The sign at the front entrance to Windley Key Fossil Reef Geological State Park
|Location||Gulf of Mexico|
All of the key is within the Village of Islamorada as of November 4, 1997, when it was incorporated.
A Florida State Park Service geological site, and the popular Holiday Isle resort are also on the island.
Prior to the building of the Overseas Railroad, there were two separate islands there, known as the Umbrella Keys. Railway construction involved filling between these two keys which then became known as Windley Key, after a settler. This is the site of several extensive quarries which for many years supplied building stone, known locally as keystone. The railway station on Windley Key was known as Quarry.