Sebastian is located in Brevard county Florida with a geographic area of 15.8 square miles. The total population in Sebastian is 25,613 with 48.4% male and 51.6% female. Children under age 5 represent 3.5% of the population, under age 18 equal 14.4% of the population and over age 65 is 35.5% of the population. The median household income is $54,986, per capita income is $32,400. There are a total of 10,684 housing units with 82.5% owner occupied. Education includes 30.5% of residents that are high school graduates and 27.4% with a bachelor's degree or higher. The average temperature in Sebastian in the summer is 80 degrees, and in the winter 56 degrees.