what area code is 609
Area code 609 serves telephones in southeastern and central New Jersey, including the cities of Trenton, Long Beach Island, Princeton, Hamilton and Atlantic City. In terms of geographic coverage, it is the largest in the state of New Jersey.In the original North American Number Plan (NANP), all of New Jersey was served by area code 201, until it was split in 1958 to create area 609.n terms of geographic coverage, it is the largest in the state of New Jersey. In the original North American Number Plan (NANP), all of New Jersey was served by area code 201, until it was split in 1958 to create area 609.