Fountain valley is located in Orange county California with a geographic area of 9.1 square miles. The total population in Fountain valley is 56,118 with 48.1% male and 51.9% female. Children under age 5 represent 4.7% of the population, under age 18 equal 19.5% of the population and over age 65 is 20.3% of the population. The median household income is $89,924, per capita income is $39,320. There are a total of 18,369 housing units with 67.7% owner occupied. Education includes 14.0% of residents that are high school graduates and 46.8% with a bachelor's degree or higher. The average temperature in Fountain valley in the summer is 72 degrees, and in the winter 43 degrees.