Herndon is located in Fairfax county Virginia with a geographic area of 4.3 square miles. The total population in Herndon is 24,577 with 49.9% male and 50.1% female. Children under age 5 represent 7.6% of the population, under age 18 equal 23.8% of the population and over age 65 is 10.0% of the population. The median household income is $112,644, per capita income is $45,008. There are a total of 7,721 housing units with 63.3% owner occupied. Education includes 13.4% of residents that are high school graduates and 59.6% with a bachelor's degree or higher. The average temperature in Herndon in the summer is 71 degrees, and in the winter 35 degrees.
