Gayville is located in Yankton county South dakota with a geographic area of 0.2 square miles. The total population in Gayville is 374 with 51.1% male and 48.9% female. Children under age 5 represent 5.6% of the population, under age 18 equal 20.9% of the population and over age 65 is 23.0% of the population. The median household income is $64,750, per capita income is $30,677. There are a total of 189 housing units with 84.1% owner occupied. Education includes 37.0% of residents that are high school graduates and 18.0% with a bachelor's degree or higher. The average temperature in Gayville in the summer is 70 degrees, and in the winter 15 degrees.