Lower Sugarloaf Key

U.S. 1 (or the Overseas Highway) crosses the key at about mile markers 16.5–17.5.

Due to the routing of U.S. Route 1, it appears that Upper Sugarloaf Key and Lower Sugarloaf Key are separate islands, but they are actually one large U-shaped island.

The island makes a loop on the Atlantic side with Upper Sugarloaf Sound and Park Key in the center.

It has Sugarloaf Lodge and restaurant, an airport and a volunteer fire department.

The Sugarloaf Key Bat Tower was built in 1929 and is listed as a historic site.