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Susanville is the only incorporated city in Lassen County, California, United States, of which it is also the county seat. Susanville is located on the Susan River in the southern part of the county, at an elevation of 4,186 feet (1,276 m). Its population is 16,728 as of the 2020 census, down from 17,947 from the 2010 census.
Source: Wikipedia