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, Puerto Rico to separate themselves from Toa Baja. On November 22, 1842, Jacinto López Martínez, the Sergeant at Arms for the ward of Dorado, petitioned the Spanish Governor of Puerto Rico, Santiago Méndez Vigo, to establish the municipality of Dorado. The governor authorized the founding of the town pending the construction of public works, including an administrative building and a church near the town square. In 1848, the construction of the public works were completed and López Martínez became the first mayor of Dorado. In 1902, four years after the Spanish–American War, Dorado was again appended to Toa Baja. However, in 1905