Get a local business phone number in Belmont, MA

What area code is Belmont, MA?

Belmont town is a Census town in Middlesex County, Massachusetts, with an estimated 27,442 residents in 2024. NANPA lists 17 exchanges for its rate center across 2 area codes; 617 has the most (10, 59%). 617 is part of an overlay with 857, so a new local number in Belmont may carry any of those codes depending on which have numbers available. Belmont 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 Belmont phone exchanges

9 carriers hold the 17 exchanges assigned to Belmont's rate center. Verizon New England INC. has the most, with 6. 14 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Belmont can come from any of these blocks; once it is yours, porting lets it move between providers.

Local prefixes for Belmont

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Belmont. The earliest assignment date recorded in the file for these codes is 2001. 3 of the 17 were assigned in 2020 or later.

When Belmont's exchanges were assigned

Assignment dates show when each block of Belmont numbers was added to the local supply.

What makes a number local to Belmont

Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Belmont's numbers are rated to the BELMONT rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Belmont number.

New local numbers are drawn from carrier inventory, so the exact 617 numbers available change over time; porting an existing number is free.

Businesses around Belmont

Belmont 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).

A Belmont number on Callata

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

If you already have a number in Belmont, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.

The comparison below uses 20 users, the rounded average establishment size in the Boston, MA-NH metro area. At list prices checked September 28, 2026, that is $499.00 a month on Ooma Office Pro and $600.00 on RingCentral RingEX Core. On Callata the same 20 people cost $399.00 a month, less than either per-seat plan.