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AREA CODE · MASSACHUSETTS

Area code 857

Area code 857 covers Boston, Massachusetts. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Massachusetts Major City: Boston Eastern Time (ET) Overlay: 617/857
01 / WHERE IT IS

Where is area code 857?

Area code 857 is assigned to Boston and the surrounding region in Massachusetts. Calls to numbers that start with 857 are routed to this area.

Area code 857 shares its territory with 617. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

Suffolk CountyMiddlesex CountyNorfolk County

Line types

  • Mobile 42.7%
  • Landline 57.02%
02 / MAP

Area code 857 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Boston

This area code is in the Eastern Time (ET) time zone.

Local timeBoston, MA--:--:--

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America/New_YorkLive
04 / HOW TO DIAL

How to call Boston

WITHIN THE US857 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 857 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 857 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 857 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 857 555 0123
🇦🇺Australia0011 1 857 555 0123
🇯🇵Japan010 1 857 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 857

Share of the number blocks by carrier and line type.

Landline

Sinch
20%
Metro by T-Mobile
12%
Windstream Communications
9%
Verizon
7%
Lumen Technologies
7%
Others
45%

Mobile

Verizon Wireless
43%
T-Mobile USA
39%
AT&T Mobility
12%
Sinch
5%
Optimum
1%
Others
1%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 857

363 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(857) 200 Mobile Boston Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA
(857) 201 Landline Winthrop Metro by T-MobileMETROPCS, INC.
(857) 202 Mobile Boston Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA
(857) 203 Landline Jamaica Plain VerizonVERIZON NEW ENGLAND INC.
(857) 204 Mobile Boston T-Mobile USAOMNIPOINT MIAMI E LICENSE, LLC
(857) 205 Mobile Boston AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - DC
(857) 206 Mobile Boston Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA
(857) 207 Mobile Boston Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA
(857) 208 Mobile Boston Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA
(857) 209 Landline Cambridge Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - MA

Showing 10 of 363 prefixes

07 / FAQ

Frequently asked questions about area code 857

Where is area code 857 used?
Area code 857 serves Boston and the surrounding area in Massachusetts, including Suffolk County, Middlesex County, Norfolk County.
What city is area code 857 from?
The main city of area code 857 is Boston, MA.
What time zone is area code 857 in?
Area code 857 is in the Eastern Time (ET) time zone (America/New_York).
Is 857 an overlay area code?
Yes. It shares its territory with 617. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 857 from the United States?
Dial the 10 digits: 857 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 857 number from another country?
Dial your country's exit code (or +), then 1, then 857 and the seven-digit number. From a mobile you can use +1 857 XXX XXXX.
Which carriers use area code 857?
Most landline blocks belong to Sinch and most mobile blocks to Verizon Wireless. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 857 for landlines, mobiles or both?
Both. About 57.02% of the number blocks are landline, 42.7% mobile.
How do I save a 857 number in WhatsApp or my phone?
Save it in international format: +1 857 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 857?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

Nearby area codes

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Other area codes in Massachusetts

339 · Boston351 · Lowell413 · Springfield508 · Worcester617 · Boston774 · Worcester781 · Quincy978 · Lowell

View all Massachusetts area codes →