Lassen County is a county in the northeastern portion of the U.S. state of California. As of the 2010 census, the population was 34,895. The county seat and only incorporated city is Susanville.
Lassen County comprises the Susanville, California, micropolitan statistical area. A former farming, mining and lumber area, its economy now depends on employment at two state and one federal prison; the former two in Susanville and the latter in Herlong. In 2007 half the adults in Susanville worked in one of the facilities
For more information on Lassen County Government, please contact the main administration office at (530) 251-8333.