Hudson County, New Jersey Hudson County, New Jersey Hudson County, a county in the U.S. state of New Jersey, 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, Jersey City is its largest city and county seat. As of the 2017 Census estimate, Hudson County was the fastest-growing county in New Jersey compared to 2010; the county's population was 691,643, making it the state's 4th-most populous county, an increase of 9.0% from the 2010 United States Census, when its
New Jersey v. New York channel. This agreement was fashioned in order to allow New Jersey to build docks on the riverfront, while allowing New York to control islands that it already considered integral parts of its territory. This led to places such as Ellis Island located on the New Jersey side of the river, but belonging to New York. Between the 1890s and 1934, Ellis Island was expanded through land reclamation and soon became a major center for immigrants coming from Europe to the New World. This land was added by the federal government and considered part of New York for decades before New