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857 Area Code

Area code 857 serves Boston, Cambridge, Quincy, Newton, Somerville and nearby communities in Massachusetts. It has been in service since May 2, 2001, when it was split from 617.

StateMassachusetts
Time zoneEastern
Local time now…
Prefixes in use363
Overlay with617
Projected to run out2066
BostonCambridgeQuincyNewtonSomervilleBrooklineEverettChelseaWatertownMiltonBelmontWinthrop TownBostonMilton
Cities and towns served by area code 857

Who issues 857 numbers

Mobile 41%VoIP and cable 30%Landline 29%

Share of the 363 prefixes (the three digits after 857) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Verizon Wireless67
T-Mobile61
Onvoy (Sinch)49
Metropcs25
Paetec Itel19
AT&T Mobility18
Verizon14
Verizon Business (MCImetro)13

Cities and towns in area code 857

CityPopulationOther area codes
Boston672,973617
Cambridge122,588617
Quincy103,173617
Newton90,741617
Somerville84,211617
Brookline62,822617
Everett53,572617
Chelsea40,130617
Watertown35,710617
Milton28,481617
Belmont27,009617
Winthrop Town18,647617

Got a call from 857?

A 857 number was originally issued in Massachusetts, but that does not prove the caller is there. 30% of 857 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 363 prefixes in area code 857

Format: (857) 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 857

Where is area code 857?
Area code 857 is in Massachusetts. It covers Boston, Cambridge, Quincy, Newton, Somerville, Brookline and 6 more cities and towns.
What time zone is area code 857?
Area code 857 is in the Eastern time zone.
Is 857 a toll-free number?
No. 857 is a geographic area code in Massachusetts. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 857 share its area with 617?
617 and 857 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 857 run out of numbers?
NANPA's latest forecast projects the 617/857 overlay to exhaust in the third quarter of 2066. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Massachusetts