St. Marys is a city located in Georgia. With a 2020 population of 19,361, it is the 54th largest city in Georgia and the 1910th largest city in the United States . St. Marys is currently growing at a rate of 2.09% annually and its population has increased by 13.08% since the most recent census, which recorded a population of 17,121 in 2010. St. Marys reached it's highest population of 19,361 in 2021. Spanning over 25 miles, St. Marys has a population density of 848 people per square mile.
The average household income in St. Marys is $74,556 with a poverty rate of 16.07%. The median rental costs in recent years comes to $1,025 per month, and the median house value is $182,400. The median age in St. Marys is 34.5 years, 30.9 years for males, and 37 years for females.