The Town of Oyster Bay is easternmost of the three towns in Nassau County, New York, in the United States. Part of the New York metropolitan area, it is the only town in Nassau County that extends from the North Shore to the South Shore of Long Island. As of the 2010 census, the town population was 293,214.There are 18 villages and 18 hamlets within the town of Oyster Bay. The U.S. Postal Service has organized these 36 places into 30 different 5-digit ZIP codes served by 20 different post offices. Each post office has the same name as a hamlet or village, but their boundaries seldom correlate.Oyster Bay is also the name of a hamlet on the north shore, within the town of Oyster Bay. Near this hamlet, in the village of Cove Neck, is Sagamore Hill, the former residence and summer White House of Theodore Roosevelt and now a museum.