St. Marie is a city located in Montana. St. Marie has a 2020 population of 489. St. Marie is currently declining at a rate of 0.00% annually and its population has increased by 85.23% since the most recent census, which recorded a population of 264 in 2010. St. Marie reached it's highest population of 619 in 2015.
The average household income in St. Marie is $61,373 with a poverty rate of 23.72%. The median rental costs in recent years comes to $970 per month, and the median house value is $21,100. The median age in St. Marie is 46.1 years, 37.9 years for males, and 54.9 years for females. For every 100 females there are 107.2 males.