Area codes · +1
Area code 363
Area code 363 covers Nassau County, New York. We hold 360 allocated blocks for it across 11 rate centres, split 40% mobile, 5% landline and 56% VoIP.
The other area codes laid over 363
Area code 363 does not have Nassau County, New York to itself. 1 other code — 516 — serves the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
5165,607 blocks, 15 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 363 number and a 516 number from the same street can report different line types. Filtering Nassau County, New York by area code needs all 2 of them.
363 is not confined to Nassau County, New York itself: its blocks sit across 11 rate centres, named in the table below.
New York is split across 21 area codes — 347, 929, 646, 845, 315, 363 and others. By allocated blocks 363 is the 21th largest of them, holding 0% of the New York total.
Where 363 numbers are concentrated
Rate-centre names are reproduced as NANPA records them. The agency truncates them to ten characters, so longer names appear shortened elsewhere on this site.
| Rate centre | Blocks | Share of 363 |
|---|---|---|
| Nassau | 74 | 21% |
| Nassau | 68 | 19% |
| Nassau | 58 | 16% |
| Nassau | 32 | 9% |
| Nassau | 25 | 7% |
| Nassau | 25 | 7% |
| Nassau | 23 | 6% |
| Nassau | 21 | 6% |
| Nassau | 20 | 6% |
| Coldspghbr | 9 | 2% |
| Farmingdl | 5 | 1% |
Carriers holding the most 363 blocks
Onvoy138 blocks
AT&T Wireless74 blocks
Bandwidth32 blocks
Onvoy Spectrum31 blocks
Verizon Wireless28 blocks
Exiant Communications Llc13 blocks
Onvoy alone holds 38% of every block in 363, which is unusually concentrated for an area code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 363 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 363 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 363?
Area code 363 covers Nassau County, New York. It is not the only code there: 516 is an overlay on the same rate centres, so a Nassau County, New York number can start with any of them.
Is a 363 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 363 the split runs 40% mobile, 5% landline and 56% VoIP, so VoIP is the most likely single answer.
Which carriers hold 363 numbers?
The largest holders are Onvoy, AT&T Wireless, Bandwidth. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 363 numbers are there?
The code holds 360 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 363 covers on the order of 360,000 possible numbers — most of which have never been issued to anyone.