Brentwood, New York
631 Area Code
Establish a trusted local presence in Suffolk County and Long Island with a 631 area code number. Ideal for businesses that want higher pickup rates and local trust across Brentwood, Hamptons communities and eastern Long Island.
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About 631 Area Code
Area code 631 serves Suffolk County on Long Island in New York. Created on November 1, 1999, as a split from the original 516 numbering plan, 631 covers major communities including Brentwood, West Babylon, Huntington, Smithtown and the Hamptons, stretching from the Nassau County border to Montauk Point. The code supports local voice and SMS-capable numbers used by healthcare providers, tourism operators, life sciences companies and small businesses throughout the region.
The 631 region combines pharmaceutical and biotech innovation (with more than 150 life sciences companies), tourism centered around the Hamptons beaches and wineries, advanced manufacturing at Hauppauge Industrial Park, and financial services. Local businesses use 631 numbers for patient appointment reminders, hotel reservations, supplier coordination and customer support. A local number drives higher answer rates because residents recognize and trust the area code more than toll-free or out-of-state alternatives.
FoneSwift lists live 631 inventory and capabilities on this page. Search numbers to see which support Voice, SMS and MMS. Since 631 shares geographic coverage with overlay code 934 (introduced in 2016), inventory availability fluctuates. If a local 631 number is unavailable immediately, the 934 overlay serves the same Suffolk County area and delivers equivalent local presence for Long Island audiences.
If your business targets Suffolk County or the Hamptons, publish numbers in both local and E.164 formats (e.g., (631) 555-1234 and +1 631 555 1234) and register messaging traffic if you plan A2P campaigns. For porting, see our porting guide. Many businesses maintain consistent numbers across platforms to preserve customer recognition and brand continuity, especially important for seasonal tourism operations.
| Country | United States |
| State | New York |
| Area code | 631 |
| Primary cities | Brentwood, West Babylon, Coram, Hicksville |
| Counties served | Suffolk |
| Timezone | America/New York (EST) |
| Created | November 1, 1999 |
| International Format | +1 631 XXX XXXX |
| Local Format | (631) XXX-XXXX |
10-digit dialing is mandatory within and into the 631/934 overlay region. Register A2P messaging for business SMS to comply with US carrier rules (10DLC).
Area code 631 uses Eastern Standard Time (EST, UTC-5) and observes Daylight Saving Time, shifting to EDT (UTC-4) during summer months. Business hours typically align with Eastern Time.
Local numbers are commonly used for higher answer rates and regional trust. If needed, consider the 934 overlay or 516 (Nassau County) for additional inventory while preserving a Long Island presence.
Quick Facts about 631 Area Code
Interesting tidbits about this area code 631
Split from 516
Area code 631 was created in 1999 when Suffolk County split from Nassau County's 516 area code due to growing demand driven by cellular phones and internet dial-up services.
Hamptons destination
631 covers the famous Hamptons beach communities including Southampton, East Hampton and Montauk. Tourism businesses use local numbers for hotel reservations, restaurant bookings and vacation rentals.
Life sciences hub
Suffolk County hosts over 150 pharmaceutical and biotech companies, making it the largest concentration of life sciences firms in New York State outside of Manhattan.
Hauppauge Industrial Park
The 631 region includes Hauppauge Industrial Park, once the largest industrial park on the East Coast. More than 1,300 companies operate there today, spanning manufacturing, tech and professional services.
Montauk Point Lighthouse
Area code 631 reaches all the way to Montauk Point, home to New York State's oldest lighthouse (built in 1796). Tourism operators use local numbers to coordinate lighthouse tours and fishing charters.
Wine country presence
The 631 region includes Long Island's North Fork wine country with over 80 vineyards. Wineries and tasting rooms rely on local numbers for reservations and event bookings throughout the year.
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How Does Local 631 Phone Numbers Work?
A local business number is a structured telephone identifier that tells networks where to route calls and messages. When you use a 631 number in Brentwood and New York, the digits signal the international gateway, the geographic region, the local exchange and the specific subscriber, so calls reach the right destination quickly and reliably.
The typical parts of a United States local number are:
- Country code (+1): identifies United States for international routing.
- Area code (631): directs the call to the Brentwood / New York region.
- Central office / exchange (eg. 555): narrows the call to a local switching area or rate center.
- Subscriber number (eg. 1234): the unique line assigned to a person, extension, or device.
Example formats:
| International Format (E.164) | +1 631 555 1234 |
| Local Format (National) | (631) 555-1234 |
Quick Dialing Guide
The correct formats to reach 631 numbers locally and globally.
From Landlines
Standard United States FormatUse for domestic long-distance calls within United States.
From Mobile
E.164 InternationalThe universal format. Works on any mobile device, anywhere.
International
From abroadDialing from outside United States (exit code 00 varies by country).
With FoneSwift, your 631 number can be instantly configured through our intuitive dashboard. Connect it to call forwarding rules, AI voice agents, IVR menus, or route calls directly to any device. Enable voice, SMS, and MMS capabilities right from your account, no technical setup required. Your number becomes active immediately after purchase, and you can update routing, business hours, and integrations anytime.
For businesses, local numbers offer clear benefits: higher answer rates, stronger local recognition, and better performance for local campaigns and customer trust. Typical business features include call forwarding, call recording, auto-attendants, voicemail-to-email, and multi-device ringing.
Important operational notes:
- SMS & A2P: If you plan to send application-to-person messages from a 631 number, register your traffic where required and follow carrier rules (10DLC/A2P) to avoid deliverability or throughput issues.
- Number Porting: Bring your existing 631number to FoneSwift seamlessly. Our team handles the entire porting process, simply submit your number details and we'll coordinate with your current provider. Porting typically completes within 5-10 business days, and you'll receive updates at each step. There's no service interruption during the transfer.
- Display & formatting: Always publish numbers in both local and E.164 formats so international and mobile users can easily dial.
Ready to get started? Browse available 631 numbers in the phone numbers section above, you'll see real-time availability and can filter by features like voice, SMS, and MMS. Once you find your perfect number, purchase it in seconds and start making calls immediately. Our team is here to help you choose the right setup for your business needs, whether you're setting up AI receptionists, call forwarding, or SMS campaigns. Start your 14-day free trial today, no credit card required.
How to Get a 631 Phone Number
Buying a local 631 phone number using FoneSwift is easy and takes just a few minutes. Follow these simple steps to get your local 631 phone number and start connecting with customers in United States today.
Create a new account on FoneSwift or sign in to your existing account to get started.
Once logged in, you'll be taken to your FoneSwift dashboard where you can manage all your phone numbers and settings.
Click on Settings in the sidebar, then go to "My Numbers" and click the "Add a Number" button.
Choose United States as your country from the dropdown menu.
Select Local as the type of number, then choose the 631 area code from the available options.
Click the "Search" button to see all available phone numbers with the selected area code.
Browse through the available numbers, select one that fits your needs, click "Buy Number", and confirm your purchase.
Your number is now active! Start making and receiving calls from the FoneSwift Dialer immediately.
You can configure your number to handle calls, forward calls, or even create an AI voice agent to handle the calls for you.
Businesses Using 631 Phone Numbers
Suffolk County and Long Island support life sciences, tourism, advanced manufacturing and healthcare businesses. Local phone numbers are commonly used for customer-facing operations and seasonal campaigns.
Life sciences & biotech
Pharmaceutical companies, biotech firms and research labs use local numbers for clinical trial recruitment, B2B partnerships and regulatory communications. A local area code enhances credibility in the medical community.
Tourism & hospitality
Hotels, bed and breakfasts, vacation rentals and tour operators in the Hamptons and Montauk use 631 numbers for reservations, concierge services and guest communications throughout peak summer seasons.
Advanced manufacturing
Manufacturing companies in aerospace components, medical devices and industrial equipment use local numbers for supplier coordination, quality control and customer support across Suffolk County.
Healthcare providers
Hospital networks, medical practices and telehealth providers rely on 631 numbers for appointment scheduling, prescription reminders and patient follow-up calls. Local numbers improve callback rates and patient trust.
Wineries & craft beverages
Vineyards, craft breweries and distilleries use local numbers for tasting room reservations, wine club communications and event bookings. The region has over 130 craft beverage producers.
Financial services
Regional banks, wealth management firms and insurance agencies use 631 numbers for customer service, loan origination and financial advisory consultations across Long Island communities.
Why Choose 631 Local Phone Number for Your Business?
Discover the advantages of having a local phone number that builds trust, increases engagement, and drives results.
Powerful Features for Your 631 Local Phone Number
Get the most out of your localphone number with FoneSwift's enterprise-grade features designed to help your business communicate more effectively.
Nearby Area Codes
Explore other area codes in the same region to expand your local presence.
Frequently Asked Questions
What cities use the 631 area code?
When was the 631 area code created?
Can I get SMS-capable numbers in area code 631?
Is 631 different from 934?
Do I need to dial 10 digits for 631 numbers?
Is 631 a toll-free code?
How do I buy a 631 local phone number?
Can I use 631 numbers for Hamptons seasonal businesses?
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