St. Johns CDP, AZ has a population of 726 and is the 17,241st largest city in the United States. The population density is 318 per sq mi which is 454% higher than the Arizona average and 251% higher than the national average. The median age in St. Johns CDP is 26 which is approximately 31% lower than the Arizona average of 37. In St. Johns CDP, 37% of the population over 15 years of age are married, 81% speak English and 2% speak Spanish. 95% of St. Johns CDP residents were born in Arizona, 5% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in St. Johns CDP is 454% higher than Arizona.
The median age in St. Johns CDP is 31% lower than Arizona.
In St. Johns CDP 1.52% of the population is White.
In St. Johns CDP 2.07% of the population is Black or African American.
In St. Johns CDP 0.00% of the population is Asian.