Water mill is located in Suffolk county New york with a geographic area of 10.6 square miles. The total population in Water mill is 1,860 with 44.9% male and 55.1% female. Children under age 5 represent 2.6% of the population, under age 18 equal 12.8% of the population and over age 65 is 26.7% of the population. The median household income is $170,139, per capita income is $138,103. There are a total of 891 housing units with 93.8% owner occupied. Education includes 20.0% of residents that are high school graduates and 74.5% with a bachelor's degree or higher. The average temperature in Water mill in the summer is 70 degrees, and in the winter 27 degrees.
