516 area code — Nassau, NY geographic

Data: NANPA public reports, current as of July 28, 2026.

The 516 area code covers Nassau, New York, Eastern time zone, and dates back to January 1, 1951. It is part of the 363/516 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 516 number can be used from anywhere — the code marks where the number was assigned.

783 central-office prefixes are currently active in this code, spread across 39 code-holding carriers. Thousands-block pooling applies to 487 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 15 distinct rate centers.

NANPA projects numbering capacity for the 363/516 complex to exhaust in 2Q 2073.

Dialing: 10D locally, 1+10D to other codes (1+10 digit permissible at service provider discretion. ).

To check where a specific 516 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.

516 was created from 914 in 1951. It has since spawned 631 (1999), 363 (2023).

Largest localities in 516

FAQ

Why do 363 and 516 cover the same place?

They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 363/516 complex shares one service area, and local calls are dialed with 10 digits.

Will 516 run out of numbers?

NANPA's current forecast projects exhaust in 2Q 2073 — decades of capacity remain.

Why am I getting spam calls from 516 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 516 number does not prove the call originated there — see our guide to spotting spoofed calls.