Lake St. Louis is a city located in Missouri. With a 2020 population of 16,636, it is the 46th largest city in Missouri and the 2142nd largest city in the United States. Lake St. Louis is currently growing at a rate of 1.24% annually and its population has increased by 14.38% since the most recent census, which recorded a population of 14,545 in 2010. Spanning over 9 miles, Lake St. Louis has a population density of 1,949 people per square mile.
The average household income in Lake St. Louis is $110,651 with a poverty rate of 3.92%. The median rental costs in recent years comes to $1,047 per month, and the median house value is $268,500. The median age in Lake St. Louis is 43.9 years, 42.3 years for males, and 45.3 years for females. For every 100 females there are 106.9 males.