Westchester County is located in the U.S. state of New York. It is the seventh most populous county in the State of New York and the most populous north of New York City. According to the 2020 United States Census, the county had a population of 1,004,456, its highest decennial count ever and an increase of 55,344 from the 949,113 counted in 2010. Located in the Hudson Valley, Westchester covers an area of 450 square miles, consisting of six cities, 19 towns, and 23 villages.