Princeton is located in Collin county Texas with a geographic area of 10.1 square miles. The total population in Princeton is 12,208 with 49.6% male and 50.4% female. Children under age 5 represent 5.7% of the population, under age 18 equal 28.3% of the population and over age 65 is 6.6% of the population. The median household income is $80,323, per capita income is $30,792. There are a total of 4,069 housing units with 74.9% owner occupied. Education includes 26.4% of residents that are high school graduates and 27.9% with a bachelor's degree or higher. The average temperature in Princeton in the summer is 83 degrees, and in the winter 49 degrees.