Area code 857 — Massachusetts
Area code 857 is in Massachusetts and serves Boston. Time zone, overlays, counties and ZIP codes.
| Location | East-central Massachusetts, including Boston |
|---|---|
| Main places | Boston |
| State | Massachusetts |
| Status | In service · since 2001 |
| Time zone | Eastern · |
| Overlay codes | 617 Overlays share the same area. Local calls usually need 10-digit dialing. |
| Local dialing | 10 digits |
History
- Overlaid on 617
Counties (approximate)
MiddlesexMiddlesex CountyNorfolkNorfolk CountyPlymouthPlymouth CountySuffolkSuffolk CountyWorcester County
ZIP codes in area code 857
Approximate: area code boundaries follow telephone rate centers, not ZIP codes.
01504 Blackstone01529 Millville01756 Mendon02019 Bellingham02021 Canton02026 Dedham02027 Dedham02030 Dover02032 East Walpole02038 Franklin02044 Hingham02045 Hull02052 Medfield02053 Medway02054 Millis02056 Norfolk02062 Norwood02071 South Walpole02081 Walpole02090 Westwood02108 Boston02109 Boston02110 Boston02111 Boston02112 Boston02113 Boston02114 Boston02115 Boston02116 Boston02117 Boston02118 Boston02119 Roxbury02120 Roxbury Crossing02121 Dorchester02122 Dorchester02123 Boston02124 Dorchester Center02125 Dorchester02126 Mattapan02127 Boston
Format a 857 number
US numbers are written as (857) 555-0123 or 857-555-0123. From outside the US, dial +1 857 555 0123.
Is a call from 857 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.