Winchester is located in Scott county Illinois with a geographic area of 1.1 square miles. The total population in Winchester is 1,717 with 48.6% male and 51.4% female. Children under age 5 represent 7.3% of the population, under age 18 equal 24.3% of the population and over age 65 is 15.4% of the population. The median household income is $52,500, per capita income is $27,445. There are a total of 670 housing units with 76.1% owner occupied. Education includes 44.0% of residents that are high school graduates and 33.3% with a bachelor's degree or higher. The average temperature in Winchester in the summer is 74 degrees, and in the winter 27 degrees.