Marianna is located in Washington county Pennsylvania with a geographic area of 2.0 square miles. The total population in Marianna is 531 with 53.7% male and 46.3% female. Children under age 5 represent 10.9% of the population, under age 18 equal 22.2% of the population and over age 65 is 9.4% of the population. The median household income is $55,288, per capita income is $25,091. There are a total of 195 housing units with 77.4% owner occupied. Education includes 50.3% of residents that are high school graduates and 1.0% with a bachelor's degree or higher. The average temperature in Marianna in the summer is 73 degrees, and in the winter 33 degrees.