Mount sterling is located in Brown county Illinois with a geographic area of 1.1 square miles. The total population in Mount sterling is 2,220 with 51.6% male and 48.4% female. Children under age 5 represent 9.4% of the population, under age 18 equal 27.8% of the population and over age 65 is 14.2% of the population. The median household income is $45,536, per capita income is $24,433. There are a total of 956 housing units with 63.2% owner occupied. Education includes 35.3% of residents that are high school graduates and 17.2% with a bachelor's degree or higher. The average temperature in Mount sterling in the summer is 74 degrees, and in the winter 27 degrees.