List of areas in the United States National Park System

Yet Jean Lafitte National Historical Park and Preserve is counted as one unit, despite its double designation.

Each site has a management plan consistent with its ecological, historic, and recreational resources and its enabling legislation.

National Park System units are found in all 50 states, the District of Columbia, and the U.S. territories of Guam, American Samoa, the U.S. Virgin Islands, and Puerto Rico.

The territory of the Northern Mariana Islands has an affiliated area but not an official NPS unit.

[2] The national parks are considered the "crown jewels" of the system and are typically larger than other areas, including a variety of significant ecological and geological resources.

Of these, 87 (all except Grand Canyon-Parashant and Avi Kwa Ame) are NPS official units.

Three, Grand Canyon–Parashant, Craters of the Moon, and Avi Kwa Ame 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.

[2] Another 22 national recreation areas are administered by the Forest Service and Bureau of Land Management.

The NPS also owns conservation easements (but not the land itself) for part of the area called the Green Springs National Historic Landmark District.

In the 1930s and 1940s, the NPS developed dozens of recreational demonstration areas, most of which eventually became national or state parks.