Caller ID for
Area code 631
Area code 631 Brentwood, New York
Area code 631 is in New York, with numbers assigned in Brentwood, Farmingdale, Riverhead and 48 more places. It’s 12:14 AM there now.
- State
- New York23 area codes in New York
- Time zone
- Eastern12:14 AM there now
- Exchanges
- 78251 places
- Overlay
- 934Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 631 is
Numbers in 631 are assigned to 51 places in 3 counties: Suffolk County, Nassau County and Rensselaer County.
No single place dominates: Brentwood, the largest, has 16% of the exchanges.
- Brentwood127
- Farmingdale42
- Riverhead40
- Huntington Bay34
- Central Islip32
- Amityville31
- Babylon28
- Deer Park27
- Patchogue26
- Ronkonkoma24
- Selden24
- Smithtown20
- Yaphank17
- Stony Brook15
- Lindenhurst15
- Port Jefferson15
- Bay Shore14
- Sayville14
- Southampton12
- Nassau12
- Northport12
- Islip11
- Commack11
- Bayport9
Phone companies in 631
782 blocks of numbers in 631 are held by 36 phone companies. The most belong to Verizon (228), T-Mobile (85) and Verizon Business (65).
A large share, about 40%, belongs to competitive and internet phone carriers; wireless networks hold 23% and local phone and cable companies 37%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
631 went into service in 1999, added to the area of 516.
934 (since 2016) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
18 new exchanges were assigned since 2021, the latest in September 2025.
Calling 631
It’s 12:14 AM Eastern time in 631 right now.
From elsewhere in the U.S., dial 1, 631 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
New York has 23 area codes: 212, 315, 329, 332, 347, 363, 465, 516, 518, 585, 607, 624, 631, 646, 680, 716, 718, 838, 845, 914, 917, 929 and 934.
- 203 · New Haven, CT · about 29 mi
- 475 · New Haven, CT · about 29 mi
- 212 · New York, NY · about 46 mi
- 332 · New York, NY · about 46 mi
- 347 · New York, NY · about 46 mi
- 646 · New York, NY · about 46 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 631 area code
Map of the 631 area code around Brentwood, Farmingdale and Riverhead, New York.
Cities on the map
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Questions about 631
Where is area code 631?
In New York, covering Brentwood, Farmingdale and Riverhead and other places across 3 counties.
What time zone is 631 in?
Eastern time. It was 12:14 AM there when this page loaded.
Is 631 an overlay?
Yes. 934 serves the same area, so dial all 10 digits for local calls.
Which phone companies have 631 numbers?
36 companies hold blocks; the most belong to Verizon, T-Mobile and Verizon Business. About 23% of blocks are wireless.
Is 631 running out of numbers?
Not on record. 18 new exchanges have been assigned since 2021.