Everything you need to know about area code 857 in Massachusetts
QUICK FACTS
Massachusetts
Eastern Time Zone
Overlay code
Estimated residents served
Massachusetts
Shares territory with existing code
ABOUT THIS AREA CODE
Area code 857 is an overlay for Boston and Cambridge, sharing territory with the historic 617 area code. It serves the city's colleges, hospitals, and technology companies.
Phone numbers with the 857 area code follow the format (857) XXX-XXXX, where the next three digits represent the local exchange. The 857 area code is part of the North American Numbering Plan (NANP) and is regulated by the Federal Communications Commission (FCC).
If you receive a call from a 857 number that you don't recognize, you can search it using the lookup tool above. While the 857 area code legitimately serves millions of residents and businesses in the Boston area, scammers sometimes spoof local area codes to make their calls appear more trustworthy. Always verify unfamiliar numbers before returning calls or sharing personal information.
The Boston region served by area code 857 is one of the most significant areas in Massachusetts. As an overlay code, 857 shares its geographic territory with other area codes in the region, meaning all local calls require 10-digit dialing.
For detailed information about any phone number in the 857 area code, including owner identification, carrier data, and spam reports, use our search tool above or visit one of our trusted lookup providers.
CITIES & COMMUNITIES
SPAM & SCAM ALERTS
These are frequently reported scam patterns from phone numbers using the 857 area code. Scammers often spoof area codes, so a call appearing to come from 857 may originate elsewhere.
Callers claim your Social Security number has been suspended due to suspicious activity and demand personal information to reactivate it.
Robocalls claim your car warranty is expiring and pressure you into purchasing expensive and unnecessary extended coverage.
Callers impersonate your electric or gas company, threatening immediate service disconnection unless payment is made by phone.
Stay Safe: Never share personal information with incoming callers. If suspicious, hang up and search the number above.
FREQUENTLY ASKED QUESTIONS
Area code 857 serves Boston, Massachusetts. Area code 857 is an overlay for Boston and Cambridge, sharing territory with the historic 617 area code. It serves the city's colleges, hospitals, and technology companies.
Area code 857 is in the Eastern timezone. Calls from 857 numbers originate from the Boston region.
Not necessarily. Area code 857 serves many people in Boston. However, scammers can spoof any area code. If you receive a suspicious call from a 857 number, search it above before calling back.
Area code 857 was created in 2001. It is an overlay code sharing territory with an existing area code.
WHO CALLED ME
If you received an unknown call from a 857 number, use our dedicated lookup page to identify the caller and check for scam reports.
Who Called Me From 857? →