Area code 201 is one of the original area codes established in 1947 and was the first code assigned in the North American Numbering Plan. It originally covered all of New Jersey but now serves northeastern parts of the state, including cities such as Jersey City, Hoboken, Hackensack, and Fort Lee. In 2001, area code 551 was added as an overlay, and ten-digit dialing became mandatory. The 201 region is deeply integrated with the New York City metro area, serving as a residential and commercial hub for commuters. 201 remains an iconic area code with strong historical and cultural significance in New Jersey.