Princeton is located in Mercer county New jersey with a geographic area of 17.9 square miles. The total population in Princeton is 31,161 with 49.7% male and 50.3% female. Children under age 5 represent 3.0% of the population, under age 18 equal 19.2% of the population and over age 65 is 15.7% of the population. The median household income is $146,127, per capita income is $75,705. There are a total of 9,806 housing units with 56.4% owner occupied. Education includes 5.3% of residents that are high school graduates and 84.6% with a bachelor's degree or higher. The average temperature in Princeton in the summer is degrees, and in the winter degrees.
