The U.S. Forest Service, in the Department of Agriculture, had the earliest wilderness protection policies and its areas made up the original wilderness system established by the 1964 Wilderness Act. This is the gateway to pages on each national forest (found all over the country) and national grassland, with links to wilderness areas on that forest, and contact information for the key agency personnel, as well as for each forest management plan, the vehicle for considering recommendation of additional wilderness areas.
The Bureau of Land Management, in the Department of the Interior, was the final agency to join the wilderness program, as part of the 1976 Federal Land Policy and Management Act, and has the fewest acres designated. Links here to each State Office, and to the National Landscape Conservation System, with links to each wilderness areas and wilderness study areas, as well as to each resource management plan, which is the vehicle for recommending new wilderness areas.
The U.S. Fish and Wildlife Service, in the Department of the Interior, administers hundreds of wilderness areas nationwide, including huge areas in Alaska (notably the 9,000,000-acre wilderness in the Arctic National Wildlife Refuge, minus the controversial area proposed for oil and gas drilling, which will not occur, ever!) and many small islands and several vast ocean national monuments in the U.S. territorial waters in the Pacific southwest of Hawaii, which will have designated underwater wilderness areas one day. Links here to each wildlife refuge and to each wilderness area, as well as to each refuge conservation plan, the vehicle for recommending new wilderness areas.
The National Park Service, in the Department of the Interior, has the largest acreage of designated wilderness areas thanks to huge wilderness areas in large national parks, monuments, and preserves in Alaska, the California Desert, and the Everglades. Links here to each park system unit and to each wilderness area, as well as to each park management plan, the vehicle for considering designation of new wilderness areas.