Get a local business phone number in Cambridge, MA

Cambridge area codes

Cambridge, in Middlesex County, Massachusetts, had a Census-estimated population of 121,186 in July 2024. NANPA lists 140 exchanges for its rate center across 3 area codes; 617 has the most (111, 79%). 617 is part of an overlay with 857, so a new local number in Cambridge may carry any of those codes depending on which have numbers available. Cambridge is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 617 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Who holds Cambridge phone exchanges

25 carriers hold the 140 exchanges assigned to Cambridge's rate center. Verizon New England INC. has the most, with 47. 88 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.

Local prefixes for Cambridge

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Cambridge's rate center (CAMBRIDGE). The earliest assignment date recorded in the file for these codes is 2001. 3 of the 140 were assigned in 2020 or later.

When Cambridge's exchanges were assigned

The table groups Cambridge's exchanges by the decade NANPA recorded them as assigned.

Rate centers and local calling in Cambridge

What a caller sees as "local" is the area code plus prefix. In Cambridge, those come from the CAMBRIDGE rate center, as recorded by NANPA.

If your business already has a Cambridge number, porting it to Callata is free and keeps it on your cards, listings and vehicles.

Businesses around Cambridge

Cambridge is part of the Boston-Cambridge-Newton, MA-NH metro area, home to 5.0 million people in 2024. County Business Patterns counted 133,807 business establishments in the Boston, MA-NH metro area in 2023, employing 2,681,704 people. The largest sectors by establishment count are professional, scientific, and technical services (17,803), retail trade (15,568), and health care and social assistance (15,127).

Setting up a Cambridge business line

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in Cambridge is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.

A 20-person team is the benchmark here, the rounded average establishment size in the Boston, MA-NH metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $600.00 a month and Ooma Office Pro $499.00. Callata comes to $399.00 a month for 20 users ($99 a month with 5 users included, then $20 per additional user), below both.