631 Area Code: Brentwood, New York
Area code 631 serves Brentwood, Farmingdale and Riverhead, New York in the Eastern time zone, in service since 1999. Consumers have filed 6,983 unwanted-call complaints against 5,249 different 631 numbers, 544 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 631 at a glance
- State
- New York
- Main cities
- Brentwood, Farmingdale, Riverhead, Huntington, Central Islip, Amityville + 48 more
- Counties
- Suffolk County, Nassau County
- Local time
- —Eastern
- In service since
- November 1, 1999
- Split from
- 516
- Overlay code
- 934 (2016)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 54 rate centers, 782 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 631 numbers
No single 631 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
What calls from 631 numbers are about
2,139 FTC Do Not Call complaints about 631 numbers since Jul 24. The most common named subject is debt-relief pitches, at 36% of complaints (91% of those were recorded messages). Overall, 77% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified85940%
- Debt reduction76936%
- No subject given1306%
- Impostor (government, business, family)1246%
- Dropped call / no message1155%
- Medical & prescriptions613%
- Warranties & protection plans231%
FCC complaints by call type, last 2 years
- Prerecorded Voice27660%
- Live Voice13429%
- Text Message5111%
11% of recent FCC complaints about 631 numbers are about text messages, not calls.
When 631 spam calls come in
30% of complaints that give a call time describe calls between 10am and 1pm. 92% came Monday to Friday, most on Wednesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
618 FTC complaints about 631 numbers in the last four weeks, down 9% on the four weeks before. FCC complaints about 631 numbers peaked in 2015 (880); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
Only 36% of the FTC complaints about 631 numbers came from New York residents; the most came from Florida, California and Texas. 631 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- New York76736%
- Florida1648%
- California1376%
- Texas1025%
- Pennsylvania784%
What people with 631 numbers report
People whose own number starts with 631 filed 1,856 FTC complaints since Jul 24. 30% were about calls showing another 631 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 631 (same code)56230%
- 516694%
- 833 (toll-free)513%
- 914493%
- 866 (toll-free)483%
Likely campaigns using 631 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 631 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (631) 500-xxxxcampaign | 21 | 21 | Onvoy (Sinch) | Water Mill |
| (631) 818-xxxx | 19 | 19 | Cablevision Lightpath, INC. | Babylon |
| (631) 837-xxxxcampaign | 16 | 16 | MCImetro (Verizon Business) | Northport |
| (631) 931-xxxxcampaign | 16 | 14 | Wide Voice, LLC | East Hampton |
| (631) 659-xxxxcampaign | 15 | 14 | Cablevision Lightpath, INC. | Cold Spring Harbor |
Carriers operating in 631
NANPA has assigned 782 631 prefixes (NPA-NXX central-office codes) across 54 rate centers: 24% to wireless carriers, 74% to landline and VoIP operators; 77% are pooled blocks shared by several carriers. The newest assignment was 2025-09-03. The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Verizon (landline) | Incumbent landline (ILEC) | 228(29%) | 53 | 2006-02-03 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 64(8%) | 33 | 2014-04-28 |
| Cablevision Lightpath, INC. | Competitive / VoIP (CLEC) | 55(7%) | 35 | 2019-10-09 |
| Omnipoint Communications, INC. | Wireless | 55(7%) | 11 | 2023-09-07 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 53(7%) | 33 | 2012-02-20 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 49(6%) | 6 | 2024-11-25 |
| Verizon Wireless (Cellco Partnership) | Wireless | 44(6%) | 4 | 2018-03-13 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 37(5%) | 28 | 2024-11-11 |
| Tc Systems, INC. | Competitive / VoIP (CLEC) | 34(4%) | 28 | 2018-09-06 |
| PAETEC (Windstream) | Competitive / VoIP (CLEC) | 32(4%) | 21 | 2014-03-03 |
| Csc Voice, LLC | Competitive / VoIP (CLEC) | 30(4%) | 22 | 2020-03-09 |
| Metro by T-Mobile (MetroPCS) | Wireless | 30(4%) | 12 | 2025-03-27 |
Largest rate centers (exchanges) by prefixes: Brentwood (127), Farmingdale (42), Riverhead (40), Huntington (34), Central Islip (32), Amityville (31), Babylon (28), Deer Park (27), Patchogue (26), Ronkonkoma (24). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 631 numbers
Before you call back
- Debt reduction is the top named complaint here. Don't pay upfront fees for debt relief; the FTC's Telemarketing Sales Rule bans them. Talk to your lender or a nonprofit credit counselor instead. Read about debt-relief robocalls.
- Look up the full number above. A missed call from 631 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in New York
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: New York Attorney General.
- New York formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 631: questions answered from the data
Where is area code 631?
Area code 631 serves Brentwood, Farmingdale and Riverhead, New York, covering Suffolk County and Nassau County. It has been in service since November 1, 1999. It was split from area code 516.
What time zone is area code 631 in?
Area code 631 is in the Eastern time zone (UTC−5, or UTC−4 during daylight saving time). The current local time is shown at the top of this page.
Which area codes overlay 631?
934 (in service 2016) serves the same area as 631. New numbers there can be issued with any of these codes, and local calls need all 10 digits. A spoofed call can display any of them.
What are calls from 631 numbers usually about?
Since Jul 24, consumers filed 2,139 FTC Do Not Call complaints about 631 numbers. The most common named subject was debt-relief pitches: 36% of complaints, 91% of them recorded messages. Across all subjects, 77% of callers who answered the question said the call was a robocall.
When do 631 spam calls happen?
30% of the complaints that give a call time describe calls between 10am and 1pm, and 92% came on weekdays, most often on Wednesday. Times are as consumers reported them.
Are calls from 631 numbers really local?
Not necessarily. Only 36% of the FTC complaints about 631 numbers came from New York residents; the most came from Florida, California and Texas. 631 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 631 robocalls increasing?
In the four weeks to Oct 15, consumers filed 618 FTC complaints about 631 numbers, 9% fewer than the four weeks before.
How do I report a 631 scam call in New York?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In New York, the New York Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Overlay and nearby area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.