Area code 631 covers Brentwood and surrounding areas in New York. It was activated in 1999 as an overlay of area code 516. Today it shares its territory with overlay code 934. For the full picture, see all New York area codes.
| State | New York |
|---|---|
| Primary city | Brentwood |
| Cities also served | Brentwood, Huntington, Bay Shore, Islip, Babylon, Smithtown, Riverhead, East Hampton |
| Time zone | Eastern (UTC-5 / UTC-4 DST) |
| Year established | November 1, 1999 |
| Original 1947 NPA? | No |
| Parent code | 516 |
| Overlay codes | 934 |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Yes |
Cities Served by Area Code 631
Area code 631 serves Suffolk County, Long Island, New York, including the following cities and communities:
- Brentwood
- Huntington
- Bay Shore
- Islip
- Babylon
- Smithtown
- Riverhead
- East Hampton
Nearby area codes covering the same broader region include: 516, 934.
How to Get a 631 Phone Number
There are three ways to get a phone number with the 631 area code, each suited to a different need:
Ready to Get a 631 Number?
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Browse 631 Numbers →- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 631 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 631 inventory.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 631 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 631 number. If you already have a 631 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of New York sometimes can’t accept inbound ports of 631 numbers due to 911 routing rules.
Looking for a 631 number? 212areacode.com offers premium 631 numbers for Brentwood, New York — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 631 numbers →
Frequently Asked Questions
Is the 631 area code still in use?
Yes. 631 is actively assigned to new phone lines in Suffolk County, Long Island, New York.
What is the difference between 631 and 934?
Today they share the same geographic territory in New York. New phone lines in the area may be assigned either code. The two codes work identically for calling, billing, and service.
What is the parent area code of 631?
Area code 631 is an overlay of 516. Both codes serve the same region of New York.
Can I get a 631 number if I don't live in New York?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 631 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 631 a scam area code?
No. 631 is a legitimate, active area code for Suffolk County, Long Island, New York. Like any area code, scammers occasionally spoof 631 caller IDs, but the code itself is heavily used by real New York businesses, government offices, and residents.
What area does the 631 area code cover?
Area code 631 covers Suffolk County on Long Island, New York, serving communities such as Brentwood, Huntington, Bay Shore, Islip, Babylon, Smithtown, Riverhead, and East Hampton.
When was area code 631 created?
Area code 631 went into service on November 1, 1999, when it was split from area code 516. Nassau County kept 516, while Suffolk County was assigned the new 631 code.
What is the overlay code for 631?
Area code 934 was added as an overlay to 631 on July 16, 2016, to relieve number exhaustion. Both 631 and 934 serve the same geographic area of Suffolk County, and ten-digit dialing is required for all local calls.
Do I need to dial ten digits when calling a 631 number locally?
Yes. Because area code 934 overlays 631, all local calls within Suffolk County require ten-digit dialing — the area code plus the seven-digit number.
