Summersville is located in Texas county Missouri with a geographic area of 1.1 square miles. The total population in Summersville is 367 with 44.7% male and 55.3% female. Children under age 5 represent 2.2% of the population, under age 18 equal 31.6% of the population and over age 65 is 21.3% of the population. The median household income is $24,306, per capita income is $27,791. There are a total of 153 housing units with 64.7% owner occupied. Education includes 45.1% of residents that are high school graduates and 15.0% with a bachelor's degree or higher. The average temperature in Summersville in the summer is 75 degrees, and in the winter 32 degrees.