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Westchester County is a county located in the U.S. state of New York. Westchester covers an area of 450 square miles and has a population of 949,113 according to the 2010 Census, residing in 45 municipalities. It was named after the city of Chester in England, and the county seat is White Plains. The county's location puts New York City and Long Island Sound to its south, Putnam County on the north, Connecticut on the east, Rockland County on the west. Westchester became the first suburban area of its scale in the world to develop. Its significance as a suburb derived mostly from the upper-middle class development of entire communities in the late 19th century, and the rapid population growth that occurred as a result. According to 2006 HUD data, the median income for a household of one person in the county was $75,427 and the median income for a family of four was $96,500. Westchester County ranks number two for wealthiest counties in New York State and the seventh wealthiest county nationally. Westchester County has long been associated with "old money" and some of the country's wealthiest families for generations. (via Freebase)