Selden is located in Suffolk county New york with a geographic area of 4.5 square miles. The total population in Selden is 21,338 with 49.2% male and 50.8% female. Children under age 5 represent 5.0% of the population, under age 18 equal 20.7% of the population and over age 65 is 15.9% of the population. The median household income is $93,262, per capita income is $34,616. There are a total of 6,790 housing units with 82.7% owner occupied. Education includes 32.9% of residents that are high school graduates and 27.8% with a bachelor's degree or higher. The average temperature in Selden in the summer is 70 degrees, and in the winter 27 degrees.
