Fairfax is located in Marin county California with a geographic area of 1.0 square miles. The total population in Fairfax is 1,778 with 45.7% male and 54.3% female. Children under age 5 represent 6.7% of the population, under age 18 equal 29.8% of the population and over age 65 is 7.5% of the population. The median household income is $68,047, per capita income is $20,419. There are a total of 401 housing units with 79.1% owner occupied. Education includes 27.7% of residents that are high school graduates and 6.2% with a bachelor's degree or higher. The average temperature in Fairfax in the summer is 76 degrees, and in the winter 43 degrees.