Suffolk County
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Suffolk and Nassau counties together are generally referred to as "Long Island" by area residents — as distinct from the New York City boroughs of Queens (Queens County) and Brooklyn (Kings County), which geographically make up the island's western end.

In 2006 Forbes Magazine ranked six Suffolk County zip codes as among the top 110 most expensive in the United States. Sagaponack, New York was ranked the most expensive zip code in the nation with a median home sale price in 2005 of $2,787,500. Water Mill, New York was ranked the sixth most expensive zip code in the nation, with a median home sale price in 2005 of $2,150,000
Suffolk County is the easternmost county in New York State and the New York Metropolitan Area.
According to the U.S. Census Bureau, the county has a total area of 2,373 square miles (6,146 km²), of which, 912 square miles (2,363 km²) of it is land and 1,461 square miles (3,784 km²) of it (61.56%) is water. The highest elevation in the county, and on Long Island as a whole, is Jayne's Hill in West Hills, at 401 feet (122 m) above sea level. Suffolk County occupies the easternmost portion of Long Island, in the southeastern portion of New York State.