New York · Eastern Time
631 Area Code
The 631 area code is a telephone area code in New York, covering Brentwood and the surrounding area. It lies in the Eastern Time zone.
Last updated June 5, 2026
Where is the 631 area code?
631 serves Brentwood and nearby communities in New York. In the wider directory it sits in the Northeast region.
Dialing 631
Brentwood is currently served by the single area code 631. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.
History of the 631 area code
631 is a geographic area code serving Brentwood and the surrounding part of New York. It was added after the original 1947 plan as telephone demand grew. For how codes are created, split, and overlaid, see how area codes work.
Is 631 a scam or spam risk?
631 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 631 number on your screen is no guarantee the caller is local or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other New York area codes
Explore more
See every code in New York, compare codes across the Northeast region, or view all Eastern Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
631 area code FAQ
Where is the 631 area code?
The 631 area code is in New York, serving Brentwood and the surrounding area in the Northeast region.
What time zone is 631 in?
631 is in the Eastern Time zone.
Do I have to dial 10 digits for 631?
Ten-digit dialing always works, and many areas now require it; some local calls in this area may still connect with seven digits.
Is 631 a toll-free or premium code?
No. 631 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.