Oracle is a census-designated place (CDP) in Pinal County, Arizona, United States. The population was 3,686 at the 2010 census.Buffalo Bill Cody owned a mine in Oracle briefly and, in 1911, appeared as "Santa" for a group of local children. The community is the location of the Biosphere 2 experiment. Oracle was also the postal address for environmentalist author Edward Abbey, who never lived in the town but visited often.