There are 155 national forests in the U.S. The two largest are located in the biggest state, Alaska. Tongass National Forest is about the size of West Virginia. Here are the largest forests.
1. Tongass National Forest, Sitka, Alaska, 25,913 square miles
2. Chugach National Forest, Anchorage, Alaska, 8,433
3. Toiyabe National Forest, Sparks, Nevada, 5,051
4. Tonto National Forest, Phoenix, Arizona, 4,489
5. Gila National Forest, Silver City, New Mexico, 4,232
Source: Land Areas of the National Forest System