New Jersey is a state located in both the Mid-Atlantic and Northeastern regions of the United States, at the geographic hub of the heavily urbanized Northeast megalopolis. It is bordered to the northwest, north, and northeast 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 over 9.5 million residents as of 2024 U.S. Census Bureau estimates, its highest population ever, the state 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, and is the most densely populated U.S. state.

New Jersey was first inhabited by Paleo-Indians as early as 13,000 B.C.E. The Lenape were the dominant Indigenous group when Europeans arrived in the early 17th century, and they were subdivided into dialectal groups such as the Munsee, in the north, and the Unami and the Unalachtigo, elsewhere. Dutch and Swedish colonists founded the first European settlements in the state, with the British later seizing control of the region and establishing the Province of New Jersey, named after Jersey. 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. New Jersey remained in the Union during the American Civil War and provided troops, resources, and military leaders in support of the Union Army. After the war, the state emerged as a major manufacturing center and a leading destination for immigrants, helping drive the Industrial Revolution in the U.S. New Jersey was the site of many industrial, technological, and commercial innovations. Many prominent Americans associated with New Jersey have proven influential nationally and globally, including in academia, advocacy, business, entertainment, government, military, non-profit leadership, and other fields.