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
Dorado is treated (like the adjacent asterism Argo Navis) as a feminine proper name of Greek origin ending in -ō (like "Io" or "Callisto" or "Argo"), which have a genitive ending "-ūs". Dorado was one of twelve constellations named by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman. It appeared: Dorado has been represented historically as a dolphinfish and a swordfish; the latter depiction is inaccurate. It has also been represented as a goldfish. The constellation was also known in the 17th and 18th century as Xiphias. The name "Dorado" ultimately become dominant and was adopted