Mount vernon is located in Davison county South dakota with a geographic area of 0.3 square miles. The total population in Mount vernon is 500 with 56.4% male and 43.6% female. Children under age 5 represent 8.2% of the population, under age 18 equal 24.8% of the population and over age 65 is 9.2% of the population. The median household income is $46,250, per capita income is $28,032. There are a total of 248 housing units with 56.5% owner occupied. Education includes 53.2% of residents that are high school graduates and 12.5% with a bachelor's degree or higher. The average temperature in Mount vernon in the summer is 72 degrees, and in the winter 15 degrees.