El Dorado County, California along with the population since the 1960 Winter Olympics, hosted at Squaw Valley Ski Resort in neighboring Placer County. The present-day site of El Dorado County was once home to the Maidu, Washoe, and Miwok Native American tribes, and is notable for being the site of the 1848 gold discovery that sparked the California Gold Rush. The County of El Dorado was one of California's original 27 counties created effective February 18, 1850 (the number has risen to 58 today). Its name is derived from the Spanish meaning "the gilded/golden". The final segments of the Pony Express mail route ran
El Dorado County, California through El Dorado County until its replacement with the telegraph service in 1861; U.S. Highway 50 follows the Pony Express route today. The "Placerville Mountain Democrat", California's oldest surviving newspaper, serves El Dorado County. The El Dorado County Sheriff provides court protection, county jail administration, and coroner service for all of the county and provides patrol and detective services for the unincorporated areas of the county. Placerville, population 11,000, has a municipal police department, as does South Lake Tahoe, population 22,000. According to the U.S. Census Bureau, the county has a total area of , of which is land and