617 Area CodeBoston, MA
Area code 617 covers Boston and nearby communities in Massachusetts, in the Eastern Time (ET) zone, home to about 1.3 million people across 12 cities. It overlays 857, so the same region uses both and every local call needs all ten digits.
Where is area code 617?
Area code 617 serves part of Boston, MA and the surrounding areas. It has a single overlay (857) that serves the same area.
Overview of the 617 Area Code
What is the 617 area code?
The 617 area code serves Boston, Massachusetts, alongside other established area codes. When you see a 617 number, it indicates a local number within this geographic area.
Why was area code 617 created?
The 617 area code was introduced as an overlay to add numbers in Boston once the existing area code 857 began to run out of available prefixes. It added a new supply of numbers without requiring current residents to change their existing digits.
Geographic Coverage of the 617 Area Code
The 617 area code serves Boston and surrounding areas in Massachusetts. It operates within the Eastern Time (ET) time zone. It complements the coverage of area code 857. This area code covers several key cities, including:
- Boston
- Cambridge
- Quincy
- Newton
- Somerville
- Brookline
Got a call from a 617 number? It came from Boston, MA. Since 617 overlays with 857, every local call in the region needs all ten digits to land on the right line. Inside 617, Boston holds about 51% of the population; the rest is split across 11 smaller cities.
Boston Area Codes Overview
Boston is served by multiple area codes, reflecting its telecommunications needs. The 617 area code operates alongside 857. Here are the area codes serving this region:
The introduction of the 617 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 617 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Boston | MA | 673,458 | 37% | 65% |
| Cambridge | MA | 121,186 | 4% | 100% |
| Quincy | MA | 103,434 | 17% | 100% |
| Newton | MA | 90,700 | 11% | 100% |
| Somerville | MA | 82,149 | 3% | 99% |
| Brookline | MA | 58,732 | 4% | 100% |
| Everett | MA | 51,825 | 2% | 99% |
| Chelsea | MA | 40,245 | 2% | 100% |
| Watertown Town | MA | 31,915 | 3% | 100% |
| Milton | MA | 27,003 | 8% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 617 been reported for unwanted calls?
Yes – 714 unwanted-call complaints were reported to the FTC for numbers showing a 617 area code (May 29 – Jul 2, 2026).
- 63% robocalls
- ↑ 8% vs prior period
Most-reported subjects
- Other39%282
- Reducing your debt (credit cards, mortgage, student loans)29%206
- Home improvement & cleaning10%68
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 617?
76% assigned to a telco
- 81% Landline
- 19% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (617)201- | Wireless | Sprint Spectrum |
| (617)202- | Landline | Conversent Communications Of Massachusetts |
| (617)203- | Landline | Xo Massachusets |
| (617)204- | Landline | Verizon New England |
| (617)205- | Landline | Norfolk County Internet |
| (617)206- | Landline | Mcimetro Access Transmission Services |
| (617)207- | Landline | Comcast Ip Phone |
| (617)208- | Landline | Xo Massachusets |
| (617)209- | Landline | Rcn Telecom Services |
| (617)210- | Landline | Verizon New England |
Frequently Asked Questions about the 617 Area Code
Who called me from a 617 number?
A 617 number is assigned to Boston, Massachusetts, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 617 code to look nearby, so a 617 number doesn't prove the caller is local. Recently, 714 unwanted-call complaints were reported to the FTC for numbers showing the 617 code (63% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 617 a scam area code?
No area code is a scam on its own. 617 is a normal, officially assigned code for Boston, Massachusetts. Spam callers spoof local codes to raise the odds you answer, so 617 on your caller ID says nothing about who is really calling. Recently, 714 unwanted-call complaints were reported to the FTC for numbers showing the 617 code (63% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 617 area code?
Repeated calls from different 617 numbers are usually spoofing: a robocaller rotates through 617 numbers so each call looks local and slips past simple blocks. Recently, 714 unwanted-call complaints were reported to the FTC for numbers showing the 617 code (63% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 617 number?
If you aren't expecting a 617 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 617 area code?
Block a single 617 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 617 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 617?
Area code 617 covers Boston and the surrounding area in Massachusetts, spanning 12 cities with about 1,324,115 residents. It shares its area with overlay code 857.
Is 617 a real area code?
Yes. 617 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Boston, Massachusetts. A real code can still show up on spoofed spam calls, so treat unknown 617 calls with normal caution.
What timezone is the 617 area code in?
The 617 area code is in the Eastern Time (ET). Because a number can be kept when someone moves or switches to VoIP, a specific 617 caller may not be in that zone.
How do I call a 617 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 617 and the seven-digit number. From a mobile phone you can usually just enter +1 617 followed by the number and let the phone add the exit code for you.