Question: How many counties are there on the Island where the 2009 United States Open Championship was held ?

Context paragraphs:
2008 U.S. Open (golf): The 2008 United States Open Championship was the 108th U.S. Open, played June 12–16 at Torrey Pines in La Jolla, California, north of San Diego.  Tiger Woods won his third U.S. Open championship and 14th major title by beating Rocco Mediate on the first hole of sudden-death playoff following an 18-hole playoff.  With this victory, Woods joined Jack Nicklaus as the only two in golf history to win the career grand slam three times.  The U.S. Open was held at the Torrey Pines for the first time, and took place on the South Course.

Long Island: The Long Island is a large, densely-populated island off the East Coast of the United States, beginning at New York Harbor just 0.35 miles (0.56 km) from Manhattan Island and extending eastward into the Atlantic Ocean.  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.  However, many people in the New York metropolitan area (even those living in Brooklyn and Queens) colloquially use the term "Long Island" (or "The Island") exclusively to refer to the Nassau–Suffolk county area collectively, which is mainly suburban in character.  The majority of New York City residents now live on Long Island.

Flags of counties of the United States: The flags of the counties of the United States of America exhibit a wide variety of regional influences and local histories, as well as widely different styles and design principles.  For example, some Floridian and Alabamian municipality flags feature a saltire, due to saltires being used on their state flags.  Some Maryland county flags feature the coat of arms of the Calvert family, as it is featured on the Maryland state flag, and due to the Calvert family's prominence in Maryland history.  Many counties went decades without a flag, until a certain event, such as a local sesquicentennial or the American bicentennial, spurred the creation of a flag.  Frederick County, Maryland is one example, in 1976, it hosted a contest, asking the public to submit their designs to a commission.  A panel then reviewed the five winning entries, choosing one to become the official county flag.  Frederick County's example is typical of the flag adoption processes that many counties undertook with their flags.  The 250th anniversary of Augusta County, Virginia's founding also spurred the creation of a flag, in 1988.  Some flags, such as the flags of Montgomery County, Maryland, and Loudoun County, Virginia, were created by foreign entities, such as the College of Arms in the United Kingdom.

2010 U.S. Open (golf): The 2010 United States Open Championship was the 110th U.S. Open, held June 17–20 in Pebble Beach, California.  Graeme McDowell of Northern Ireland won his first major title, one stroke ahead of runner-up Grégory Havret of France.  McDowell was the first European to win the U.S. Open in forty years, since Tony Jacklin of England won in 1970, which started a period in which four out of five U.S. Open champions between 2010-14 were European.  This was the fifth U.S. Open to be played at Pebble Beach Golf Links (it also hosted in 2000, 1992, 1982, and 1972).

2001 U.S. Open (golf): The 2001 United States Open Championship was the 101st U.S. Open, held June 14–18 at Southern Hills Country Club in Tulsa, Oklahoma.  The U.S. Open returned to Southern Hills for the first time since 1977.  Retief Goosen won the first of his two U.S. Open titles in an 18-hole Monday playoff, two strokes ahead of runner-up Mark Brooks.  The tournament was also notable for ending defending champion Tiger Woods's run of four consecutive major championship wins, the "Tiger Slam"; Woods finished seven strokes back in a tie for twelfth.  He reclaimed the U.S. Open title the following year, and won the PGA Championship at Southern Hills in 2007.

2003 U.S. Open (golf): The 2003 United States Open Championship was the 103rd U.S. Open, held June 12–15 at the North Course of Olympia Fields Country Club in Olympia Fields, Illinois, a suburb south of Chicago.  Jim Furyk won his only major championship, three shots ahead of runner-up Stephen Leaney.  With a total score of 272, Furyk tied the record for the lowest 72-hole score in U.S. Open history, also achieved in 2000 and 1980 (and since lowered to 268 in 2011).  Another record was equalled by Vijay Singh, who tied Neal Lancaster's 9-hole record of 29 on the back nine of his second round.

U.S. Open (golf): The United States Open Championship, commonly known as the U.S. Open, is the annual open national championship of golf in the United States.  It is the second of the four major championships in golf, and is on the official schedule of both the PGA Tour and the European Tour.  It is staged by the United States Golf Association (USGA) in mid-June, scheduled so that, if there are no weather delays, the final round is played on the third Sunday, which is Father's Day.  The U.S. Open is staged at a variety of courses, set up in such a way that scoring is very difficult, with a premium placed on accurate driving.

2002 U.S. Open (golf): The 2002 United States Open Championship was the 102nd U.S. Open, held June 13–16 at the Black Course of Bethpage State Park in Farmingdale, New York, east of New York City on Long Island.  This was the first U.S. Open played on a public course.  Tiger Woods was the champion at 277 (−3), three shots ahead of runner-up Phil Mickelson.  It was Woods' second U.S. Open victory and eighth major championship win of his career.

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.  Lucas Glover won his only major title, two strokes ahead of runners-up Ricky Barnes, David Duval, and Phil Mickelson.

2000 U.S. Open (golf): The 2000 United States Open Championship was the 100th U.S. Open Championship, held June 15–18 at Pebble Beach Golf Links in Pebble Beach, California.  Tiger Woods won his first U.S. Open by a record-setting fifteen strokes over runners-up Ernie Els and Miguel Ángel Jiménez – it remains the most dominating performance and victory in any major championship.  As the United States Golf Association wanted to begin the millennium with a memorable tournament, Pebble Beach was moved up two years in the rotation.  Notable golfers going into the tournament at large included Jack Nicklaus, playing in his final U.S. Open; Vijay Singh, the year's Masters winner; Ernie Els; and David Duval.

Supporting paragraphs: 2009 U.S. Open (golf) Long Island
Answer: four