Granite bay is located in Placer county California with a geographic area of 21.5 square miles. The total population in Granite bay is 22,818 with 48.5% male and 51.5% female. Children under age 5 represent 4.1% of the population, under age 18 equal 24.2% of the population and over age 65 is 18.4% of the population. The median household income is $170,504, per capita income is $75,439. There are a total of 7,885 housing units with 91.8% owner occupied. Education includes 9.4% of residents that are high school graduates and 60.2% with a bachelor's degree or higher. The average temperature in Granite bay in the summer is 76 degrees, and in the winter 43 degrees.