Lower Klamath National Wildlife Refuge was created in 1908.
Upper Klamath National Wildlife Refuge was created in 1928.
Klamath Marsh National Wildlife Refuge was created in 1958.
Klamath Basin National Wildlife Refuge Complex was created in 1908.
The area of Upper Klamath National Wildlife Refuge is 69.578 square kilometers.
The area of Lower Klamath National Wildlife Refuge is 206.038 square kilometers.
The area of Klamath Basin National Wildlife Refuge Complex is 776.996 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.