Mount Vernon is a city located in South Dakota. With a 2020 population of 422, it is the 133rd largest city in South Dakota and the 14057th largest city in the United States. Mount Vernon is currently declining at a rate of -2.09% annually and its population has decreased by -8.66% since the most recent census, which recorded a population of 462 in 2010. Mount Vernon reached it's highest population of 467 in 2012. Spanning over 0 miles, Mount Vernon has a population density of 1,213 people per square mile.
The average household income in Mount Vernon is $67,384 with a poverty rate of 18.37%. The median rental costs in recent years comes to $660 per month, and the median house value is $100,600. The median age in Mount Vernon is 32.5 years, 28.9 years for males, and 35 years for females. For every 100 females there are 110.4 males.