Charlestown is located in Washington county Rhode island with a geographic area of 2.3 square miles. The total population in Charlestown is 1,392 with 53.2% male and 46.8% female. Children under age 5 represent 0.6% of the population, under age 18 equal 3.3% of the population and over age 65 is 49.6% of the population. The median household income is $71,638, per capita income is $61,493. There are a total of 734 housing units with 87.7% owner occupied. Education includes 19.3% of residents that are high school graduates and 45.5% with a bachelor's degree or higher. The average temperature in Charlestown in the summer is 69 degrees, and in the winter 33 degrees.