Castalian springs is located in Sumner county Tennessee with a geographic area of 5.8 square miles. The total population in Castalian springs is 397 with 46.9% male and 53.1% female. Children under age 5 represent 6.3% of the population, under age 18 equal 22.2% of the population and over age 65 is 16.4% of the population. The median household income is $105,648, per capita income is $37,100. There are a total of 156 housing units with 84.6% owner occupied. Education includes 40.4% of residents that are high school graduates and 25.0% with a bachelor's degree or higher. The average temperature in Castalian springs in the summer is 77 degrees, and in the winter 38 degrees.