Calaveras County, officially the County of Calaveras, is a county located in the Gold Country of the U.S. state of California. Calaveras is the Spanish word for skulls; the county was reportedly named for the remains of Native Americans discovered by the Spanish explorer Captain Gabriel Moraga. As of the 2010 census, the county had a population of 45,578. The county seat is San Andreas. Angels Camp is the only incorporated city.