List of areas in the United States National Park System

The National Park System of the United States is the collection of physical properties owned or administered by the National Park Service. The collection includes all national parks and most national monuments, as well as several other types of protected areas of the United States.
As of December 2020, there are units of the National Park System. However, this number is somewhat misleading. For example, Denali National Park and Preserve is counted as two units, since the same name applies to a national park and an adjacent national preserve. Yet Jean Lafitte National Historical Park and Preserve is counted as one unit, despite its double designation. Counting methodology is typically based on the language of a park's authorizing legislation.
Although the designations generally reflect sites' features, all units of the system are considered administratively equal and with few exceptions the designations themselves do not define their level of protection. Each site has a management plan consistent with its ecological, historic, and recreational resources and its enabling legislation.
In addition to areas of the National Park System, the National Park Service also provides technical and financial assistance to several affiliated areas authorized by Congress. Affiliated areas are marked on the lists below.
National Park System units are found in all 50 states, the District of Columbia, and the U.S. territories of Guam, the Northern Mariana Islands, American Samoa, the U.S. Virgin Islands, and Puerto Rico.
Nearly all units managed by the National Park Service participate in the National Park Passport Stamps program.
National parks.
There are 63 officially designated national parks in the United States and its dependent areas. The national parks are considered the "crown jewels" of the system and are typically larger, including a variety of significant ecological and geological resources
National monuments.
As of 2021, there are 129 national monuments, 85 of which are administered by the NPS and are listed below. The remaining 44 monuments are administered by five other federal agencies. Two, Grand Canyon–Parashant and Craters of the Moon National Monuments, are jointly administered by the NPS and the Bureau of Land Management, and Tule Lake National Monument is joint with the Fish and Wildlife Service. National monuments are typically smaller and protect just one or few major resources. They include both natural and historical sites and can be established by the president under the Antiquities Act.
National preserves.
There are 19 national preserves in the United States. Ten are distinct stand-alone official units of the National Park System, while nine others are merely areas of distinct management policies and land-use restrictions within a larger "national park and preserve" or "national monument and preserve" that are counted as two units of the National Park System by the National Park Service. Three other sites are areas of distinct management policies and land-use restrictions within a larger park (Oregon Caves National Monument and Preserve, Jean Lafitte National Historical Park and Preserve, and New River Gorge National Park and Preserve) but by statute are counted by the National Park Service as single units of the National Park System.
National historical parks.
There are 61 national historical parks.
National historic sites.
The National Park Service administers the national historic sites, with the exception of Grey Towers National Historic Site (managed by the U.S. Forest Service) and those that are managed as affiliated areas of the National Park System.
There are 87 national historic sites, of which 76 are NPS units and 11 are affiliated areas.
National memorials.
There are 31 national memorials that are NPS units and five affiliated national memorials.
National recreation areas.
There are 18 national recreation areas administered by the National Park Service. Another 22 national recreation areas are administered by the Forest Service and Bureau of Land Management.
National seashores.
There are 10 national seashores.
National lakeshores.
There are three national lakeshores, located in Michigan and Wisconsin.
National rivers and national wild and scenic rivers.
There are four national rivers (marked with an asterisk) and ten national wild and scenic rivers administered as distinct units of the National Park System. There are many more national wild and scenic rivers that run through other units.
National reserves.
National reserves are partnerships between federal, state, and local authorities. Within the boundaries of the three national reserves are combinations of federal land (Park Service or National Wildlife Refuges), state parks and forests, local public lands, and private properties. 
National parkways.
Ten roadways and surrounding scenic areas are managed by the NPS as parkways, four of which as official units and five as part of other units.
National historic and scenic trails.
These National Park Service trails are part of the larger National Trails System. Only three of the trails are considered official units of the park system.
National cemeteries.
Most national cemeteries are administered by the Department of Veterans Affairs, although a few are managed by the National Park Service and the U.S. Army. None of the cemeteries are considered official units of the system; they are all affiliated with other parks.
National heritage areas.
The National Park Service provides limited assistance to national heritage areas, but does not administer them.
Other NPS protected areas and administrative groups.
There are 11 NPS units of other designations, as well as other affiliated areas. The National Mall and national capital parks have many sites, some of which are also units of other designations and some are also national historic sites.
There are also various administrative groups of listed parks, such as Manhattan Sites, National Parks of New York Harbor, and Western Arctic National Parklands. The NPS also owns conservation easements (but not the land itself) for part of the area called the Green Springs National Historic Landmark District.
Former other areas.
In the 1930s and 1940s, the NPS developed dozens of recreational demonstration areas, most of which eventually became national or state parks.