Upper Sugarloaf Key is located in the Florida Keys. It located between MM20.5-MM19 and bridge number 28/29 at Bow Channel/Park Key. U.S. 1 crosses the key at approximately mile markers 19–20.5. Upper
One of the rare stoplights in the lower Keys Overseas Highway, at Crane Blvd, is on Upper Sugarloaf Key. Crane Boulevard, leads to Sugarloaf Elementary school and Sugarloaf Middle School, residential area of the island and the Great White Heron National Wildlife Refuge with an excellent bicycling trail.