New York · Eastern Time
934 Area Code
Area code 934 is in New York, serving Suffolk County on eastern Long Island, including the Hamptons. It is in the Eastern Time zone. It shares its territory with overlay code 631, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 934 area code?
934 is a New York area code covering Suffolk County on eastern Long Island, including the Hamptons. In the wider directory it sits in the Northeast region.
Cities in the 934 area code
- Brentwood
- Huntington
- Islip
- Central Islip
- Smithtown
- Commack
- Bay Shore
- Lindenhurst
- Patchogue
- Babylon
- Stony Brook
- Port Jefferson
- Riverhead
- Southampton
- East Hampton
Counties served by 934
Suffolk County.
934 overlay codes and dialing
The 934 territory is covered by an overlay of 2 area codes: 631, 934. All of them serve the same geographic area, and the original code is 631. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 934 area code
934 went into service on July 16, 2016 as an overlay of 631, relieving number exhaustion in the Brentwood area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 934 a scam or spam risk?
934 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 934 number on your screen is no guarantee the caller is in Brentwood, NY 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 9XX 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
934 area code FAQ
Where is the 934 area code?
The 934 area code is in New York, covering Suffolk County on eastern Long Island, including the Hamptons, in the Northeast region.
What cities are in the 934 area code?
Cities in the 934 area code include Brentwood, Huntington, Islip, Central Islip, Smithtown, Commack, Bay Shore, Lindenhurst, Patchogue and Babylon.
What time zone is 934 in?
934 is in the Eastern Time zone.
What is the overlay for the 934 area code?
934 shares its territory with 631. Both codes (631, 934) serve the same area, so 10-digit dialing is required for every call.
When did the 934 area code start?
934 went into service on July 16, 2016 as an overlay of 631.
Do I have to dial 10 digits for 934?
Yes. Because 934 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 934 a toll-free or premium code?
No. 934 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.