Lassen County is a county located in the northeastern portion of the U.S. State of California. As of the 2020 census, the population was 32,730. 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 one federal and two state prisons; the former in Herlong and the latter two in Susanville. In 2007, half the adults in Susanville worked in one of the facilities.

Great property in the heart of Susanville community! According to the U.S. Census Bureau, the county has a total area of 4,720 square miles (12,200 km), of which 4,541 square miles (11,760 km) is land and 179 square miles (460 km) (3.8%) is water. Part of Lassen Volcanic National Park extends onto a western corner of the county.

Lassen County is abundantly rich in natural settings with year-round recreational activities. Lassen County enjoys a clean natural environment with excellent air quality. Its rural communities are ideal for raising families with less crime, traffic, and lower cost of living. Beautiful Eagle Lake is just a short distance away!