Starting Sunday, calls made within Nassau County's area code, 516, will all require dialing 10 digits (and depending on your carrier, 11 digits).

Beginning Q2 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.

Since October 2021, those with a 516 area code are used to the mandatory 10-digit dialing. The new area code will have the same rules.

Nassau County's new area code debuts Friday, adding 363 to 516. It's an effort to provide "numbering relief," says the New York State Public Service Commission, as the availability of 516-prefixed ...