New Jersey ( / n juː ˈ dʒ ɜr z i /, local pronunciation: / n uː ˈ dʒ ɜr z i /) is a state in the Mid-Atlantic region of the United States. It is bordered on the northeast by New York, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania and on the southwest by Delaware. New Jersey lies largely within the sprawling metropolitan areas of New York City and Philadelphia. It is the most densely populated state in the United States.

The area was inhabited by Native Americans for more than 2,800 years, with historical tribes such as the Lenape along the coast. In the early 1600s, the Dutch and the Swedes made the first European settlements. The English later seized control of the region, naming it the Province of New Jersey. It was granted as a colony to Sir George Carteret and John Berkeley, 1st Baron Berkeley of Stratton. At this time, it was named after the largest of the British Channel Islands, Jersey, where Carteret had been born. New Jersey was the site of several decisive battles during the American Revolutionary War.

In the 19th century, factories in cities such as Paterson and Trenton helped to drive the Industrial Revolution. New Jersey's position at the center of the Northeast megalopolis, between Boston, New York City, Philadelphia, Baltimore and Washington, D.C., fueled its rapid growth through the suburban boom of the 1950s and beyond. Today, New Jersey has the highest population density and the second highest median income of any state in the United States. Only Maryland has a higher median income. The Governor of New Jersey is Republican Chris Christie.