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631 Area Code

Area code 631 serves West Babylon, Coram, Central Islip, Commack, Huntington Station and nearby communities in New York. It has been in service since November 1, 1999, when it was split from 516.

StateNew York
Time zoneEastern
Local time now…
Prefixes in use782
Overlay with934
Projected to run out2079
West BabylonCoramCentral IslipCommackHuntington StationCentereachBay ShoreShirleyDeer ParkLindenhurstWest IslipHolbrookMedfordDix HillsSmithtownCopiagueSeldenEast PatchogueHauppaugeNorth Bay ShoreNorth AmityvilleHuntingtonEast NorthportHoltsvilleRonkonkomaLake RonkonkomaNorth BabylonIslipHampton BaysFarmingvilleMastic BeachKings ParkSayvilleRiverheadMasticGreenlawnRocky PointEast IslipSt. JamesNesconsetStony BrookManorvilleRidgePatchogueBabylonMount SinaiMiller PlaceLake GroveNorth LindenhurstElwoodMiddle IslandNorth BellportTerryvilleEast SetauketFort SalongaSouth HuntingtonSpringsBohemiaStony Brook UniversityPort Jefferson StationBaywoodEast ShorehamNorth PatchogueSound BeachOakdaleNorth SeaFlandersCenterportEast QuogueEast MorichesEast Hampton NorthCalvertonWheatley HeightsIslip TerraceWest BabylonCoramCentral Islip
Cities and towns served by area code 631

Who issues 631 numbers

Mobile 19%VoIP and cable 31%Landline 50%

Share of the 782 prefixes (the three digits after 631) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Verizon228
Verizon Business (MCImetro)65
T-Mobile55
Lumen (Level 3)55
Cablevision Lightpath55
AT&T Mobility49
Verizon Wireless44
Onvoy (Sinch)38

Cities and towns in area code 631

CityPopulationOther area codes
West Babylon43,239934
Coram41,527516, 934
Central Islip37,751516, 934
Commack36,353934
Huntington Station33,283934
Centereach31,501516, 934
Bay Shore31,275934
Shirley27,807934
Deer Park27,334934
Lindenhurst27,258934
West Islip26,559934
Holbrook26,256934
Medford25,681934
Dix Hills25,042934
Smithtown24,940934
Copiague23,332934
Selden21,707516, 934
East Patchogue21,364934
Hauppauge20,772934
North Bay Shore20,501934
North Amityville20,364934
Huntington20,117934
East Northport19,672934
Holtsville19,250934
Ronkonkoma18,368934
Lake Ronkonkoma18,289934
North Babylon18,208934
Islip17,224934
Hampton Bays17,138518, 838, 934
Farmingville16,605516, 934
Mastic Beach16,382934
Kings Park16,249934
Sayville15,593934
Riverhead15,073934
Mastic15,031934
Greenlawn14,986934
Rocky Point13,931934
East Islip13,687934
St. James13,680934
Nesconset13,344934

Showing the 40 largest of 74 places with 5,000+ residents.

Got a call from 631?

A 631 number was originally issued in New York, but that does not prove the caller is there. 31% of 631 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 782 prefixes in area code 631

Format: (631) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 631

Where is area code 631?
Area code 631 is in New York. It covers West Babylon, Coram, Central Islip, Commack, Huntington Station, Centereach and 68 more cities and towns.
What time zone is area code 631?
Area code 631 is in the Eastern time zone.
Is 631 a toll-free number?
No. 631 is a geographic area code in New York. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 631 share its area with 934?
631 and 934 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 631 run out of numbers?
NANPA's latest forecast projects the 631/934 overlay to exhaust in the third quarter of 2079. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in New York