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Federal lands are lands in the United States owned by the federal government. Pursuant to the Property Clause of the United States Constitution (Article Four, section 3, clause 2), the Congress has the power to retain and sell foreign lands and to regulate federal lands, such as by limiting cattle grazing on them. These powers have been recognized in a long line of U.S. Supreme Court decisions.
The federal government owns about 640 million acres of land in the United States, about 28% of the total land area of 2.27 billion acres. The majority of federal lands (610.1 million acres in 2015) are administered by the Bureau of Land Management (BLM), U.S. Fish and Wildlife Service (FWS), National Park Service (NPS), or U.S. Forest Service (FS). BLM, FWS, and NPS are part of the U.S. Department of the Interior, while the Forest Service is part of the U.S. Department of Agriculture. An additional 11.4 million acres of land (about 2% of all federal land) is owned by the U.S. Department of Defense (DOD). The majority of federal lands are located in Alaska and the Western states.
The United States Supreme Court has upheld the broad powers of the federal government to deal with federal lands, for example having unanimously held in Kleppe v. New Mexico that "the complete power that Congress has over federal lands under this clause necessarily includes the power to regulate and protect wildlife living there, state law notwithstanding."
Lands held by the United States in trust for Native American tribes are generally not considered public lands. There are some 55 million acres of land held in trust by the federal government for Indian tribes and almost 11 million acres of land held in trust by the federal government for individual Natives. Although the United States holds legal title to these lands, the tribe or individual holds beneficial title (the right to use and benefit from the property). As a result, Indian Country is "quasi-private, not public, land." Nevertheless, "because the United States is a legal title holder, the federal government is a necessary part in all leases and dispositions of resources including trust land. For example, the secretary of the interior must approve any contract for payment or grant by an Indian tribe for services for the tribe 'relative to their lands' (25 U.S.C. § 81)."
The four primary federal land holders are:
The fifth largest federal landowner is the U.S. Department of Defense, which owns, leases, or possessed 26.1 million worldwide, of which 11.4 million acres are located in the United States. DOD land is mostly military bases and reservations. The largest single DOD-owned tract is the 2.3-million-acre White Sands Missile Range in New Mexico.
Together, the BLM, FWS, NPS, Forest Service, and DOD manage 97% of federal land. Federal agencies that control smaller amounts of land include the U.S. Army Corps of Engineers, the Bureau of Reclamation, the United States Postal Service, the National Aeronautics and Space Administration, and the U.S. Department of Energy.
Federal land is concentrated in Alaska and the Western United States. Nationwide, the federal government owns 27.4% of all land area. There are significant variations regionally; the federal government owns 61.3% of the land area in Alaska, 46.4% of the land area in the 11 contiguous Western states; and 4.2% of the land area of other states. The state with the highest percentage of land held by the federal government is Nevada (79.6%); the states with the lowest percentage of land held by the federal government are Connecticut and Iowa (0.3%).
From 1990 to 2015, federal acreage declined by about 3.9% due to a decline in land held by DOD and BLM.