Williamsville is located in Wayne county Missouri with a geographic area of 0.3 square miles. The total population in Williamsville is 336 with 47.6% male and 52.4% female. Children under age 5 represent 2.4% of the population, under age 18 equal 13.7% of the population and over age 65 is 20.2% of the population. The median household income is $40,250, per capita income is $21,093. There are a total of 151 housing units with 62.9% owner occupied. Education includes 41.1% of residents that are high school graduates and 5.3% with a bachelor's degree or higher. The average temperature in Williamsville in the summer is 77 degrees, and in the winter 32 degrees.