is a city on Knight's
Key, Boot Key, Key Vaca, Fat
Deer Key, Long Point Key, Crawl
Key and Grassy Key islands in the middle Florida Keys, in Monroe County, Florida, in the United States.
Boot Key Harbor is a natural body of water between Boot Key and Key Vaca, entirely within the Marathon city limits.
The name Marathon dates back to the origin of the Florida East
Coast Railroad. The name came about by the railroad workers who were working night and day to complete the railway - due to the unrelenting pace and struggle to complete the project, many of the workers complained that "this [the project] is getting to be a real Marathon", and was later used to name the local station along the railroad.