Mountain house is located in San joaquin county California with a geographic area of 4.6 square miles. The total population in Mountain house is 21,387 with 50.6% male and 49.4% female. Children under age 5 represent 8.1% of the population, under age 18 equal 34.4% of the population and over age 65 is 5.9% of the population. The median household income is $161,086, per capita income is $41,311. There are a total of 5,303 housing units with 71.7% owner occupied. Education includes 6.8% of residents that are high school graduates and 52.4% with a bachelor's degree or higher. The average temperature in Mountain house in the summer is 76 degrees, and in the winter 43 degrees.