Portsmouth is located in Rockingham county New hampshire with a geographic area of 15.7 square miles. The total population in Portsmouth is 21,418 with 48.3% male and 51.7% female. Children under age 5 represent 3.6% of the population, under age 18 equal 15.6% of the population and over age 65 is 19.4% of the population. The median household income is $78,712, per capita income is $54,967. There are a total of 10,097 housing units with 50.3% owner occupied. Education includes 15.1% of residents that are high school graduates and 62.6% with a bachelor's degree or higher. The average temperature in Portsmouth in the summer is 68 degrees, and in the winter 23 degrees.
