didn't exist, users are directed toward regional or other codes where relevant materials will be found. Please direct any questions to the archivist.When conducting research in our finding aids, researchers may need to search for several codes to ensure they are finding all relevant documentation.To search this guide for a specific park, program, offices, or codes enter Ctrl + F on your keyboard (command key + F key on a Mac).
| Park, Program, or Office Name | Alpha Code |
| Abraham Lincoln Birthplace National Historical Park | ABLI |
| Abraham Lincoln National Heritage Area | See MWR |
| Acadia National Park | ACAD |
| Adams Memorial, District of Columbia | See NCR |
| Adams National Historical Park | ADAM |
| African American Civil War Memorial | AFAM |
| African Burial Ground National Monument | AFBG |
| Agate Fossil Beds National Monument | AGFO |
| Ala Kahakai National Historic Trail | ALKA |
| Alagnak Wild River | ALAG |
| Alaska Public Lands | ANCH |
| Alaska Region | AKR |
| Alaska Regional Office | AKRO |
| Alcatraz Island | ALCA |
| Aleutian World War II National Historic Area | ALEU |
| Alibates Flint Quarries National Monument | ALFL |
| Allegheny Portage Railroad National Historic Site | ALPO |
| Amache National Historic Site | AMCH |
| American Memorial Park | AMME |
| Amistad National Recreation Area | AMIS |
| Anacostia Park | ANAC |
| Andersonville National Historic Site | ANDE |
| Andrew Johnson National Historic Site | ANJO |
| Aniakchak National Monument and Preserve | ANIA |
| Aniakchak Wild River | See ANIA |
| Antietam National Battlefield | ANTI |
| Apostle Islands National Lakeshore | APIS |
| Appalachian Highlands Network | APHN |
| Appalachian National Scenic Trail | APPA |
| Appomattox Court House National Historical Park | APCO |
| Arabia Mountain National Heritage Area | ARMO |
| Arches National Park | ARCH |
| Arctic Network | ARCN |
| Arkansas Post National Memorial | ARPO |
| Arlington House, The Robert E. Lee Memorial | ARHO |
| Assateague Island National Seashore | ASIS |
| Atchafalaya National Heritage Area | ATTR |
| Augusta Canal National Heritage Area | AUCA |
| Aztec Ruins National Monument | AZRU |
| Badlands National Park | BADL |
| Baltimore National Heritage Area | BALT |
| Baltimore-Washington Parkway | BAWA |
| Bandelier National Monument | BAND |
| Belmont-Paul Women's Equality National Monument (Sewall-Belmont Women's Equality NM) | BEPA |
| Bent's Old Fort National Historic Site | BEOL |
| Bering Land Bridge National Preserve | BELA |
| Big Bend National Park | BIBE |
| Big Cypress National Preserve | BICY |
| Big Hole National Battlefield | BIHO |
| Big South Fork National River and Recreation Area | BISO |
| Big Thicket National Preserve | BITH |
| Bighorn Canyon National Recreation Area | BICA |
| Birmingham Civil Rights National Monument | BICR |
| Biscayne National Park | BISC |
| Black Canyon Of The Gunnison National Park | BLCA |
| Blackstone River Valley National Historical Park | BLRV |
| Blackwell School National Historic Site | BLSC |
| Blue Ridge National Heritage Area | BLRN |
| Blue Ridge Parkway | BLRI |
| Bluestone National Scenic River | BLUE |
| Booker T. Washington National Monument | BOWA |
| Boston African American National Historic Site | BOAF |
| Boston Harbor Islands National Recreation Area | BOHA |
| Boston National Historical Park | BOST |
| Brices Cross Roads National Battlefield Site | BRCR |
| Brown v. Board Of Education National Historic Site | BRVB |
| Bryce Canyon National Park | BRCA |
| Buck Island Reef National Monument | BUIS |
| Buffalo National River | BUFF |
| Cabrillo National Monument | CABR |
| Cache la Poudre River National Heritage Area | CALA |
| California National Historic Trail | CALI |
| Camp Nelson National Monument | CANE |
| Canaveral National Seashore | CANA |
| Cane River Creole National Historical Park | CARI |
| Cane River National Heritage Area | CRHA |
| Canyon de Chelly National Monument | CACH |
| Canyonlands National Park | CANY |
| Cape Cod National Seashore | CACO |
| Cape Hatteras National Seashore | CAHA |
| Cape Henry Memorial, Part of Colonial National Historical Park | CAHA |
| Cape Krusenstern National Monument | CAKR |
| Cape Lookout National Seashore | CALO |
| Capitol Hill Parks | CAHI |
| Capitol Reef National Park | CARE |
| Captain John Smith Chesapeake National Historic Trail | CAJO |
| Capulin Volcano National Monument | CAVO |
| Carl Sandburg Home National Historic Site | CARL |
| Carlsbad Caverns National Park | CAVE (formerly CACA) |
| Carter G. Woodson Home National Historic Site | CAWO |
| Casa Grande Ruins National Monument | CAGR |
| Castillo de San Marcos National Monument | CASA |
| Castle Clinton National Monument | CACL |
| Castle Mountains National Monument | CAMO |
| Catoctin Mountain Park | CATO |
| Cedar Breaks National Monument | CEBR |
| Cedar Creek and Belle Grove National Historical Park | CEBE |
| Central Alaska Network | CAKN |
| César E. Chávez National Monument | CECH |
| Chaco Culture National Historical Park | CHCU |
| Chamizal National Memorial | CHAM |
| Champlain Valley National Heritage Partnership | CHVA |
| Channel Islands National Park | CHIS |
| Charles Pinckney National Historic Site | CHPI |
| Charles Young Buffalo Soldiers National Monument | CHYO |
| Chattahoochee River National Recreation Area | CHAT |
| Chesapeake and Ohio Canal National Historical Park | CHOH |
| Chesapeake Bay Gateways | CHBA |
| Chickamauga and Chattanooga National Military Park | CHCH |
| Chickasaw National Recreation Area (formerly Platt National Park) | CHIC |
| Chihuahuan Desert Network | CHDN |
| Chimney Rock National Historic Site | use MWR |
| Chiricahua National Monument | CHIR |
| Christiansted National Historic Site | CHRI |
| City Of Rocks National Reserve | CIRO |
| City Of Rocks National Reserve | CWDW |
| Clara Barton National Historic Site | CLBA |
| Claude Moore Colonial Farm | CLMO |
| Colonial National Historical Park | COLO |
| Colorado National Monument | COLM |
| Coltsville National Historical Park | COLT |
| Congaree National Park | CONG |
| Constitution Gardens | COGA |
| Coronado National Memorial | CORO |
| Cowpens National Battlefield | COWP |
| Crater Lake National Park | CRLA |
| Craters Of The Moon National Monument and Preserve | CRMO |
| Cumberland Gap National Historical Park | CUGA |
| Cumberland Island National Seashore | CUIS |
| Cumberland Piedmont Network | CUPN |
| Curecanti National Recreation Area | CURE |
| Cuyahoga Valley National Park | CUVA |
| David Berger National Memorial | DABE |
| Dayton Aviation Heritage National Historical Park | DAAV |
| De Soto National Memorial | DESO |
| Death Valley National Park | DEVA |
| Delaware and Lehigh National Heritage Corridor | DELE |
| Delaware Water Gap National Recreation Area | DEWA |
| Denali National Park & Preserve (Formely Mount McKinley National Park) | DENA |
| Denver Service Center | DSC |
| Devils Postpile National Monument | DEPO |
| Devils Tower National Monument | DETO |
| Dinosaur National Monument | DINO |
| Dry Tortugas National Park (formerly Fort Jefferson National Monument) | DRTO (formerly FOJE) |
| Dwight D. Eisenhower Memorial | DDEM |
| Eastern Museum Laboratory | EML |
| Eastern Office of Design and Construction | EODC |
| Eastern Rivers and Mountains Network | ERMN |
| Ebey’s Landing National Historical Reserve | EBLA |
| Edgar Allan Poe National Historic Site | EDAL |
| Effigy Mounds National Monument | EFMO |
| Eisenhower National Historic Site | EISE |
| El Camino Real de los Tejas National Historic Trail | ELTE |
| El Camino Real de Tierra Adentro National Historic Trail | ELCA |
| El Malpais National Monument | ELMA |
| El Morro National Monument | ELMO |
| Eleanor Roosevelt National Historic Site | ELRO |
| Ellis Island (ELIS) | use STLI |
| Emmett Till and Mamie Till-Mobley National Monument | TILL |
| Erie Canalway National Heritage Cooridor | ERIE |
| Eugene O'Neill National Historic Site | EUON |
| Everglades National Park | EVER |
| Fallen Timbers Battlefield and Fort Miamis National Historic Site | FATI |
| Federal Hall National Memorial | FEHA |
| Fire Island National Seashore | FIIS |
| First Ladies National Historic Site | FILA |
| First State National Historical Park | FRST |
| Flathead River | See GLAC |
| Flight 93 National Memorial | FLNI |
| Florissant Fossil Beds National Monument | FLFO |
| Ford's Theatre National Historic Site | FOTH |
| Fort Bowie National Historic Site | FOBO |
| Fort Caroline National Memorial | use TIMU |
| Fort Davis National Historic Site | FODA |
| Fort Donelson National Battlefield | FODO |
| Fort Dupont Park | FODU |
| Fort Foote Park | FOFO |
| Fort Frederica National Monument | FOFR |
| Fort Laramie National Historic Site | FOLA |
| Fort Larned National Historic Site | FOLS |
| Fort Matanzas National Monument | FOMA |
| Fort McHenry National Monument and Historic Shrine | FOMC |
| Fort Monroe National Monument | FOMR |
| Fort Necessity National Battlefield | FONE |
| Fort Point National Historic Site | FOPO |
| Fort Pulaski National Monument | FOPU |
| Fort Raleigh National Historic Site | FORA |
| Fort Scott National Historic Site | FOSC |
| Fort Smith National Historic Site | FOSM |
| Fort Stanwix National Monument | FOST |
| Fort Sumter and Fort Moultire Historical Park (Fort Sumter National Monument) | FOSU |
| Fort Union National Monument | FOUN |
| Fort Union Trading Post National Historic Site | FOUS |
| Fort Vancouver National Historic Site | FOVA |
| Fort Washington Park | FOWA |
| Fossil Butte National Monument | FOBU |
| Franklin Delano Roosevelt Memorial (FRDE) | FDRM |
| Franklin Delano Roosevelt National Memorial | FRDE |
| Frederick Douglass National Historic Site | FRDO |
| Frederick Law Olmsted National Historic Site | FRLA |
| Fredericksburg & Spotsylvania National Military Park | FRSP |
| Freedom Riders National Monument | FRRI |
| Freedom's Way National Heritage Area | FRWA |
| Friendship Hill National Historic Site | FRHI |
| Gates of the Arctic National Park & Preserve | GAAR |
| Gateway Arch National Park (formerly Jefferson National Expansion Memorial) | JEFF |
| Gateway National Recreation Area | GATE |
| Gauley River National Recreation Area | GARI |
| General Grant National Memorial | GEGR |
| George Rogers Clark National Historical Park | GERO |
| George Washington Birthplace National Monument | GEWA |
| George Washington Carver National Monument | GWCA |
| George Washington Memorial Parkway | GWMP |
| Gettysburg National Military Park | GETT |
| Gila Cliff Dwellings National Monument | GICL |
| Glacier Bay National Park & Preserve | GLBA |
| Glacier National Park | GLAC |
| Glen Canyon National Recreation Area | GLCA |
| Glen Echo Park | GLEC |
| Gloria Dei Church National Historic Site | GLDE |
| Golden Gate National Recreation Area | GOGA |
| Golden Spike National Park (Historic Site) | GOSP |
| Governors Island National Monument | GOIS |
| Grand Canyon National Park | GRCA |
| Grand Portage National Monument | GRPO |
| Grand Teton National Park | GRTE |
| Grant-Kohrs Ranch National Historic Site | GRKO |
| Great Basin National Park | GRBA |
| Great Egg Harbor River | GREG |
| Great Falls Park | GRFA |
| Great Lakes Network | GLKN |
| Great Sand Dunes National Park & Preserve | GRSA |
| Great Smoky Mountains National Park | GRSM |
| Greater Yellowstone Network | GRYN |
| Green Springs National Historic Landmark District | GRSP |
| Greenbelt Park | GREE |
| Guadalupe Mountains National Park | GUMO |
| Guilford Courthouse National Military Park | GUCO |
| Gulf Coast Network | GULN |
| Gulf Islands National Seashore | GUIS |
| Gullah/Geechee Cultural Heritage Corridor | GUGE |
| Hagerman Fossil Beds National Monument | HAFO |
| Haleakalā National Park | HALE |
| Hamilton Grange National Memorial | HAGR |
| Hampton National Historic Site | HAMP |
| Harmony Hall | HAHA |
| Harpers Ferry Center | HFC |
| Harpers Ferry National Historical Park | HAFE |
| Harriet Tubman National Historical Park | HART |
| Harriet Tubman Underground Railroad National Historical Park | HATU |
| Harry S. Truman National Historic Site | HSTR |
| Hawai'i Volcanoes National Park | HAVO |
| Heartland Network | HTLN |
| Herbert Hoover National Historic Site | HEHO |
| Historic Jamestowne, Part of Colonial National Historical Park | JAME |
| Hohokam-Pima National Monument | PIMA |
| Home Of Franklin D. Roosevelt National Historic Site | HOFR |
| Homestead National Monument of America | HOME |
| Honouliuli Historic Site (National Monument) | HONO |
| Hopewell Culture National Historical Park | HOCU |
| Hopewell Furnace National Historic Site | HOFU |
| Hopewell Village National Historic Site (now Hopewell Furnace NHS) | HOVI |
| Horace Albright Training Center | HOAL |
| Horseshoe Bend National Military Park | HOBE |
| Hot Springs National Park | HOSP |
| Hovenweep National Monument | HOVE |
| Hubbell Trading Post National Historic Site | HUTR |
| Hudson River Valley National Heritage Area | HURV |
| Ice Age National Scenic Trail | IATR |
| Ice Age National Scientific Reserve | See IATR |
| Illinois and Michigan Canal National Heritage Corridor | ILMI |
| Independence National Historical Park | INDE |
| Indiana Dunes National Park (National Lakeshore) | INDU |
| Intermountain Region | IMR |
| Intermountain Regional Office | IMRO |
| Iñupiat Heritage Center | INUP |
| Isle Royale National Park | ISRO |
| James A. Garfield National Historic Site | JAGA |
| Jamestown National Historic Site (part of Colonial National Historical Park) | COLO, JAME |
| Jean Lafitte National Historical Park and Preserve | JELA |
| Jefferson National Expansion Memorial (now Gateway Arch National Park) | JNEM, JEFF |
| Jewel Cave National Monument | JECA |
| Jimmy Carter National Historic Site | JICA |
| John D. Rockefeller JR. Memorial Parkway | See GRTE |
| John Day Fossil Beds National Monument | JODA |
| John Fitzgerald Kennedy National Historic Site | JOFI |
| John H. Chafee Blackstone River Valley National Heritage Corridor | BLAC |
| John Muir National Historic Site | JOMU |
| John, Wild River | See GAAR |
| Johnstown Flood National Memorial | JOFL |
| Joshua Tree National Park | JOTR |
| Juan Bautista de Anza National Historic Trail | JUBA |
| Kalaupapa National Historical Park | KALA |
| Kaloko-Honokōhau National Historical Park | KAHO |
| Katahdin Woods and Waters National Monument | KAWW |
| Katmai National Park & Preserve | KATM |
| Kenai Fjords National Park | KEFJ |
| Kenilworth Park and Aquatic Gardens | KEAQ |
| Kennesaw Mountain National Battlefield Park | KEMO |
| Kern River | See Seki |
| Keweenaw National Historical Park | KEWE |
| Kings Mountain National Military Park | KIMO |
| Kings River | See SEKI |
| Klamath Network | KLMN |
| Klondike Gold Rush - Seattle Unit National Historical Park | KLSE |
| Klondike Gold Rush National Historical Park | KLGO |
| Knife River Indian Villages National Historic Site | KNRI |
| Kobuk Valley National Park | KOVA |
| Kobuk Wild River | See GAAR |
| Korean War Veterans National Memorial | KOWA |
| Lady Bird Johnson Park | See GWMP |
| Lake Chelan National Recreation Area | See NOCA |
| Lake Clark National Park & Preserve | LACL |
| Lake Mead National Recreation Area | LAKE (formerly LAME) |
| Lake Meredith National Recreation Area | LAMR |
| Lake Roosevelt National Recreation Area | LARO |
| Lassen Volcanic National Park | LAVO |
| Lava Beds National Monument | LABE |
| Lehman Caves National Monument | See GRBA |
| Lewis and Clark National Historic Trail | LECL |
| Lewis and Clark National Historical Park | LEWI |
| Lincoln Boyhood National Memorial | LIBO |
| Lincoln Home National Historic Site | LIHO |
| Lincoln Memorial | LINC |
| Little Bighorn Battlefield National Monument | LIBI |
| Little River Canyon National Preserve | LIRI |
| Little Rock Central High School National Historic Site | CHSC |
| Longfellow House - Washington's Headquarters National Historic Site | LONG |
| Lowell National Historical Park | LOWE |
| Lower Delaware Wild and Scenic River | LODE |
| Lower East Side Tenement Museum National Historic Site | LOEA |
| Lyndon B. Johnson National Historical Park | LYJO |
| Lyndon Baines Johnson Memorial Grove on the Potomac | LYBA |
| Maggie L. Walker National Historic Site | MAWA |
| Maine Acadian Culture | MAAC |
| Mammoth Cave National Park | MACA |
| Manassas National Battlefield Park | MANA |
| Manhattan Project National Historical Park | MAPR |
| Manzanar National Historic Site | MANZ |
| Marsh-Billings-Rockefeller National Historical Park | MABI |
| Martin Luther King Jr National Memorial | MLKM |
| Martin Luther King, Jr. National Historical Park | MALU |
| Martin Van Buren National Historic Site | MAVA |
| Mary McLeod Bethune Council House National Historic Site | MAMC |
| Mather Training Center | MTC |
| Medgar and Myrlie Evers Home National Monument | MEMY |
| Mediterranean Coast Network | MEDN |
| Merced River | See YOSE |
| Meridian Hill Park | MEHI |
| Mesa Verde National Park | MEVE |
| Mid-Atlantic Network | MIDN |
| Mid-Atlantic Regional Office | MARO |
| Midwest Archeological Center | MWAC |
| Midwest Region | MWR |
| Midwest Regional Office | MWRO |
| Mill Springs Battlefield National Monument | MISP |
| Minidoka National Historic Site | MIIN |
| Minute Man National Historical Park | MIMA |
| Minuteman Missile National Historic Site | MIMI |
| Mississippi Delta National Heritage Area | MIDE |
| Mississippi Hills National Heritage Area | MIHI |
| Mississippi National River and Recreation Areas | MISS |
| Missouri National Recreational River | MNRR |
| Mojave Desert Network | MOJN |
| Mojave National Preserve | MOJA |
| Monocacy National Battlefield | MONO |
| Montezuma Castle National Monument | MOCA |
| Moores Creek National Battlefield | MOCR |
| Mormon Pioneer National Historic Trail | MOPI |
| Morristown National Historical Park | MORR |
| MotorCities National Heritage | AUTO |
| Mount Rainier National Park | MORA |
| Mount Rushmore National Memorial | MORU |
| Muir Woods National Monument | MUWO |
| Mulchanta Wild River | See LACL |
| Muscle Shoals National Heritage Area | MUSH |
| Museum Resource Center | MRCE |
| Natchez National Historical Park | NATC |
| Natchez Trace National Scenic Trail | NATT |
| Natchez Trace Parkway | NATR |
| National Aviation Heritage Area | AVIA |
| National Capital Parks | NCP |
| National Capital Parks-East | NACE |
| National Capital Region | NCR |
| National Capital Region Network | NCRN |
| National Coal Heritage Area | COAL |
| National Mall and Memorial Parks | NAMA |
| National Park of American Samoa | NPSA |
| National Parks of New York Harbor | NPNH |
| National Park Service History Collection (formerly the NPS Archives) | HFCA |
| Natural Bridges National Monument | NABR |
| Navajo National Monument | NAVA |
| New Bedford Whaling National Historical Park | NEBE |
| New England National Scenic Trail | NEEN |
| New Jersey Coastal Heritage Trail Route | NEJE |
| New Jersey Pinelands National Reserve | PINE |
| New Orleans Jazz National Historical Park | JAZZ |
| New River Gorge National River | NERI |
| Nez Perce National Historical Park | NEPE |
| Niagara Falls National Heritage Area | NIFA |
| Nicodemus National Historic Site | NICO |
| Ninety Six National Historic Site | NISI |
| Niobrara National Scenic River | NIOB |
| Noatak National Preserve | NOAT |
| North Cascades National Park | NOCA |
| North Coast and Cascades Network | NCCN |
| North Country National Scenic Trail | NOCO |
| North Fork of the Koykuk River | See GAAR |
| Northeast Coastal and Barrier Network | NCBN |
| Northeast Region | NER |
| Northeast Regional Office | NERO |
| Northeast Temperate Network | NETN |
| Northern Colorado Plateau Network | NCPN |
| Northern Great Plains Network | NGPN |
| Northern Plains National Heritage Area | See KNRI |
| Northern Rio Grande National Heritage Area | NORG |
| Obed Wild & Scenic River | OBED |
| Ocmulgee Mounds National Historical Park (formerly Ocmulgee National Monument) | OCMU |
| Ohio and Erie National Heritage Canalway | See CUVA |
| Oil Region National Heritage Area | OIRE |
| Oklahoma City National Memorial | OKCI |
| Old Kassan National Monument (abolished) | See AKR |
| Old Spanish National Historic Trail | OLSP |
| Olympic National Park | OLYM |
| Oregon Caves National Monument & Preserve | ORCA |
| Oregon National Historic Trail | OREG |
| Organ Pipe Cactus National Monument | ORPI |
| Overmountain Victory National Historic Trail | OVVI |
| Oxon Cove Park & Oxon Hill Farm | OXHI |
| Ozark National Scenic Riverways | OZAR |
| Pacific Islands Network | PACN |
| Pacific West Regional Office | PWRO |
| Padre Island National Seashore | PAIS |
| Palo Alto Battlefield National Historical Park | PAAL |
| Parashant National Monument | PARA |
| Paterson Great Falls National Historical Park | PAGR |
| Pea Ridge National Military Park | PERI |
| Pearl Harbor National Memorial | See VALR |
| Pecos National Historical Park | PECO |
| Pennsylvania Avenue National Historic Site | PAAV |
| Perry's Victory & International Peace Memorial | PEVI |
| Petersburg National Battlefield | PETE |
| Petrified Forest National Park | PEFO |
| Petroglyph National Monument | PETR |
| Pictured Rocks National Lakeshore | PIRO |
| Pinnacles National Park | PINN |
| Pipe Spring National Monument | PISP |
| Pipestone National Monument | PIPE |
| Piscataway Park | PISC |
| Point Reyes National Seashore | PORE |
| Pony Express National Historic Trail | POEX |
| Port Chicago Naval Magazine National Memorial | POCH |
| Potomac Heritage National Scenic Trail | POHE |
| Poverty Point National Monument | POPO |
| President William Jefferson Clinton Birthplace Home National Historic Site | WICL |
| President's Park (White House) | WHHO |
| Presidio of San Francisco | PRSF |
| Prince William Forest Park | PRWI |
| Pullman National Monument | PULL |
| Pu'uhonua O Hōnaunau National Historical Park | PUHO |
| Pu'ukoholā Heiau National Historic Site | PUHE |
| Quinebag and Shetucket Rivers Valley | QUSH |
| Rainbow Bridge National Monument | RABR |
| Reconstruction Era Historical Park (National Monument) | REER |
| Redwood National and State Parks | REDW |
| Richmond National Battlefield Park | RICH |
| Rio Grande Wild & Scenic River | RIGR |
| River Raisin National Battlefield Park | RIRA |
| River Styx Wild and Scenic River | See ORCA |
| Rivers of Steel National Heritage Area | RIST |
| Rock Creek Park | ROCR |
| Rocky Mountain National Park | ROMO |
| Rocky Mountain Network | ROMN |
| Roger Williams National Memorial | ROWI |
| Roosevelt Campobello International Park | ROCA |
| Roosevelt-Vanderbilt National Historic Sites | ROVA |
| Rosie the Riveter/World War II Home Front National Historical Park | RORI |
| Ross Lake National Recreation Area | See NOCA |
| Russell Cave National Monument | RUCA |
| Sagamore Hill National Historic Site | SAHI |
| Saguaro National Park | SAGU |
| Saint Croix Island International Historic Site | SACR |
| Saint Croix National Scenic Riverway | SACN |
| Saint Paul's Church National Historic Site | SAPA |
| Saint-Gaudens National Historical Park (Historic Site) | SAGA |
| Salem Maritime National Historic Site | SAMA |
| Salinas Pueblo Missions National Monument | SAPU |
| Salmon Wild River | See KOVA |
| Salt River Bay National Historical Park and Ecological Preserve | SARI |
| San Antonio Missions National Historical Park | SAAN |
| San Francisco Bay Area Network | SFAN |
| San Francisco Maritime National Historical Park | SAFR |
| San Juan Island National Historical Park | SAJH |
| San Juan National Historic Site | SAJU |
| Sand Creek Massacre National Historic Site | SAND |
| Sangre de Cristo National Heritage Area | See GRSA |
| Santa Monica Mountains National Recreation Area | SAMO |
| SantaFe National Historic Trail | SAFE |
| Saratoga National Historical Park | SARA |
| Saugus Iron Works National Historic Site | SAIR |
| Schuylkill River Valley National Heritage Area | SCRV |
| Scotts Bluff National Monument | SCBL |
| Selma to Montgomery National Historic Trail | SEMO |
| Sequoia & Kings Canyon National Parks | SEKI |
| Shenandoah National Park | SHEN |
| Shiloh National Military Park | SHIL |
| Sierra Nevada Netework | SIEN |
| Silos and Smokestacks National Heritage Area (See America's Agricultural and Heritage Partnership) | See MWR |
| Sitka National Historical Park | SITK |
| Sleeping Bear Dunes National Lakeshore | SLBE |
| Snake River Headwaters Wild and Scenic River | See GRTE or YELL |
| Sonoran Desert Network | SODN |
| South Carolina National Heritage Corridor | SOCA |
| South Florida/Caribbean Network | SFCN |
| South Park National Heritage Area (No Acronym) | See IMR |
| Southeast Alaska Network | SEAN |
| Southeast Archeological Center | SEAC |
| Southeast Coast Network | SECN |
| Southeast Region | SER |
| Southeast Regional Office | SERO |
| Southern Colorado Plateau Network | SCPN |
| Southern Plains Network | SOPN |
| Southwest Alaska Network | SWAN |
| Southwest Archeological Center | SWAC |
| Southwest Region | SWR |
| Southwest Regional Office | SWRO |
| Springfield Armory National Historic Site | SPAR |
| Star-Spangled Banner National Historic Trail | STSP |
| Statue Of Liberty National Monument | STLI |
| Ste. Genevieve National Historical Park | STGE |
| Steamtown National Historic Site | STEA |
| Stones River National Battlefield | STRI |
| Stonewall National Monument | STON |
| Sudbury, Assabet and Cocord National Wild and Scenic River (Northeast Region) | See NER |
| Suitland Parkway | See NACE |
| Sunset Crater Volcano National Monument | SUCR |
| Tallgrass Prairie National Preserve | TAPR |
| Taunton National Wild and Scenic River (Northeast Region) | See NER |
| Tennessee Civil War National Heritage Area | TECW |
| Thaddeus Kosciuszko National Memorial | THKO |
| The Last Green Valley National Heritage Corridor | See QUSH |
| Theodore Roosevelt Birthplace National Historic Site | THRB |
| Theodore Roosevelt Inaugural National Historic Site | THRI |
| Theodore Roosevelt Island | THIS |
| Theodore Roosevelt National Park | THRO |
| Thomas Cole National Historic Site | THCO |
| Thomas Edison National Historical Park | EDIS |
| Thomas Jefferson Memorial | THJE |
| Thomas Stone National Historic Site | THST |
| Timpanogos Cave National Monument | TICA |
| Timucuan Ecological & Historic Preserve | TIMU |
| Tinayguk Wild River | See GAAR |
| Tlikakila Wild River | See LACL |
| Tonto National Monument | TONT |
| Touro Synagogue National Historic Site | TOSY |
| Trail of Tears National Historic Trail | TRTE |
| Tule Lake National Monument | TULE |
| Tule Springs Fossil Beds National Monument | TUSK |
| Tumacácori National Historical Park | TUMA |
| Tupelo National Battlefield | TUPE |
| Tuskegee Airmen National Historic Site | TUAI |
| Tuskegee Institute National Historic Site | TUIN |
| Tuzigoot National Monument | TUZI |
| U.S. Park Police | USPP |
| Ulysses S. Grant National Historic Site | ULSG |
| Upper Columbia Basin Network | UCBN |
| Upper Delaware Scenic & Recreational River | UPDE |
| Upper Housatonic Valley National Heritage Area | UPHV |
| Valles Caldera National Preserve | VALL |
| Valley Forge National Historical Park | VAFO |
| Vanderbilt Mansion National Historic Site | VAMA |
| Vicksburg National Military Park | VICK |
| Vietnam Veterans Memorial | VIVE |
| Virgin Islands Coral Reef National Monument | VICR |
| Virgin Islands National Park | VIIS |
| Voyageurs National Park | VOYA |
| Waco Mammoth National Monument | WACO |
| Walnut Canyon National Monument | WACA |
| War In The Pacific National Historical Park | WAPA |
| Washington Monument | WAMO |
| Washington Office | WASO |
| Washington-Rochambeau Revolutionary Route National Historic Trail | WARO |
| Washita Battlefield National Historic Site | WABA |
| Weir Farm National Historic Site | WEFA |
| Wekiva National Wild and Scenic River (Southeast Region) | See SER |
| Western Archeological and Conservation Center | WACC |
| Western Museum Laboratory | WML |
| Western Regional Office | WRO |
| Westfield National Wild and Scenic River (Northeast Region) | See NER |
| Wheeling National Heritage Area | WHEE |
| Whiskeytown National Recreation Area | WHIS |
| White Clay Creek Wild and Scenic River (Philidelphia Region) | See NER |
| White Sands National Park (formerly White Sands National Monument) | WHSA |
| Whitman Mission National Historic Site | WHMI |
| William Howard Taft National Historic Site | WIHO |
| Wilson's Creek National Battlefield | WICR |
| Wind Cave National Park | WICA |
| Wing Luke Museum of the Asian Pacific American Experience | WING |
| Wolf River | See SER |
| Wolf Trap National Park for the Performing Arts (formerly Wolf Trap Farm Park) | WOTR |
| Women's Rights National Historical Park | WORI |
| World War I Memorial | See NAMA |
| World War II Memorial National Memorial | WWII |
| World War II Valor in the Pacific National Monument | VALR |
| Wrangell - St. Elias National Park & Preserve | WRST |
| Wright Brothers National Memorial | WRBR |
| Wupatki National Monument | WUPA |
| Yellowstone National Park | YELL |
| Yorktown Battlefield (part of Colonial National Historical Park) | COLO, YORK |
| Yosemite National Park | YOSE |
| Yucca House National Monument | YUHO |
| Yukon-Charley Rivers National Preserve | YUCH |
| Yuma Crossing National Heritage Area | YUCR |
| Zion National Park | ZION |
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