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- Modoc County
- Western Nevada
- Sierra County - Located in the mountains and forests adjacent to the Nevada border, Lassen County's southern neighbor was a booming mining area during the Gold Rush, but today is home to only about 3,000 people. Historically the county was the site of several massive gold discoveries, including the 106 pound Monumental Nugget in 1869; a replica of the huge nugget can be seen in the Kentucky Mine Museum in Sierra City.
- Plumas County
- Shasta County