Upper brookville is located in Nassau county New york with a geographic area of 4.3 square miles. The total population in Upper brookville is 1,627 with 45.6% male and 54.4% female. Children under age 5 represent 1.7% of the population, under age 18 equal 16.8% of the population and over age 65 is 16.6% of the population. The median household income is $200,959, per capita income is $104,016. There are a total of 547 housing units with 87.0% owner occupied. Education includes 9.5% of residents that are high school graduates and 76.8% with a bachelor's degree or higher. The average temperature in Upper brookville in the summer is 70 degrees, and in the winter 27 degrees.