Marathon is a city in the middle of the Florida Keys, in Monroe County, Florida, United States. As of the 2020 census, the city had a population of 9,689, up from 8,297 in 2010. History Though the area has been settled for some time, Marathon is a relatively new city, incorporated in 1999. The name Marathon dates back to the origin of the Florida East Coast Railroad. The name came from the railroad workers who were working night and day to complete the railway; due to the unrelenting pace and struggle to complete the project, workers complained that "this is getting to be a real marathon", and the word was later used to name the local railroad station. The Keys historian Dan Gallager in his book Florida's Great Ocean Railway credits New York playwright Witter Bynner for naming Marathon. According to Gallager, J.R. Parrott, then Florida East Coast Railway's President and General Manager, invited Brynner to the Keys to "plot stations for the railroad". When asked to generate a name for the station at Key Vaca, Brynner proposed "Marathon", inspired by the following passage from Byron: "The mountains look on Marathon—and Marathon looks on the sea." Hurricane Irma Marathon experienced significant damage from the September 10, 2017, U.S. landfall of Hurricane Irma. One of the earliest casualties of the storm was a man who died in a school shelter. Marathon was one of the earliest spots in the Keys to receive transport of needed supplies to deal with the aftermath of Irma. The Air National Guard landed two C-130 transport planes every two hours beginning on the morning of September 11. Geography Marathon occupies a series of keys (islands) near the middle of the Florida Keys. Via U.S. Route 1, it is northeast of Key West and southwest of Key Largo. The city boundaries extend from the east end of the Seven Mile Bridge (Mile Marker 47) to the west end of Tom's Harbor Bridge (Mile Marker 61), excluding that portion of the area within the city limits of Key Colony Beach. Among the islands within the city limits are Boot Key, Knight's Key, Hog Key, Vaca Key, Stirrup Key, Crawl Key, Little Crawl Key, East and West Sister's Island, Deer Key, Fat Deer Key (excluding the portion in Key Colony Beach), Long Point Key, and Grassy Key. The Marathon Publix and the United States Post Office for Marathon (zipcode