Marathon is located in south Florida. Marathon is part of Monroe County. Marathon has 8.44 square miles of land area and 0.84 square miles of water area. As of 2010-2014, the total Marathon population is 8,529, which has shrunk 16.83% since 2000. The population growth rate is much lower than the state average rate of 21.14% and is much lower than the national average rate of 11.61%. Marathon median household income is $48,125 in 2010-2014 and has grown by 33.64% since 2000. The income growth rate is much higher than the state average rate of 21.62% and is higher than the national average rate of 27.36%. Marathon median house value is $309,500 in 2010-2014 and has grown by 39.10% since 2000. The house value growth rate is lower than the state average rate of 48.06% and is lower than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Marathon is better than the state average in quality. The Marathon area code is 305.