Hidden valley lake is located in Lake county California with a geographic area of 9.8 square miles. The total population in Hidden valley lake is 5,948 with 49.5% male and 50.5% female. Children under age 5 represent 3.0% of the population, under age 18 equal 23.3% of the population and over age 65 is 20.1% of the population. The median household income is $67,102, per capita income is $31,290. There are a total of 2,255 housing units with 72.0% owner occupied. Education includes 18.6% of residents that are high school graduates and 26.7% with a bachelor's degree or higher. The average temperature in Hidden valley lake in the summer is 76 degrees, and in the winter 43 degrees.