631 area code
Area code 631 is in New York. It covers Brentwood, Wyandanch, West Babylon and 162 other places: 116 ZIP codes in Suffolk and Nassau counties. Local time there is , Eastern Time. In service since 1999; 934 (2016) overlays it, so a number from there can have either code.
Who calls from a 631 number
NANPA records the carrier each block of 631 numbers is assigned to. Of the 7.5 million 631 numbers assigned, 45% are with cable, internet-calling, business and other carriers (Onvoy and Optimum); 30% with mobile carriers (T-Mobile, Verizon Wireless and AT&T Mobility); 24% with local phone companies (Verizon); 1% with paging companies.
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Verizon | Landline | 24% |
| T-Mobile | Mobile | 14% |
| Onvoy | Cable, VoIP, other | 10% |
| Optimum | Cable, VoIP, other | 8% |
| Verizon Wireless | Mobile | 8% |
| AT&T Mobility | Mobile | 7% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 631
The 46 places with a telephone rate centre of their own using 631, largest first. Each links to its ZIP codes.
Nearby places using 631
These places have no rate centre of their own in NANPA's records; the nearest one uses 631. Near an area-code boundary that can be wrong for part of a town.
- Wyandanch
- West Babylon
- Coram
- Huntington Station
- Centereach
- Shirley
- West Islip
- Holbrook
- Medford
- Dix Hills
- Copiague
- East Patchogue
- North Amityville
- Hauppauge
- North Bay Shore
- Melville
- East Northport
- Holtsville
- Lake Ronkonkoma
- North Babylon
- Mastic Beach
- Farmingville
- Mastic
- Greenlawn
- Manorville
- Nesconset
- East Islip
- Rocky Point
- Ridge
- Elwood
- Miller Place
- Mount Sinai
- North Bellport
- Lake Grove
- Middle Island
- North Lindenhurst
- Terryville
- Fort Salonga
- East Setauket
- South Huntington
- Stony Brook University
- Bohemia
- Springs
- Wading River
- Baywood
- Port Jefferson
- Port Jefferson Station
- East Shoreham
- Sound Beach
- Oakdale
- North Patchogue
- Flanders
- North Sea
- East Moriches
- Centerport
- East Hampton North
- East Farmingdale
- Calverton
- East Quogue
- West Hills
ZIP codes in area code 631
116 ZIP codes in 108 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 631 numbers are issued
NANPA's rate centres with the most 631 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
BRENTWOOD | Brentwood | 127 |
FARMINGDL | Farmingdale | 42 |
RIVERHEAD | Riverhead | 40 |
HUNTINGTON | Huntington | 34 |
CENTRAISLP | Central Islip | 32 |
AMITYVILLE | Amityville | 31 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 631
Where is area code 631?
Area code 631 is in New York. It covers Brentwood, Wyandanch, West Babylon and 162 other places: 116 ZIP codes in Suffolk and Nassau counties.
What ZIP codes are in area code 631?
116 ZIP codes, by the town each is mailed to: Brentwood (11717), Wyandanch (11798), West Babylon (2, 11704 to 11707), Coram (11727) and 104 more towns. The full list is on this page.
What time zone is area code 631 in?
Eastern time.
Is a 631 number a mobile or a landline?
It can be either. 30% of 631 numbers are assigned to mobile carriers and 24% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
What area codes overlay 631?
934. They cover the same area as 631, so a new number there can be given any of them.
Does a 631 number mean the caller is in New York?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 631 call can come from anywhere.
Other area codes in New York
- 212 Manhattan
- 315 Syracuse
- 329 Poughkeepsie
- 332 Manhattan
- 347 Brooklyn
- 363 Valley Stream
- 465
- 516 Valley Stream
- 518 Schenectady
- 585 Rochester
- 607 Binghamton
- 624
- 646 Manhattan
- 680 Syracuse
- 716 Buffalo
- 718 Brooklyn
- 838 Schenectady
- 845 Poughkeepsie
- 914
- 917 New York City
- 929 Brooklyn
- 934 Bay Shore
All 23 New York area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 631.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/631
Underlying data is public domain or openly licensed — sources, vintages and licences.