St. Ann is a city located in St. Louis County Missouri. With a 2020 population of 12,523, it is the 61st largest city in Missouri and the 2628th largest city in the United States . St. Ann is currently declining at a rate of -0.42% annually and its population has decreased by -3.82% since the most recent census, which recorded a population of 13,020 in 2010. St. Ann reached it's highest population of 18,215 in 1970. Spanning over 3 miles, St. Ann has a population density of 3,969 people per square mile.
The average household income in St. Ann is $51,131 with a poverty rate of 16.20%. The median rental costs in recent years comes to $794 per month, and the median house value is $89,900. The median age in St. Ann is 34.6 years, 32.9 years for males, and 36.6 years for females.