Prefix 617-366 — Boston, MA

NANPA CO code assignment, current as of July 28, 2026.

The 617-366 prefix belongs to area code 617 and is anchored to the Boston rate center (MA). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.

Boston is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. For routing purposes it sits in LATA 128. Numbers here keep Eastern time.

The assigned code holder is VERIZON NEW ENGLAND INC., operating company number 9102, assigned May 6, 2004. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.

Caller ID showing 617-366 is not proof the call came from Boston: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.

Neighboring prefixes

FAQ

Where is 617-366 located?

The prefix is assigned to the Boston rate center in MA, area code 617. It is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area.

Which company owns 617-366 numbers?

VERIZON NEW ENGLAND INC. holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.

Is a call from 617-366 safe to answer?

The prefix itself says nothing about the caller. Legitimate Boston businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.