The 516 area code is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of New York. It covers Nassau County, which is located in southeastern New York and includes cities such as Hempstead, Levittown, and Freeport. The area code was created in 1951 from area code 914 and was split in 1999, creating the need to update some of the phone numbers to area code 631. In 2023, area code 363 was created and is currently an overlay to 516. The Eastern time zone is also known as America/New_York, and the 516 area code is located in this timezone.