St. Charles is a city located in Missouri. With a 2020 population of 72,750, it is the 9th largest city in Missouri and the 504th largest city in the United States. St. Charles is currently growing at a rate of 1.38% annually and its population has increased by 10.57% since the most recent census, which recorded a population of 65,794 in 2010. Spanning over 25 miles, St. Charles has a population density of 2,931 people per square mile.
The average household income in St. Charles is $83,072 with a poverty rate of 9.31%. The median rental costs in recent years comes to $959 per month, and the median house value is $188,600. The median age in St. Charles is 36.3 years, 35.6 years for males, and 36.9 years for females. For every 100 females there are 91.8 males.