Layton is a city located on the island of Long Key in Monroe County, Florida, United States. The city is part of the Florida Keys. The population was 210 at the 2020 census. In the late 19th century, Long Key was used as a coconut plantation. By 1910, Layton was becoming famous as a fishing destination, thanks in part to promotion by sportswriter, Zane Grey. However, the developing tourist infrastructure on Long Key, including a station on the Overseas Railroad, was largely destroyed by the Labor Day Hurricane of 1935.