El Dorado County, officially the County of El Dorado, is a county located in the U.S. state of California. As of the 2010 census, the population was 181,058.[3] The county seat is Placerville. El Dorado County is included in the Sacramento-Roseville-Arden-Arcade, CA Metropolitan Statistical Area. It is located in the historic Gold Country in the Sierra Nevada. * Placerville Sports