Clarksville is located in Pike county Missouri with a geographic area of 0.6 square miles. The total population in Clarksville is 508 with 50.6% male and 49.4% female. Children under age 5 represent 5.1% of the population, under age 18 equal 27.4% of the population and over age 65 is 26.8% of the population. The median household income is $52,411, per capita income is $30,002. There are a total of 209 housing units with 70.8% owner occupied. Education includes 28.2% of residents that are high school graduates and 29.2% with a bachelor's degree or higher. The average temperature in Clarksville in the summer is 77 degrees, and in the winter 32 degrees.