Bitter Lake National Wildlife Refuge was created in 1937.
Bitter Creek National Wildlife Refuge was created in 1985.
The area of Bitter Lake National Wildlife Refuge is 99.294 square kilometers.
The area of Bitter Creek National Wildlife Refuge is 57.049 square kilometers.
Emiquon National Wildlife Refuge was created in 2000.
Matlacha Pass National Wildlife Refuge was created on 1908-09-26.
Mark Twain National Wildlife Refuge Complex was created in 1958.
Desecheo National Wildlife Refuge was created in 1976.
Catahoula National Wildlife Refuge was created in 1958.
Tetlin National Wildlife Refuge was created in 1980.
Nisqually National Wildlife Refuge was created in 1974.
Toppenish National Wildlife Refuge was created in 1964.
Pahranagat National Wildlife Refuge was created in 1963.