Red oak is located in Ellis county Texas with a geographic area of 15.4 square miles. The total population in Red oak is 13,010 with 47.9% male and 52.1% female. Children under age 5 represent 6.4% of the population, under age 18 equal 31.1% of the population and over age 65 is 8.5% of the population. The median household income is $78,646, per capita income is $31,860. There are a total of 4,098 housing units with 68.7% owner occupied. Education includes 25.2% of residents that are high school graduates and 29.4% with a bachelor's degree or higher. The average temperature in Red oak in the summer is 83 degrees, and in the winter 49 degrees.