Hudson County is a county located in the U.S. state of New Jersey. As of the United States 2000 Census, the population was 608,975. Its county seat is Jersey City. It is part of the New York Metropolitan Area. Given its proximity to Manhattan, Hudson County is sometimes referred to as New York City's sixth borough.

According to the U.S. Census Bureau, the county has a total area of 62 square miles, of which, 47 square miles is land and 16 square miles (25.21%) is water. It is the smallest of New Jersey's 21 counties. Hudson is bordered by the Hudson River and Upper New York Bay to the east; Kill van Kull to the south; Newark Bay, and either the Hackensack River or Passaic River to the west.

The topography is marked by New Jersey Palisades in the north with cliffs overlooking the Hudson to the east and less severe cuesta or slope to the west. They gradually level off to the southern peninsula, which is coastal and flat. The western region, around the Hackensack and Passaic is part of the New Jersey Meadowlands.

There are two equally high points, 260 feet above sea level, in Guttenberg and West New York; the lowest point is sea level itself along the rivers.

Ellis Island and Liberty Island, opposite Liberty State Park, lie entirely within Hudson County's waters, which extend to the New York state line. Liberty Island is wholly part of New York. Ellis Island is jointly administered by the states of New Jersey and New York. Nine-tenths of its land is technically part of Hudson County, with the remainder being part of New York. Shooters Island, in the Kill van Kull, is also shared with New York. Robbins Reef Light sits atop a the reef which runs parallel the Bayonne and Jersey City waterfront.

Hudson County is also recognized as one of the Northeast's major transportation and industrial hubs.

Much of the county lies between the Hackensack and Hudson Rivers on geographically long narrow peninsula that is a contiguous urban area where it's often difficult to know when one's crossed a civic boundary. These boundaries and the topography-including many hills and inlets-create very distinct neighborhoods.

Hudson County is the smallest of New Jersey's 21 counties.

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