New Jersey is a state situated within both the Mid-Atlantic and Northeastern regions of the United States. It is the most densely populated of all 50 U.S. states, and is situated at the center of the Northeast megalopolis. New Jersey is bordered on its north and east by New York state; on its east, southeast, and south by the Atlantic Ocean; on its west by the Delaware River and Pennsylvania; and on its southwest by Delaware Bay and Delaware. At 7,354 square miles (19,050 km2), New Jersey is the fifth-smallest state in land area, but with close to 9.3 million residents as of the 2020 United States census, its highest decennial count ever, it ranks 11th in population. The state capital is Trenton, and the state’s most populous city is Newark. New Jersey is the only U.S. state in which every county is deemed urban by the U.S. Census Bureau with 13 counties included in the New York metropolitan area, seven counties in the Philadelphia metropolitan area, and Warren County part of the heavily industrialized Lehigh Valley metropolitan area.

New Jersey was first inhabited by Paleo-Indians as early as 13,000 B.C.E., with the Lenape being the dominant indigenous group when Europeans arrived in the early 17th century. Dutch and Swedish colonists founded the first European settlements in the state,[10] with the British later seizing control of the region and establishing the Province of New Jersey, named after the largest of the Channel Islands. The colony’s fertile lands and relative religious tolerance drew a large and diverse population. New Jersey was among the Thirteen Colonies that supported the American Revolution, hosting several pivotal battles and military commands in the American Revolutionary War. On December 18, 1787, New Jersey became the third state to ratify the United States Constitution, which granted it admitted to the Union, and it was the first state to ratify the U.S. Bill of Rights on November 20, 1789.