St. Ann is a city located in Missouri. With a 2020 population of 12,573, it is the 59th largest city in Missouri and the 2625th largest city in the United States. St. Ann is currently declining at a rate of -0.54% annually and its population has decreased by -3.43% 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 3,985 people per square mile.
The average household income in St. Ann is $52,173 with a poverty rate of 15.24%. The median rental costs in recent years comes to $797 per month, and the median house value is $87,800. The median age in St. Ann is 36.3 years, 34.6 years for males, and 39 years for females. For every 100 females there are 94.1 males.