St. Mary's is a city located in Colorado. St. Mary's has a 2020 population of 516. St. Mary's is currently declining at a rate of 0.00% annually and its population has increased by 82.33% since the most recent census, which recorded a population of 283 in 2010. St. Mary's reached it's highest population of 516 in 2018.
The average household income in St. Mary's is $83,370 with a poverty rate of 0.00%. The median rental costs in recent years comes to - per month, and the median house value is $228,100. The median age in St. Mary's is 38.7 years, 38.4 years for males, and 43.7 years for females. For every 100 females there are 133.5 males.