St Barths Rent a car in St Barths. Cheap car rentals deals. Economy Rent-a-car A popular destination during Winter season - especially Christmas and New Year's Eve, - Saint Barth is an island small in territory (just under 10 square miles) but rich in superficial reefs and gorgeous beaches. With a population of barely 8900 people, Saint Barth is located in the Caribbean Sea, in the Guadalupe Archipelago, near Puerto Rico. Get caught by all the emotions that Saint Barth has waiting for you, along with the great vehicles at excellent prices that Economy Rent a Car offers.