Mongaup valley is located in Sullivan county New york with a geographic area of 5.0 square miles. The total population in Mongaup valley is 689 with 38.0% male and 62.0% female. Children under age 5 represent 3.3% of the population, under age 18 equal 7.4% of the population and over age 65 is 44.3% of the population. The median household income is $56,705, per capita income is $20,596. There are a total of 222 housing units with 29.3% owner occupied. Education includes 20.3% of residents that are high school graduates and 0.0% with a bachelor's degree or higher. The average temperature in Mongaup valley in the summer is 70 degrees, and in the winter 27 degrees.