Hudson County is a densely populated county in the U.S. state of New Jersey. It lies west of the lower Hudson River, which was named for Henry Hudson, the sea captain who explored the area in 1609. Part of New Jersey's Gateway Region in the New York metropolitan area, the county's county seat and largest city is Jersey City, with a population of 292,449 enumerated at the 2020 U.S. Census. As of the 2020 United States Census, Hudson County was the fastest-growing county in New Jersey compared to 2010; the county reached total poulation of 724,854 as of 2020, representing an increase of 90,588 residents (14.3%) over the population of 634,266 counted in the 2010 U.S. Census, making Hudson the state's fourth-most populous county. Home to 15,693 residents per square mile (6,130/km2) in 2020, covering only 46.19 square miles of land, Hudson County is New Jersey's geographically smallest and most densely populated county as well. Its 2010 population in turn was an increase of 25,291 (4.2%) from the 2000 U.S. Census, when the county's population was established to be 608,975, Hudson Coutny shares extensive mass transit connections with Manhattan, located across the Hudson River, as well as with most of Northern and Central New Jersey.
White Plains is a city in Westchester County, New York, United States, and the eleventh-largest city in the state. An inner suburb of New York City, it is the county seat and commercial hub of Westchester, a densely populated suburban county that is home to approximately one million people. White Plains is located in south-central Westchester, with its downtown (Mamaroneck Avenue) 25 miles (40 km) north of Midtown Manhattan. As of 2013, the city's total population was estimated to be 57,866, up from 53,077 at the 2010 census. According to the city government, the daytime weekday population is estimated at 250,000. The city was ranked third in the top 10 places to live in New York for 2014, according to national online real estate brokerage Movoto.