Question 1

Where is area code 857?

Accepted Answer

Area code 857 covers Boston and nearby cities including Cambridge, Quincy, Newton in Massachusetts, in the Eastern Time.

Question 2

What cities use area code 857?

Accepted Answer

Area code 857 serves Boston, Cambridge, Quincy, Newton, Somerville, and 7 other communities in Massachusetts.

Question 3

What time zone is area code 857 in?

Accepted Answer

Area code 857 is in the Eastern Time (America/New_York).

Question 4

How do you dial a 857 number?

Accepted Answer

Dial all 10 digits: 857 followed by the 7-digit local number. From abroad, dial +1 857 and the local number.

Question 5

Is a call from area code 857 a scam?

Accepted Answer

A 857 number is geographically tied to Massachusetts, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Question 6

Is 857 a country code?

Accepted Answer

No. 857 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 857 number written for international dialing looks like +1 857 followed by the 7-digit local number.

Area Code 857

Cities in area code 857

Area codes by city

Carriers in area code 857

Other Massachusetts area codes

Nearby area codes