About San Andreas
San Andreas is an unincorporated census-designated place in, and the county seat of, Calaveras County, California, United States. The population was 2,994 at the 2020 census, up from 2,783 at the 2010 census. Like most towns in the region, it was founded during the California Gold Rush. The town is located on State Route 49 and is registered as California Historical Landmark #252.
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