Florida's coast is longer than Hawaii's.
Florida . A peninsula between the Gulf of Mexico , the Atlantic Ocean , and the Straits of Florida , it has the longest coastline in the contiguous United States , approximately 1350 mi , and is the only state that borders both the Gulf of Mexico and the Atlantic Ocean . Hawaii . The state 's coastline is about 750 mi long , the fourth longest in the U.S. after the coastlines of Alaska , Florida , and California .