Deer park is located in Suffolk county New york with a geographic area of 6.2 square miles. The total population in Deer park is 26,043 with 47.5% male and 52.5% female. Children under age 5 represent 5.1% of the population, under age 18 equal 20.6% of the population and over age 65 is 15.0% of the population. The median household income is $106,111, per capita income is $40,956. There are a total of 8,522 housing units with 84.5% owner occupied. Education includes 26.1% of residents that are high school graduates and 38.8% with a bachelor's degree or higher. The average temperature in Deer park in the summer is 70 degrees, and in the winter 27 degrees.