Hillsborough is located in Somerset county New jersey with a geographic area of 8.0 square miles. The total population in Hillsborough is 20,539 with 49.4% male and 50.6% female. Children under age 5 represent 5.3% of the population, under age 18 equal 22.1% of the population and over age 65 is 11.5% of the population. The median household income is $126,765, per capita income is $56,275. There are a total of 7,874 housing units with 83.9% owner occupied. Education includes 17.5% of residents that are high school graduates and 60.6% with a bachelor's degree or higher. The average temperature in Hillsborough in the summer is 73 degrees, and in the winter 34 degrees.
