Martinez is located in Contra costa county California with a geographic area of 12.6 square miles. The total population in Martinez is 38,397 with 48.8% male and 51.2% female. Children under age 5 represent 6.9% of the population, under age 18 equal 20.4% of the population and over age 65 is 16.4% of the population. The median household income is $109,994, per capita income is $51,847. There are a total of 14,853 housing units with 69.6% owner occupied. Education includes 14.1% of residents that are high school graduates and 46.9% with a bachelor's degree or higher. The average temperature in Martinez in the summer is 70 degrees, and in the winter 43 degrees.
