Gallatin is located in Sumner county Tennessee with a geographic area of 32.2 square miles. The total population in Gallatin is 40,262 with 50.1% male and 49.9% female. Children under age 5 represent 6.1% of the population, under age 18 equal 23.1% of the population and over age 65 is 16.6% of the population. The median household income is $60,930, per capita income is $32,912. There are a total of 15,459 housing units with 60.4% owner occupied. Education includes 28.2% of residents that are high school graduates and 29.3% with a bachelor's degree or higher. The average temperature in Gallatin in the summer is 77 degrees, and in the winter 38 degrees.