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 Plumas National Forest is 4,451.542 square kilometers.
The area of Cleveland National Forest is 2,000,000.0 square meters.
The area of Modoc National Forest is 6,695.087 square kilometers.
The area of Chippewa National Forest is 6,474.97 square kilometers.
The area of Olympic National Forest is 2,564.4 square kilometers.
The area of Stanislaus National Forest is 3,634.478 square kilometers.
The area of Custer National Forest is 5,173.012 square kilometers.
The area of Umatilla National Forest is 7,284.342 square kilometers.
The area of Bitterroot National Forest is 6,422.644 square kilometers.