Westchester County is a county in the U.S. state of New York. It is the second-most populous county on the mainland of New York, after the Bronx, and the most populous county in the state north of New York City. According to the 2010 Census, the county had a population of 949,113, estimated to have increased by 3.3% to 980,244 by 2017. Situated in the Hudson Valley, Westchester covers an area of, consisting of six cities, 19 towns, and 23 villages. Established in 1683, Westchester was named after the city of Chester, England. The county seat is the city of White Plains, while the most populous municipality in the county is the city of Yonkers, with an estimated 200,807 residents in 2016. The annual per capita income for Westchester was $67,813 in 2011. The 2011 median household income of $77,006 was the fifth highest in New York and the 47th highest in the United States. By 2014, the county's median household income had risen to $83,422.

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