Area code 631: where it is and who calls from it
Area code 631 is in New York.
New York (Suffolk County on Long Island)
| Where | New York |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 1999 |
| Overlay | Yes, with 934 |
| Prefixes assigned | 782 of 792 possible (99%) |
Overlay: 631 covers the same area as 934. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 631 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 631, with how many prefixes each has.
Who holds 631 numbers
- Mobile carrier 23%
- Local phone company 30%
- Internet / business phone carrier 39%
- Paging service 1%
- Phone company 7%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Verizon (local phone) | Local phone company | 228 | 29% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 65 | 8% |
| T-Mobile (including Sprint) | Mobile carrier | 55 | 7% |
| Level 3 (Lumen) | Internet / business phone carrier | 55 | 7% |
| Cablevision Lightpath | Internet / business phone carrier | 55 | 7% |
| AT&T Mobility | Mobile carrier | 49 | 6% |
| Verizon Wireless | Mobile carrier | 44 | 6% |
| Onvoy | Internet / business phone carrier | 38 | 5% |
| Tc Systems | Phone company | 34 | 4% |
| Windstream (PAETEC) | Internet / business phone carrier | 32 | 4% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: New York.
Other area codes in New York
212 315 329 332 347 363 465 516 518 585 607 624 646 680 716 718 838 845 914 917 929 934
Got a call from 631?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 631 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.