Rossmoor is located in Orange county California with a geographic area of 1.6 square miles. The total population in Rossmoor is 11,923 with 49.7% male and 50.3% female. Children under age 5 represent 3.7% of the population, under age 18 equal 23.9% of the population and over age 65 is 20.8% of the population. The median household income is $138,641, per capita income is $59,380. There are a total of 4,077 housing units with 86.3% owner occupied. Education includes 11.4% of residents that are high school graduates and 66.8% with a bachelor's degree or higher. The average temperature in Rossmoor in the summer is 76 degrees, and in the winter 43 degrees.