www.cityofwhiteplains.com White Plains is a city in the U.S. state of New York. It is the commercial hub and the seat of Westchester County, an affluent suburban county that is home to almost one million people, just north of New York City. It is located in south-central Westchester, about 4 miles (6 km) east of the Hudson River and 2.5 miles (4.0 km) northwest of Long Island Sound. It is bordered to the north by the town of North Castle, to the north and east by the town/village of Harrison, to the south by the town/village of Scarsdale and to the west by the town of Greenburgh. As of the 2010 U.S. census, the city had a total population of 56,853. According to the city government, the daytime weekday population is estimated at 250,000.