In 1872, there was no state government to manage it (The state of Wyoming did not exist at that time), so the federal government assumed direct control. Yellowstone National Park was created as the first national park in the United States. NPS Preliminary Survey party, Great Smoky Mountains, 1931 The agency is charged with a dual role of preserving the ecological and historical integrity of the places entrusted to its management while also making them available and accessible for public use and enjoyment. As of 2019, they had more than 279,000 volunteers.

The NPS employs approximately 20,000 people in 424 individual units covering over 85 million acres (0.34 million km 2) in all 50 states, the District of Columbia, and U.S. It is headquartered in Washington, D.C., within the main headquarters of the Department of the Interior. Congress created the agency on August 25, 1916, through the National Park Service Organic Act. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational properties with various title designations. The National Park Service ( NPS) is an agency of the United States federal government within the U.S. Charles Sams, Director of the National Park Service.

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