St. John is a city located in Kansas. With a 2020 population of 1,166, it is the 175th largest city in Kansas and the 9709th largest city in the United States . St. John is currently declining at a rate of -0.43% annually and its population has decreased by -9.96% 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 600 people per square mile.
The average household income in St. John is $78,351 with a poverty rate of 13.43%. The median rental costs in recent years comes to $666 per month, and the median house value is $74,500. The median age in St. John is 39.2 years, 33.5 years for males, and 40.6 years for females.