Houston is located in HARRIS COUNTY Texas with a geographic area of 640.4 square miles. The total population in Houston is 2,313,238 with 49.8% male and 50.2% female. Children under age 5 represent 7.5% of the population, under age 18 equal 24.7% of the population and over age 65 is 11.0% of the population. The median household income is $53,600, per capita income is $33,626. There are a total of 874,827 housing units with 42.9% owner occupied. Education includes 19.6% of residents that are high school graduates and 38.3% with a bachelor's degree or higher. The average temperature in Houston in the summer is 83 degrees, and in the winter 49 degrees.