Area Code for Boston

Boston city proper runs on 617 and its 2001 overlay 857. If your call rings in Back Bay, Beacon Hill, Cambridge, or Somerville, it is almost certainly a 617 or 857 number.

The wider metro tells a more layered story. The Route 128 corridor — America’s original technology highway — runs through the 781/339 footprint. The South Shore, Cape Cod approach, and the Worcester belt fall under 508/774. The North Shore and Merrimack Valley belong to 978/351.

For businesses, knowing which code maps to which geography is a local-presence decision, not just a trivia question.

What’s the area code for Boston?

Boston uses two area codes that share the same geographic boundary:

Code	Established	Coverage	Notes
617	1947	Boston, Cambridge, Brookline, Newton, Quincy, Somerville	Original NANP code; highest prestige
857	2001	Same as 617	Overlay; introduced when 617 pool ran low

Both codes ring the same cities and neighborhoods. The only meaningful difference is age: a 617 number predates May 2001.

The 617/857 numbering plan area (NPA) covers portions of four counties: Essex, Middlesex, Norfolk, and Suffolk.

As of October 2025, the combined 617/857 pool is projected to last until 2059, according to NANPA exhaustion modeling.

Greater Boston metro area codes

Boston’s metro extends well beyond city limits. Here are the codes for the full Greater Boston footprint:

Code	Established	Type	Key Cities
617	1947	Original	Boston, Cambridge, Brookline
857	2001	Overlay (617)	Same geography as 617
781	1997	Split from 617	Waltham, Lynn, Malden, Braintree, Needham
339	2001	Overlay (781)	Same geography as 781
508	1988	Split from 617	Brockton, New Bedford, Cape Cod approach, Worcester
774	2001	Overlay (508)	Same geography as 508
978	1997	Split from 617	Lowell, Lawrence, Haverhill, Salem, Gloucester
351	2001	Overlay (978)	Same geography as 978

Western Massachusetts uses a separate code — 413 (Springfield, Pittsfield, Amherst) — which is outside the Greater Boston metro.

Boston area codes by neighborhood and suburb

Back Bay and Beacon Hill — The historic core of Boston proper, including Boylston Street (site of the Boston Marathon finish line) and Newbury Street. Area codes: 617, 857.

Cambridge — Across the Charles River from Boston, Cambridge is home to MIT and Harvard, plus a dense biotech and venture-capital corridor along Kendall Square and Mass Ave. Area codes: 617, 857.

Brookline — Immediately west of Boston, Brookline is an independent town within the 617/857 coverage area. The John F. Kennedy birthplace (83 Beals Street) is here. Area codes: 617, 857.

Somerville — Directly north of Cambridge, Somerville is home to Davis Square and Assembly Row. Area codes: 617, 857.

Newton — On the western edge of the 617/857 zone, Newton borders the Route 128 corridor. Area codes: 617, 857.

Quincy — South of Boston, Quincy (the “City of Presidents”) is the southernmost city in the 617/857 footprint. Area codes: 617, 857.

Waltham, Needham, Dedham, Braintree — These Route 128 corridor towns fall under the 781/339 pair. They form the suburban technology ring that once earned Route 128 the nickname “America’s Technology Highway.”

Brockton, Plymouth, New Bedford — South Shore and southeastern MA communities use 508/774.

History of Boston area codes

Boston’s area code history is essentially a story of growth outpacing infrastructure — four times over.

1947 — The North American Numbering Plan launched with 86 area codes. Massachusetts was split between 413 (western MA) and 617 (eastern MA, including Boston). On rotary phones, 617 was a moderately fast dial — no coincidence for a major metro.

July 1988 — The combined growth of Worcester County, the Merrimack Valley, the South Coast, and Cape Cod pushed the 617 pool toward exhaustion. NANPA carved out 508 to cover the non-Boston portions of eastern MA. Boston kept 617.

September 1997 — Boston’s inner-ring suburbs — Waltham, Lynn, Malden, the Route 128 corridor — were split into a new code, 781. This made 617 largely coextensive with Boston proper and its closest neighbors.

May 2, 2001 — Three overlay codes activated simultaneously across Massachusetts. 857 overlaid 617 (Boston). 339 overlaid 781 (suburbs). 10-digit local dialing became mandatory statewide. The same pattern was applied to 508 (→ 774) and 978 (→ 351).

The simultaneous 2001 overlay activation is notable: Massachusetts converted the entire eastern half of the state to mandatory 10-digit dialing in a single coordinated switch, a logistical feat that few states attempted all at once.

617 as Boston identity

In most cities, an area code is a routing number. In Boston, 617 is a cultural artifact.

The Red Sox introduced City Connect jerseys in 2021 that prominently feature the digits. The design mimics a marathon racing bib — yellow and blue, the colors of the Boston Marathon — and debuted during Patriots’ Day weekend games at Fenway Park.

The connection to the marathon is not accidental. After the April 15, 2013 bombing on Boylston Street, “Boston Strong” emerged as a rallying phrase. The 617 area code became embedded in the solidarity movement: a shorthand for the city’s identity and its refusal to be defined by the attack.

Sports franchises reinforce the code’s civic weight. The Celtics, Bruins, Red Sox, and Patriots have combined for 41 league championships — and every one of those organizations answers a 617 or 857 phone. For fans, that code carries the same weight as a Fenway Park address.

Cambridge deepens the identity layer. MIT alumni-founded companies generate an estimated $2 trillion in annual revenue globally. Harvard, founded in 1636, holds a $56.9 billion endowment. Both institutions operate inside the 617/857 footprint, which means the area code is also associated with one of the world’s highest concentrations of intellectual and research capital.

For a business setting up a Boston presence, a 617 number signals that you belong to this particular ecosystem — not just that you have a Massachusetts phone line.

Boston area code spam and scams

Massachusetts — and the 617/857 geography specifically — produces several distinct phone fraud patterns worth knowing.

IRS impersonation calls using spoofed 617 numbers exploit the financial-services authority of downtown Boston. State Street, Fidelity, and other major asset managers are headquartered in 617, so a call appearing to originate from a Boston financial institution carries false credibility.

Biotech investment fraud targets individuals in the Cambridge corridor. A spoofed 617 or 857 number paired with a pitch about a Cambridge biotech startup is a known pattern, particularly during periods of IPO activity.

University tuition scams target families of students at Harvard, MIT, Boston University, Tufts, and Northeastern. Fraudsters use spoofed 617 numbers to impersonate university financial aid or bursar offices.

The FCC’s spoofing and caller ID guide is the authoritative reference: caller ID is not authentication. A 617 number on your screen does not mean the call originates from Boston.

The industry’s answer is STIR/SHAKEN — a cryptographic framework that lets originating carriers attest to the legitimacy of a call’s number. A-attestation (the highest level) means the carrier has confirmed the calling party is authorized to use that number.

DialPhone numbers in the 617 and 857 codes are registered for STIR/SHAKEN A-attestation. Outbound calls from DialPhone numbers are less likely to appear as Spam Likely on recipient phones — which matters for sales teams and customer-service operations calling into a market as crowded as Boston.

How to get a Boston business phone number

Getting a 617 or 857 number through DialPhone takes under 10 minutes:

1. Create a DialPhone account at dialphone.com/pricing. Month-to-month plans available; no annual contract required.
2. Search number inventory. Filter by area code — enter 617 for historical Boston presence, 857 for availability, or 781/339 for the Route 128 suburb corridor.
3. Select your number. Choose from available inventory. Memorable or sequential patterns can be searched by number format.
4. Port your existing number (optional). Submit a Letter of Authorization and a recent phone bill. Boston area code porting (617, 857, 781, 339) typically completes in 2–5 business days based on DialPhone’s port volume data. See the complete number porting guide.
5. Configure call routing. Route to your team, activate AI receptionist for after-hours, and enable SMS — all from the same dashboard.

Your business phone is active as soon as the number is assigned.

Famous companies in Boston area codes

Boston’s 617 and 857 codes carry some of the most recognizable corporate names in American finance, technology, and healthcare.

Fidelity Investments — headquartered on Boylston Street in Boston, one of the world’s largest asset managers with over $13 trillion in assets under administration. Fidelity’s main Boston line has carried a 617 prefix since the company’s founding.

State Street Corporation — one of the largest custody banks globally, headquartered in Boston’s Financial District. State Street serves as custodian for more than $40 trillion in assets.

Boston Consulting Group (BCG) — the global strategy consultancy was founded in Boston in 1963 and maintains its headquarters in the 617 footprint.

Wayfair — the e-commerce furniture and home goods company is headquartered in Boston, making it one of the city’s largest tech employers.

Liberty Mutual Insurance — headquartered in Boston, Liberty Mutual is one of the largest property and casualty insurers in the United States.

Akamai Technologies — founded at MIT and headquartered in Cambridge, Akamai powers a significant portion of global internet traffic delivery.

Moderna — the mRNA biotech company is headquartered in Cambridge, inside the 617/857 zone. Moderna’s COVID-19 vaccine was developed and initially manufactured within this area code.

All of these organizations operate on 617 or 857 lines — reinforcing why the codes carry weight for businesses that want to signal a Boston anchor.

See all Massachusetts area codes or look up specific codes: 617 · 857.

Boston area code FAQ

Boston area code FAQ

What is the area code for Boston? +

Boston's primary area code is **617**, established in 1947. Area code **857** was added in 2001 as an overlay — both codes serve the same geographic area, which includes the city of Boston, Cambridge, Brookline, Newton, Quincy, and Somerville.

Greater Boston also spans codes 781 and 339 (inner suburbs), 508 and 774 (South Shore and southeastern MA), and 978 and 351 (North Shore and Merrimack Valley).

What is the difference between 617 and 857? +

617 and 857 cover the exact same geography — there is no geographic distinction. 617 was established in 1947 and carries historical weight. 857 was overlaid in 2001 when the 617 number pool began running low.

A 617 number signals that a business or individual has had a Boston presence since before 2001. An 857 number is equally local but is more common for newer lines, mobile numbers, and VoIP accounts.

What area code is Cambridge, MA? +

Cambridge, Massachusetts uses area codes **617** and **857** — the same pair as Boston proper. MIT and Harvard both operate within the 617/857 numbering plan area.

Cambridge is one of the most recognized cities in the 617/857 footprint, home to a dense concentration of biotech firms, venture capital offices, and research institutions.

What area code is Quincy, MA? +

Quincy, Massachusetts uses area codes **617** and **857**. Despite being south of Boston city limits, Quincy falls within the same NPA as Boston.

Quincy is sometimes called the City of Presidents — it is the birthplace of John Adams and John Quincy Adams — and has a large, established Korean-American community.

What area code is Newton, MA? +

Newton, Massachusetts is served by area codes **617** and **857**. Newton is on the western edge of the 617/857 coverage area, adjacent to the Route 128 tech corridor, which is covered by 781 and 339.

Is 617 a scam area code? +

617 is not inherently a scam area code — it is a legitimate Boston area code. However, scammers frequently **spoof** 617 numbers to appear local and trustworthy.

Common patterns include IRS impersonation calls using a spoofed 617 number (leveraging the financial-services authority of downtown Boston), biotech investment fraud targeting the Cambridge corridor, and university tuition scams aimed at families of students at Harvard, MIT, BU, and Northeastern.

STIR/SHAKEN A-attestation is the industry standard for verifying a call actually originates from the number displayed.

How do I get a Boston 617 or 857 business number? +

You can get a 617 or 857 number through a VoIP provider like DialPhone without a Boston address. The process takes under 10 minutes: sign up, search available inventory by area code, select a number, and optionally port an existing number.

DialPhone 617 and 857 numbers are registered for STIR/SHAKEN A-attestation, which means outbound calls are verified at the carrier level and less likely to be flagged as Spam Likely.

What is the 781 area code? +

Area code 781 serves Boston's inner suburbs — the Route 128 corridor including towns like Waltham, Needham, Dedham, Braintree, Lynn, and Malden. It was split from 617 in 1997 when the inner-ring suburbs required a separate pool.

Overlay code 339 serves the same geography as 781 and was introduced in 2001 simultaneously with 857.

Get a Boston business number

Whether you need a 617 area code for historical Boston presence or an 857 area code for availability, DialPhone has inventory across both active Boston codes.

Numbers are provisioned instantly, include STIR/SHAKEN A-attestation, and come with an AI receptionist, call recording, and SMS on every plan.

Start with a free trial to search available 617 and 857 numbers, or see the full business phone feature set and pricing options.