Greenport Supermarket Owner: Charles Reichert Opened: unknown Cooperative: IGA Location: 101 South St, Greenport, NY Photographed: November 2016 Contributor: Anita C. This former A&P centennial comes to us courtesy of our contributor Anita C.! Greenport is way east, at the far eastern end of the north fork of Long Island. It's a small town with only one supermarket, and this store has been expanded from its original 8,000 square feet to just over 14,000 square feet.