Prefix 617-345 — Boston, MA

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

617-345 identifies a block of numbers in Boston, MA, within the 617 area code. Every US prefix is tied to exactly one rate center; this one is Boston.

The rate center lies in the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. The serving LATA is 128. Local time follows the Eastern zone.

Treat the on-screen number as a hint, not evidence — 617-345 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.

NANPA's central-office code records list VERIZON NEW ENGLAND INC. (OCN 9102) as the code holder. Because 617-345 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.

Neighboring prefixes

FAQ

Where is 617-345 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 617-345 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 617-345 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.