They are located in 44 states (excepting Connecticut, Delaware, Iowa, Kansas, Maryland, and Rhode Island) and Puerto Rico.
The NPS has oversight of 43,890,500 acres (68,578.9 sq mi; 177,619 km2) of wilderness at 61 locations.
The FWS has responsibility for 20,702,350 acres (32,347.42 sq mi; 83,779.4 km2) in 71 areas.
BLM oversees 8,726,011 acres (13,634.392 sq mi; 35,312.91 km2) at 224 sites.
This table lists all U.S. areas that have been designated by the United States Congress under the Wilderness Act.