The area of Lassen National Forest is 4,331.528 square kilometers.
Lassen National Forest was created on 1905-06-02.
The area of Lassen Volcanic National Park is 430.796 square kilometers.
Lassen Peak National Monument was created in 1907.
The area of Sawtooth National Forest is 8,498.398 square kilometers.
The area of Gallatin National Forest is 8,498.398 square kilometers.
The area of Croatan National Forest is 647.036 square kilometers.
The area of Malheur National Forest is 6,879.656 square kilometers.
The area of Umatilla National Forest is 7,284.342 square kilometers.
The area of Custer National Forest is 5,173.012 square kilometers.
The area of Inyo National Forest is 24,281.1385344 square meters.
The area of Siuslaw National Forest is 2,549.52 square kilometers.
The area of Stanislaus National Forest is 3,634.478 square kilometers.