 As of the 2000 census, Montague did not have a permanent resident population, making it at that time the largest uninhabited island in the United States.Since then, the 2010 abandonment of the United States Coast Guard station on Attu Island in the Aleutian Islands, which at 892.8 km² (344.7 sq mi) is larger than Montague Island, causes Attu to claim that title.Montague Island was named by Captain James Cook in honor of John Montagu, 4th Earl of Sandwich, one of his greatest supporters.