363 area code — Nassau, NY geographic
The 363 area code covers Nassau, New York, Eastern time zone, and dates back to January 20, 2023. It is part of the 363/516 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 363 number can be used from anywhere — the code marks where the number was assigned.
32 central-office prefixes are currently active in this code, spread across 12 code-holding carriers. Thousands-block pooling applies to 31 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 11 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 dialing for all calls permissible at service provider discretion).
To check where a specific 363 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.
363 was created from 516 in 2023.
Largest localities in 363
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Nassau Zone 02 | 7 | 516 |
| Nassau Zone 05 | 5 | 516 |
| Nassau Zone 07 | 4 | 516 |
| Nassau Zone 08 | 3 | 516 |
| Nassau Zone 01 | 3 | 516 |
| Nassau Zone 04 | 2 | 516 |
| Nassau Zone 06 | 2 | 516 |
| Nassau Zone 03 | 2 | 516 |
| Nassau Zone 09 | 2 | 516, 631 |
| Cold Spring Harbor | 1 | 516, 631 |
FAQ
Why am I getting spam calls from 363 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 363 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 363 number from?
363 is assigned to Nassau and surrounding areas of New York in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 363 a toll-free number?
No. 363 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 516 and 363 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.