St. Charles is a city located in St. Charles County Missouri. With a 2020 population of 71,470, it is the 9th largest city in Missouri and the 519th largest city in the United States . St. Charles is currently growing at a rate of 0.31% annually and its population has increased by 8.63% since the most recent census, which recorded a population of 65,794 in 2010. St. Charles reached it's highest population of 71,470 in 2021. Spanning over 25 miles, St. Charles has a population density of 2,880 people per square mile.
The average household income in St. Charles is $88,004 with a poverty rate of 8.14%. The median rental costs in recent years comes to $985 per month, and the median house value is $200,400. The median age in St. Charles is 36.9 years, 37 years for males, and 36.9 years for females.