About Ajo, Arizona
Ajo (pronounced /???ho?/ AH-hoh; O'odham: Moik Wahia or O'odham: ?O?oho) is a census-designated place (CDP) in Pima County, Arizona, United States. The population was 3,705 at the 2000 census. Ajo is located on State Route 85 just 43 miles (69 km) from the Mexican border. It is the closest community to Organ Pipe Cactus National Monument.