Original: Often called just '' the Vineyard , '' the island has a land area of 87.48 square miles ( 231.75 km ² ) and is the 57th largest island in the United States , and the third largest on the East Coast of the United States .
Simplified: With a land area of 87.48 square miles ( 231.75 km ² ) , Martha 's Vineyard is the 57th largest island in the United States .