Washington grove is located in Montgomery county Maryland with a geographic area of 0.3 square miles. The total population in Washington grove is 710 with 51.4% male and 48.6% female. Children under age 5 represent 6.1% of the population, under age 18 equal 17.9% of the population and over age 65 is 21.5% of the population. The median household income is $127,917, per capita income is $59,586. There are a total of 283 housing units with 92.6% owner occupied. Education includes 8.5% of residents that are high school graduates and 78.1% with a bachelor's degree or higher. The average temperature in Washington grove in the summer is 74 degrees, and in the winter 37 degrees.