Lassen County California Cities/Towns - Doyle, Herlong, Janesville, Madeline, Milford, Termo, Susanville (County Seat), Westwood
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Lassen County is a county located in the U.S. state of California. As of 2016 the population was 30,870. The county seat is Susanville.
Lassen County was formed on April 1, 1864. The county was named after Peter Lassen, along with Mount Lassen, which is actually in neighboring Shasta County. Lassen was one of General John C. Fremont's guides, and a famous trapper, frontiersman and Indian fighter. He was murdered under mysterious circumstances near the Black Rock Desert in 1859, and his murder was never solved.