St. Johns is a city located in Arizona. With a 2020 population of 3,555, it is the 70th largest city in Arizona and the 5737th largest city in the United States. St. Johns is currently growing at a rate of 0.54% annually and its population has increased by 2.16% since the most recent census, which recorded a population of 3,480 in 2010. Spanning over 26 miles, St. Johns has a population density of 137 people per square mile.
The average household income in St. Johns is $60,945 with a poverty rate of 15.19%. The median rental costs in recent years comes to $523 per month, and the median house value is $88,700. The median age in St. Johns is 32.3 years, 32.9 years for males, and 30.9 years for females. For every 100 females there are 86.7 males.