Simi valley is located in Ventura county California with a geographic area of 41.5 square miles. The total population in Simi valley is 125,768 with 48.8% male and 51.2% female. Children under age 5 represent 5.4% of the population, under age 18 equal 21.0% of the population and over age 65 is 15.7% of the population. The median household income is $99,245, per capita income is $43,714. There are a total of 42,902 housing units with 71.5% owner occupied. Education includes 17.4% of residents that are high school graduates and 38.0% with a bachelor's degree or higher. The average temperature in Simi valley in the summer is 76 degrees, and in the winter 43 degrees.