Sierra is one of the 58 counties in the state of California. It was created in 1852 from part of Yuba county. As of the 2010 census, the population was 3,240. The county seat is Downieville. The county has 2,490 square miles in area.
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Sierra is one of the 58 counties in the state of California. It was created in 1852 from part of Yuba county. As of the 2010 census, the population was 3,240. The county seat is Downieville. The county has 2,490 square miles in area.