Clarksville is located in Howard county Maryland with a geographic area of square miles. The total population in Clarksville is 71,944 with 49.9% male and 50.1% female. Children under age 5 represent 4.1% of the population, under age 18 equal 21.4% of the population and over age 65 is 16.0% of the population. The median household income is $136,002, per capita income is $64,069. There are a total of 26,985 housing units with 72.3% owner occupied. Education includes 8.0% of residents that are high school graduates and 75.1% with a bachelor's degree or higher. The average temperature in Clarksville in the summer is 73 degrees, and in the winter 34 degrees.