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
Jersey City, New Jersey Jersey City, New Jersey Jersey City is the second-most-populous city in the U.S. state of New Jersey, after Newark. It is the seat of Hudson County as well as the county's largest city. As of 2017, the Census Bureau's Population Estimates Program calculated that Jersey City's population was 270,753, with the largest population increase of any municipality in New Jersey since 2010, an increase of about 9.4% from the 2010 United States Census, when the city's population was at 247,597. ranking the city the 75th-most-populous in the nation. Part of the New York metropolitan area, Jersey City is bounded on