Protected areas designated by the President of the United States or by legislation through the United States Congress.
Congress authorized the President of the United States to set aside areas as national monuments with the Antiquities Act of 1906 to protect “objects of historic and scientific interest.”
| Park Name | Established | State/Territory | Photo Gallery Region | Ecoregion | Management Agency | |
|---|---|---|---|---|---|---|
 | DEVILS TOWER National Monument | 1906 09|September 24 | Wyoming | Great Plains | Arid | National Park Service (NPS) |
 | EL MORRO National Monument | 1906 12|December 08 | New Mexico | Colorado Plateau | Arid | National Park Service (NPS) |
 | MONTEZUMA CASTLE National Monument | 1906 12|December 08 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | TONTO National Monument | 1907 10|October 21 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | GILA CLIFF DWELLINGS National Monument | 1907 11|November 16 | New Mexico | American Southwest | Arid | National Park Service (NPS) |
 | MUIR WOODS National Monument | 1908 01|January 09 | California | California | Humid Temperate | National Park Service (NPS) |
 | JEWEL CAVE National Monument | 1908 02|February 07 | South Dakota | Great Plains | Arid | National Park Service (NPS) |
 | NATURAL BRIDGES National Monument | 1908 04|April 16 | Utah | Colorado Plateau | Arid | National Park Service (NPS) |
 | NAVAJO National Monument | 1909 03|March 20 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | OREGON CAVES National Monument | 1909 07|July 12 | Oregon | Pacific Northwest | Humid Temperate | National Park Service (NPS) |
 | SALINAS PUEBLO MISSONS National Monument | 1909 11|November 01 | New Mexico | American Southwest | Arid | National Park Service (NPS) |
 | RAINBOW BRIDGE National Monument | 1910 05|May 30 | Utah | Colorado Plateau | Arid | National Park Service (NPS) |
 | DEVILS POSTPILE National Monument | 1911 05|May 06 | California | California | Humid Temperate | National Park Service (NPS) |
 | COLORADO National Monument | 1911 05|May 24 | Colorado | Colorado Plateau | Arid | National Park Service (NPS) |
 | DINOSAUR National Monument | 1915 10|October 04 | Colorado Utah | Rocky Mountains | Arid | National Park Service (NPS) |
 | WALNUT CANYON National Monument | 1915 11|November 30 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | BANDELIER National Monument | 1916 02|February 11 | New Mexico | Rocky Mountains | Arid | National Park Service (NPS) |
 | CAPULIN VOLCANO National Monument | 1916 08|August 09 | New Mexico | Great Plains | Arid | National Park Service (NPS) |
 | CASA GRANDE RUINS National Monument | 1918 08|August 03 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | SCOTTS BLUFF National Monument | 1919 12|December 12 | Nebraska | Great Plains | Arid | National Park Service (NPS) |
 | YUCCA HOUSE National Monument | 1919 12|December 19 | Colorado | Colorado Plateau | Arid | National Park Service (NPS) |
 | TIMPANOGOS CAVE National Monument | 1922 10|October 14 | Utah | Rocky Mountains | Arid | National Park Service (NPS) |
 | AZTEC RUINS National Monument | 1923 01|January 24 | New Mexico | Colorado Plateau | Arid | National Park Service (NPS) |
 | HOVENWEEP National Monument | 1923 03|March 02 | Colorado Utah | Colorado Plateau | Arid | National Park Service (NPS) |
 | PIPE SPRING National Monument | 1923 05|May 31 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | CHIRICAHUA National Monument | 1924 04|April 18 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | CRATERS OF THE MOON National Monument | 1924 05|May 02 | Idaho | Basin & Range / Columbia Plateau | Arid | National Park Service (NPS) & Bureau of Land Management (BLM) |
 | WUPATKI National Monument | 1924 12|December 09 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | LAVA BEDS National Monument | 1925 11|November | California | California | Humid Temperate | National Park Service (NPS) |
 | SUNSET CRATER VOLCANO National Monument | 1930 05|May 30 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | CANYON DE CHELLY National Monument | 1931 04|April 01 | Arizona | Colorado Plateau | Arid | National Park Service (NPS) |
 | WHITE SANDS National Monument (upgraded to a National Park 12-DEC-2019) | 1933 07|July 25 | New Mexico | American Southwest | Arid | National Park Service (NPS) |
 | CEDAR BREAKS National Monument | 1933 08|August 22 | Utah | Colorado Plateau | Arid | National Park Service (NPS) |
 | HOMESTEAD National Monument | 1936 03|March 19 | Nebraska | Great Plains | Arid | National Park Service (NPS) |
 | OCMULGEE National Monument | 1936 12|December 23 | Georgia | Atlantic East Coast | Humid Temperate | National Park Service (NPS) |
 | ORGAN PIPE CACTUS National Monument | 1937 04|April 13 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | PIPESTONE National Monument | 1937 08|August 25 | Minnesota | Great Plains | Arid | National Park Service (NPS) |
 | TUZIGOOT National Monument | 1939 07|July 25 | Arizona | American Southwest | Arid | National Park Service (NPS) |
 | EFFIGY MOUNDS National Monument | 1949 10|October 25 | Iowa | Central Interior | Humid Temperate | National Park Service (NPS) |
 | GRAND PORTAGE National Monument | 1960 01|January 27 | Minnesota | Great Lakes | Humid Temperate | National Park Service (NPS) |
 | RUSSELL CAVE National Monument | 1961 05|May 11 | Alabama | Appalachian Mountains | Humid Temperate | National Park Service (NPS) |
 | ALIBATES FLINT National Monument | 1965 08|August 21 | Texas | Great Plains | Arid | National Park Service (NPS) |
 | FLORISSANT FOSSIL BEDS National Monument | 1969 08|August 20 | Colorado | Rocky Mountains | Arid | National Park Service (NPS) |
 | FOSSIL BUTTE National Monument | 1972 10|October 23 | Wyoming | Rocky Mountains | Arid | National Park Service (NPS) |
 | JOHN DAY FOSSIL BEDS National Monument | 1974 10|October 26 | Oregon | Basin & Range / Columbia Plateau | Arid | National Park Service (NPS) |
 | ADMIRALTY ISLAND National Monument | 1978 12|December 01 | Alaska | Alaska | Humid Temperate | United States Forest Service (USFS) |
 | MISTY FJORDS National Monument | 1978 12|December 01 | Alaska | Alaska | Humid Temperate | United States Forest Service (USFS) |
 | MOUNT ST. HELENS National Volcanic Monument | 1982 08|August 27 | Washington | Pacific Northwest | Humid Temperate | United States Forest Service (USFS) |
 | EL MALPAIS National Monument | 1987 12|December 31 | New Mexico | Colorado Plateau | Arid | National Park Service (NPS) |
 | HAGERMAN FOSSIL BEDS National Monument | 1988 11|November 18 | Idaho | Basin & Range / Columbia Plateau | Arid | National Park Service (NPS) |
 | PETROGLYPH National Monument | 1990 06|June 27 | New Mexico | Colorado Plateau | Arid | National Park Service (NPS) |
 | NEWBERRY National Volcanic Monument | 1990 11|November 05 | Oregon | Pacific Northwest | Humid Temperate | United States Forest Service (USFS) |
 | GRAND STAIRCASE- ESCALANTE National Monument | 1996 09|September 18 | Utah | Colorado Plateau | Arid | Bureau of Land Management (BLM) |
 | AGATE FOSSIL BEDS National Monument | 1997 06|June 14 | Nebraska | Great Plains | Arid | National Park Service (NPS) |
 | CALIFORNIA COASTAL National Monument | 2000 01|January | California | California | Humid Temperate | Bureau of Land Management (BLM) |
 | AGUA FRIA National Monument | 2000 01|January 11 | Arizona | American Southwest | Arid | Bureau of Land Management (BLM) |
 | GRAND CANYON- PARASHANT National Monument | 2000 01|January 11 | Arizona | Colorado Plateau | Arid | Bureau of Land Management (BLM) & National Park Service (NPS) |
 | GIANT SEQUOIA National Monument | 2000 04|April 15 | California | California | Humid Temperate | United States Forest Service (USFS) |
 | HANFORD REACH National Monument | 2000 06|June 08 | Washington | Basin & Range / Columbia Plateau | Arid | Fish and Wildlife Service (FWS) & Department of Energy (DOE) |
 | CANYONS OF THE ANCIENTS National Monument | 2000 06|June 09 | Colorado | Colorado Plateau | Arid | Bureau of Land Management (BLM) |
 | CASCADE-SISKIYOU National Monument | 2000 06|June 09 | Oregon | Pacific Northwest | Humid Temperate | Bureau of Land Management (BLM) |
 | IRONWOOD FOREST National Monument | 2000 06|June 09 | Arizona | American Southwest | Arid | Bureau of Land Management (BLM) |
 | SANTA ROSA AND SAN JACINTO MOUNTAINS National Monument | 2000 10|October 24 | California | California | Arid | Bureau of Land Management (BLM) & United States Forest Service (USFS) |
 | VERMILION CLIFFS National Monument | 2000 11|November 09 | Arizona | Colorado Plateau | Arid | Bureau of Land Management (BLM) |
 | CARRIZO PLAIN National Monument | 2001 01|January 12 | California | California | Humid Temperate | Bureau of Land Management (BLM) |
 | KASHA-KATUWE TENT ROCKS National Monument | 2001 01|January 17 | New Mexico | Rocky Mountains | Arid | Bureau of Land Management (BLM) |
 | POMPEYS PILLAR National Monument | 2001 01|January 17 | Montana | Great Plains | Arid | Bureau of Land Management (BLM) |
 | SONORAN DESERT National Monument | 2001 01|January 17 | Arizona | American Southwest | Arid | Bureau of Land Management (BLM) |
 | UPPER MISSOURI RIVER BREAKS National Monument | 2001 01|January 17 | Montana | Great Plains | Arid | Bureau of Land Management (BLM) |
 | VIRGIN ISLANDS CORAL REEF National Monument | 2001 01|January 17 | United States Virgin Islands | Tropical East - US Virgin Islands | Humid Tropical | National Park Service (NPS) |
 | PREHISTORIC TRACKWAYS National Monument | 2009 03|March 30 | New Mexico | American Southwest | Arid | Bureau of Land Management (BLM) |
 | CHIMNEY ROCK National Monument | 2012 09|September 21 | Colorado | Colorado Plateau | Arid | United States Forest Service (USFS) |
 | RIO GRANDE DEL NORTE National Monument | 2013 03|March 25 | New Mexico | Rocky Mountains | Arid | Bureau of Land Management (BLM) |
 | SAN JUAN ISLANDS National Monument | 2013 03|March 25 | Washington | Pacific Northwest | Humid Temperate | Bureau of Land Management (BLM) |
 | ORGAN MOUNTAINS- DESERT PEAKS National Monument | 2014 05|May 21 | New Mexico | American Southwest | Arid | Bureau of Land Management (BLM) |
 | SAN GABRIEL MOUNTAINS National Monument | 2014 10|October 10 | California | California | Arid | United States Forest Service (USFS) |
 | TULE SPRINGS FOSSIL BEDS National Monument | 2014 12|December 19 | Nevada | Basin & Range / Columbia Plateau | Arid | National Park Service (NPS) |
 | BROWNS CANYON National Monument | 2015 02|February 19 | Colorado | Rocky Mountains | Arid | Bureau of Land Management (BLM) & United States Forest Service (USFS) |
 | BASIN and RANGE National Monument | 2015 07|July 10 | Nevada | Basin & Range / Columbia Plateau | Arid | Bureau of Land Management (BLM) |
 | BERRYESSA SNOW MOUNTAIN National Monument | 2015 07|July 10 | California | California | Humid Temperate | United States Forest Service (USFS) |
 | CASTLE MOUNTAINS National Monument | 2016 02|February 12 | California | California | Arid | National Park Service (NPS) |
 | MOJAVE TRAILS National Monument | 2016 02|February 12 | California | California | Arid | Bureau of Land Management (BLM) |
 | SAND TO SNOW National Monument | 2016 02|February 16 | California | California | Arid | Bureau of Land Management (BLM) & United States Forest Service (USFS) |
 | KATAHDIN WOODS AND WATERS National Monument | 2016 08|August 24 | Maine | Appalachian Mountains | Humid Temperate | National Park Service (NPS) |
 | BEARS EARS National Monument | 2016 12|December 28 | Utah | Colorado Pleateau | Arid | Bureau of Land Management (BLM) & United States Forest Service (USFS) |
 | GOLD BUTTE National Monument | 2016 12|December 28 | Nevada | Basin & Range / Columbia Plateau | Arid | Bureau of Land Management (BLM) |