St. John is a city located in Kansas. With a 2020 population of 1,190, it is the 172nd largest city in Kansas and the 9620th largest city in the United States. St. John is currently growing at a rate of 0.08% annually but its population has decreased by -8.11% since the most recent census, which recorded a population of 1,295 in 2010. St. John reached it's highest population of 1,292 in 2010. Spanning over 2 miles, St. John has a population density of 612 people per square mile.
The average household income in St. John is $74,746 with a poverty rate of 11.27%. The median rental costs in recent years comes to $663 per month, and the median house value is $67,400. The median age in St. John is 42.6 years, 41.4 years for males, and 44.8 years for females. For every 100 females there are 99.5 males.