Gardendale is located in Jefferson county Alabama with a geographic area of 23.0 square miles. The total population in Gardendale is 14,021 with 47.3% male and 52.7% female. Children under age 5 represent 9.5% of the population, under age 18 equal 26.2% of the population and over age 65 is 16.1% of the population. The median household income is $75,170, per capita income is $35,508. There are a total of 5,374 housing units with 79.8% owner occupied. Education includes 28.0% of residents that are high school graduates and 34.9% with a bachelor's degree or higher. The average temperature in Gardendale in the summer is 79 degrees, and in the winter 43 degrees.