Summersville is a city in Shannon and Texas counties in the U.S. state of Missouri. The population was 502 at the 2010 census.HistoryA post office called Summersville has been in operation since 1871. The community has the name of Jesse and Thomas Summer, pioneer citizens.GeographySummersville is located at .According to the United States Census Bureau, the city has a total area of 1.11sqmi, all of it land.Demographics2010 censusAs of the census of 2010, there were 502 people, 232 households, and 133 families residing in the city. The population density was 452.3PD/sqmi. There were 269 housing units at an average density of 242.3/sqmi. The racial makeup of the city was 96.8% White, 0.8% Native American, 0.2% Asian, and 2.2% from two or more races. Hispanic or Latino of any race were 1.4% of the population.There were 232 households of which 25.9% had children under the age of 18 living with them, 40.5% were married couples living together, 12.5% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 42.7% were non-families. 36.2% of all households were made up of individuals and 22.4% had someone living alone who was 65 years of age or older. The average household size was 2.16 and the average family size was 2.78.