San Manuel is a census-designated place (CDP) in Pinal County, Arizona, United States. The population was 4,375 at the 2000 census. San Manuel was built in 1953 as a company town to serve the then-new San Manuel copper mine, mill and smelter complex. The mine and smelter were permanently closed in 2003. Nearby towns are Oracle, Arizona and Mammoth, Arizona. Both are within ten miles (16 km) of San Manuel and make up the tri-community area.