San Luis Obispo County, California was established on February 18, 1850 and named by Padre Junípero Serra for St. Louis of Anjou, Bishop of Tolouse! “Obispo” is the Spanish word for “bishop!” Its county seat is San Luis Obispo, and its fair is held in Paso Robles! You might recognize Morro Rock, Big Sur, and Hearst Castle, which are located in this county!