631 Area Code — Brentwood, NY
Area code 631 serves Brentwood and 4 other cities in New York. Local time follows America/New_York. It overlays with 934, so 10-digit dialling is required.
- State
- New York
- Primary city
- Brentwood
- Timezone
- America/New_York
- In service since
- 1999
- Type
- Geographic
- Overlay codes
- 934
Cities Served by 631
The 631 area code covers 5 cities and communities in New York.
- Brentwood
- Brookhaven
- Babylon
- Huntington
- Smithtown
About Area Code 631
Area code 631 is a North American Numbering Plan (NANP) area code that has been in service since 1999. It is administered by NANPA on behalf of the FCC and serves the New York region anchored on Brentwood.
631 now shares its territory with an overlay code (934). 10-digit dialling is required for local calls within this region because the same 7-digit number can be assigned under either code.
Mobile numbers in 631 are portable: a person who moved away from Brentwood may still carry a 631 mobile number on their device. If you receive an unexpected call from a 631 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in New York, you may also interact with neighbouring or overlay codes (934). See the related codes section below to explore the rest of New York.
Other New York Area Codes
Continue exploring the New York numbering plan.
631 Area Code FAQ
Where is area code 631?
Area code 631 is located in New York, primarily serving Brentwood and surrounding cities including Brookhaven, Babylon, Huntington. The region operates on ET (America/New_York) time.
What state is 631 area code?
631 is a New York area code. It was put into service in 1999 and shares its geographic footprint with overlay code 934.
Is 631 a scam area code?
631 is a legitimate North American area code allocated by NANPA to New York. Like any geographic area code, scammers sometimes spoof 631 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 631 use?
Area code 631 operates on ET (America/New_York). Numbers in this area code follow standard New York time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 631 phone number?
Yes. Use the reverse lookup widget above to enter a full 631 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.
What's the difference between 631 and 934?
631 and 934 cover the same New York geographic area as overlay codes. Calls between them are local, but you must dial all 10 digits. New phone numbers in this region are assigned from either pool depending on what's available with the carrier at signup.