The New York State Public Service Commission has announced that business and wireless customers within the existing 516 Nassau County area code region should begin to prepare for the introduction of the new 363 area code.

To meet the increasing demand for residential and business phone numbers in Nassau County, the commission says it approved a new area code to be added to the current 516 area code.

Beginning the second quarter of 2023, customers in the existing 516 area code requesting new service, an additional line or a move in the location of their service may be assigned a number in the new 363 area code.

Existing customers in the 516 area code will not be affected by the new overlay area code.

Customers will retain their current telephone numbers, and 10-digit dialing for local calls will continue. The overlay area code will be assigned to newly issued telephone numbers once all existing 516 telephone numbers are exhauste and will apply to all telephone numbers, regardless of service type.

With the addition of the new number, Long Island will officially have four area codes: 516 and 363 in Nassau County, and 631 and 934 in Suffolk County.

The new area code is projected to provide telephone number relief in Nassau County for approximately 49 years.