Marathon is located in MONROE COUNTY Florida with a geographic area of 8.4 square miles. The total population in Marathon is 8,746 with 53.2% male and 46.8% female. Children under age 5 represent 5.8% of the population, under age 18 equal 18.6% of the population and over age 65 is 21.5% of the population. The median household income is $56,008, per capita income is $39,699. There are a total of 3,879 housing units with 51.4% owner occupied. Education includes 23.1% of residents that are high school graduates and 34.2% with a bachelor's degree or higher. The average temperature in Marathon in the summer is 82 degrees, and in the winter 56 degrees.
