About Charter Oak, CACharter Oak is located in California. Charter Oak, California has a population of 9,279. Charter Oak is more family-centric than the surrounding county with 37% households with children. The county percentage for households with children is 31%. The median household income in Charter Oak, California is $55,986. The median household income for the surrounding county is $52,750 compared to the national median of $49,877. The median age of people living in Charter Oak is 37 years. Charter Oak WeatherThe average high temperature in July is 88.7 degrees, with an average low temperature in January of 41.5 degrees. The annual precipitation is 19. Charter Oak MapReal Estate Near Charter OakNearby CitiesNearby Cities Homes for Sale |