St. Onge is a city located in South Dakota. St. Onge has a 2020 population of 122. St. Onge is currently declining at a rate of 0.00% annually and its population has decreased by -36.13% since the most recent census, which recorded a population of 191 in 2010. St. Onge reached it's highest population of 246 in 2011.
The average household income in St. Onge is - with a poverty rate of 0.00%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in St. Onge is 78.6 years, 0 years for males, and 0 years for females. For every 100 females there are 103.3 males.