Marathon is a city spread over Knight's Key, Boot Key, Key Vaca, Fat Deer Key, Long Point Key, Crawl Key and Grassy Key islands in the middle of the Florida Keys, in Monroe County, Florida, United States. Marathon is a city in the Florida Keys. It's set on 13 islands, known for their beaches and barrier reef. Loggerhead turtles nest at Coco Plum Beach and Sombrero Beach. Curry Hammock State Park has a sandy shoreline and mangrove creek. The Dolphin Research Center offers interactive demos in a shallow lagoon. Near the City Marina, Crane Point features a tropical forest, bird-rescue center and natural history museum. As of the 2010 census, the city had a total population of 8,297. As of 2019, the population estimated by the U.S. Census Bureau was 8,581. The median income for a household in the city was $36,010. VISIT OFFICIAL CITY SITE https://www.ci.marathon.fl.us
