The system includes 419 areas covering more than 85 million acres in every state, the District of Columbia, American Samoa, Guam, Puerto Rico, and the Virgin Islands. These areas include national parks, monuments, battlefields, military parks, historical parks, historic sites, lakeshores, seashores, recreation areas, scenic rivers and trails, and the White House. Learn more about national park designations. See the complete list of National Park Service units and related areas by type and number. The National Park Service is a bureau of the Department of the Interior. Directly overseeing its operation is the department's Assistant Secretary for Fish, Wildlife and Parks.