This configuration of two area code in New Jersey remained in place for c. 33 years, until 1991, when the 201 numbering plan area was further divided to create area code 908 in its southern half.
The configuration of two area codes in New Jersey remained stable for approximately 33 years, from around 1968 to 1991. In 1991, the 201 numbering plan region was divided into a new area code 908 in its southern section.