St. Johns is a census-designated place (CDP) in Maricopa County, Arizona, United States, located in the Gila River Indian Community. The population was 690 at the 2020 census, up from 476 at the 2010 census.
It is not in any school district. The K-8 tribal school Gila Crossing Community School, affiliated with the Bureau of Indian Education, is in nearby Komatke. ==Notes==