Maui is the second largest of the Hawaiian Islands , in the United States . The island of Maui ( in English , in Hawaiian ) is the second-largest of the Hawaiian Islands at 727.2 square miles ( 1883.5 km2 ) and is the 17th largest island in the United States . Maui is part of the state of Hawaii and is the largest of Maui County 's four islands , bigger than LÄ nai , Kahoolawe , and Molokai .