🇺🇸 857 area code
Area code 857 covers Boston and the surrounding area in Massachusetts. It shares that territory with 617, so the same neighbourhood can have numbers in any of them. Enter an 857 number below for a free check before you call back.
- Location: Boston, Massachusetts
- Time zone: Eastern (UTC−5)
- In service since May 2, 2001
Nummer abfragen
Gültigkeit, Anbieter, Leitungstyp und Region im ersten Durchgang.
Area code 857 at a glance
Cities in area code 857
- Boston
Is a 857 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so an 857 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing an 857 number to people in Massachusetts because a local-looking call is more likely to be answered. If an 857 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 857
857 entered service on May 2, 2001, as an overlay on 617, which had run short of numbers.
It is part of the 617/857 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Area codes
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FAQ
Area code 857 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 857?
Area code 857 is in Massachusetts, United States. It covers Boston.
What time zone is area code 857?
857 is in the Eastern (UTC−5) time zone, and observes daylight saving time.
What area codes overlay 857?
617 serves the same area as 857. Numbers in all of them are local to one another.
When did area code 857 start?
857 entered service on May 2, 2001, created from 617.
How do I find out who called me from 857?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 857?
If you live in or near Massachusetts, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 857 callers who will not leave a message are best looked up before you call back.
Got a call from 857?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.