What area code is 631?
Here's everything about it.
Instant lookup for the 631 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
631 at a glance
Summary
Cities & regions served by 631
Suffolk County1 community on record for 631.
Where 631 sits on the map
Overlay: 934Coverage area
About the 631 region
631 covers Suffolk County in New York. The code has been in service since 1999.
As the Suffolk County region grew, 631 ran low on available numbers, so 934 was added as an overlay code over the same geographic area. Both codes are local to each other and 10-digit dialing applies throughout.
Split of 516; 2016: overlaid by 934.
Who called me from 631?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 631 does not prove the caller is really in the 631 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 631 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 631 number below.
Frequently asked questions
FAQWhat area code is 631?+–
631 is a telephone area code serving Suffolk County in New York, United States, in service since 1999.
Where is area code 631 located?+–
It covers Suffolk County in New York.
What time zone is 631?+–
631 observes Eastern (ET), which is UTC−5 / −4 DST and follows daylight saving time.
When did area code 631 start?+–
631 entered service in 1999. Its history: split of 516; 2016: overlaid by 934.
Why do calls to 631 require 10-digit dialing?+–
631 shares its territory with overlay code 934. Because both codes serve the same geographic area, the phone network needs all 10 digits to route a call, and calls between the codes are still local.
Is 631 a scam area code?+–
Scam and robocall traffic can use any North American code, 631 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 631 number, and report anything suspicious.
Can I get a 631 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 631 number regardless of where you physically live.