Walnut creek is located in Contra costa county California with a geographic area of 19.8 square miles. The total population in Walnut creek is 69,836 with 47.2% male and 52.8% female. Children under age 5 represent 4.8% of the population, under age 18 equal 15.6% of the population and over age 65 is 30.4% of the population. The median household income is $108,689, per capita income is $69,894. There are a total of 32,163 housing units with 63.9% owner occupied. Education includes 6.5% of residents that are high school graduates and 71.4% with a bachelor's degree or higher. The average temperature in Walnut creek in the summer is 70 degrees, and in the winter 43 degrees.
