St. John is a city located in Washington. With a 2020 population of 576, it is the 231st largest city in Washington and the 12714th largest city in the United States. St. John is currently growing at a rate of 1.05% annually and its population has increased by 7.26% since the most recent census, which recorded a population of 537 in 2010. Spanning over 1 miles, St. John has a population density of 859 people per square mile.
The average household income in St. John is $52,050 with a poverty rate of 11.46%. The median rental costs in recent years comes to $633 per month, and the median house value is $129,300. The median age in St. John is 52.7 years, 55.3 years for males, and 45.5 years for females. For every 100 females there are 80.0 males.