It is often called just `` the Vineyard '' . With a land area of 87.48 square miles ( 231.75 kmÂ ) , Martha 's Vineyard is the 57th largest island in the United States . Often called just `` The Vineyard , '' the island has a land area of 87.48 square miles ( 231.75 kmÂ ) and is the 58th largest island in the United States , and the third largest on the East Coast of the United States .