Harriman is located in Roane county Tennessee with a geographic area of 10.5 square miles. The total population in Harriman is 6,144 with 50.2% male and 49.8% female. Children under age 5 represent 6.4% of the population, under age 18 equal 18.4% of the population and over age 65 is 17.1% of the population. The median household income is $36,487, per capita income is $26,496. There are a total of 2,710 housing units with 60.0% owner occupied. Education includes 42.5% of residents that are high school graduates and 14.5% with a bachelor's degree or higher. The average temperature in Harriman in the summer is 77 degrees, and in the winter 38 degrees.