Justin is located in Denton county Texas with a geographic area of 3.3 square miles. The total population in Justin is 4,125 with 52.6% male and 47.4% female. Children under age 5 represent 3.0% of the population, under age 18 equal 18.9% of the population and over age 65 is 15.5% of the population. The median household income is $88,594, per capita income is $40,007. There are a total of 1,610 housing units with 87.7% owner occupied. Education includes 20.7% of residents that are high school graduates and 33.4% with a bachelor's degree or higher. The average temperature in Justin in the summer is 83 degrees, and in the winter 49 degrees.