How many counties are there on the Island where the 2009 United States Open Championship was held ?
2009 U.S. Open (golf): The 2009 United States Open Championship was the 109th U.S. Open, held June 18–22 on the Black Course of Bethpage State Park on Long Island, in Farmingdale, New York. Long Island:  The island comprises four counties in the U.S. state of New York: Kings and Queens (which comprise the New York City boroughs of Brooklyn and Queens, respectively) to the west; and Nassau and Suffolk to the east.
four