631 area code
Brentwood area, Eastern Time.Area code 631 covers Brentwood, Farmingdale, Riverhead and 50 more places in New York, on Eastern Time. 934 covers the same area.
Right now in Brentwood
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
Small talk
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Where 631 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 631 has 53. Each one's share is how many 631 numbers start there. Its biggest metro area is New York-Newark-Jersey City, NY-NJ.
- Brentwood16%
- Farmingdale5%
- Riverhead5%
- Huntington4%
- Central Islip4%
- Amityville4%
- Babylon4%
- Deer Park4%
- Patchogue3%
- Ronkonkoma3%
- Selden3%
- Smithtown3%
Also: Yaphank, Lindenhurst, Port Jefferson, Stony Brook, Bay Shore, Sayville, West Commack, Southampton, Northport, Islip, Commack, Bayport + 29 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 631 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 631 number to them, since you can't tell a work line from a personal cell.
What applies to 631Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
631 and 934
631 went into service on November 1, 1999, split off from 516. 631 and 934 cover the same area, so new numbers can get either code and neighbors can have different area codes. 631 holds 86% of the area's exchanges; 934 holds the rest. Local calls take all 10 digits.
- 1999631 starts
- 2016934 overlay
Source: NANPA area code database
Calling a list of 631 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
631 area code FAQ
What area code is 631?
631 is a New York area code for Brentwood, Farmingdale, Riverhead, Huntington and 49 more places.
What time zone is the 631 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 934 the same as 631?
Same area, different code. 631 and 934 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 631 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 631 area code start?
On November 1, 1999. It was split from 516.
Calling 631 numbers? Reach more of them.
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