Ajo, Arizona

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Ajo
Unincorporated community and census-designated place
Ajo plaza in 1990
Location in Pima County and the state of Arizona
Coordinates: 32°22′53″N 112°52′10″W / 32.38139°N 112.86944°W / 32.38139; -112.86944
Country	United States
State	Arizona
County	Pima
Area [1]
• Total	33.33 sq mi (86.32 km2)
• Land	33.33 sq mi (86.32 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation	1,759 ft (536 m)
Population  (2020)
• Total	3,039
• Density	91.19/sq mi (35.21/km2)
Time zone	UTC-7 (MST (no daylight saving time))
ZIP code	85321
Area code	520
FIPS code	04-00870
GNIS feature ID	0000538

Ajo (/ˈɑːhoʊ/ AH-hoh) is an unincorporated community in Pima County, Arizona, United States. It is the closest community to Organ Pipe Cactus National Monument. The population was 3,039 at the 2020 census. Ajo is located on State Route 85 just 43 miles (69 km) from the Mexican border.