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Janesville is a sparsely populated census-designated place in Lassen County, California, United States. It is located 11 miles (18 km) southeast of Susanville, at an elevation of 4239 feet. Janesville is located on the eastern slopes of the Sierra Nevada Mountain range. Its population is 2,461 as of the 2020 census, up from 1,408 from the 2010 census.