Massachusetts area codes
Massachusetts uses 9 area codes. The oldest is 413, in service since 1947; the newest is 857, from 2001. Across them 4,743 of 7,074 possible number blocks are allocated, 67.0% of capacity. 978, 781, 617 and 508 are at or past 95%, which is why new numbers there come from overlays rather than the original code. Verizon holds 42.6% of the 4,743 assigned blocks across the state, ahead of AT&T at 10.2%; a further 6.5% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named a Massachusetts caller ID 4,573 times – 2.0% of all complaints in the window, most often 774 with 907 (59th of 422 nationally). NANPA records 467 rate centers across the state's codes.
All 9 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 339 | 2001 | 105/786 | Verizon 24.8% | 160 | 781 |
| 351 | 2001 | 91/786 | Onvoy 30.8% | 222 | 978 |
| 413 | 1947 | 605/786 | Verizon 36% | 691 | no overlay |
| 508 | 1988 | 749/786 | Verizon 53% | 508 | 774 |
| 617 | 1947 | 768/786 | Verizon 56.6% | 427 | 857 |
| 774 | 2001 | 522/786 | Verizon 27.8% | 907 | 508 |
| 781 | 1997 | 769/786 | Verizon 46.7% | 371 | 339 |
| 857 | 2001 | 361/786 | Verizon 25.8% | 827 | 617 |
| 978 | 1997 | 773/786 | Verizon 44.5% | 460 | 351 |
Block share is share of allocated number blocks, not of subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and reflect spoofed caller IDs as much as real calls.
How full Massachusetts’s codes are
A code holds at most 786 blocks of 10,000 numbers each. When a code fills up, the administrator does not reclaim numbers – it adds an overlay, and from then on new numbers in the same area come from the new code.
Full or nearly full
Who holds the number blocks
Counted from every assigned block in the state: 4,743 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Massachusetts | Largest in |
|---|---|---|---|
| Verizon | 2,022 | 42.6% | 8 codes |
| AT&T | 484 | 10.2% | – |
| Windstream | 483 | 10.2% | – |
| T-Mobile | 482 | 10.2% | – |
| Lumen | 311 | 6.6% | – |
| Other CLEC / VoIP | 309 | 6.5% | – |
| Onvoy | 234 | 4.9% | 1 code |
| Bandwidth | 153 | 3.2% | – |
| Comcast | 127 | 2.7% | – |
| Peerless | 48 | 1% | – |
| Charter | 42 | 0.9% | – |
| American Messaging | 15 | 0.3% | – |
“Other CLEC / VoIP” is not one company: it is every holder outside the national carriers counted together, which is what resellers and app-based numbers look like in the records. This is allocation, not subscribers.
Spam complaints naming Massachusetts codes
FTC Do Not Call complaints where the caller ID shown was a Massachusetts number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are routinely faked, so these are complaints about the code, not calls proven to come from it.
| Code | Complaints | National rank |
|---|---|---|
| 774 | 907 | #59 of 422 |
| 857 | 827 | #91 of 422 |
| 413 | 691 | #133 of 422 |
| 508 | 508 | #208 of 422 |
| 978 | 460 | #223 of 422 |
What people said the calls were about
- Other – 183
- Reducing your debt (credit cards, mortgage, student loans) – 64
- Dropped call or no message – 63
- Calls pretending to be government, businesses, or family and friends – 57
Topics as the complainant chose them, for the codes where the FTC published a topic.
How Massachusetts got its codes
2 in the 1940s, 1 in the 1980s, 2 in the 1990s, 4 in the 2000s. Each code after the first was split off from or overlaid on one already in service.
- 1947 413 goes into service.
- 1947 617 goes into service.
- 1988 508 goes into service, split from or overlaid on 617.
- 1997 781 goes into service, split from or overlaid on 617.
- 1997 978 goes into service, split from or overlaid on 508.
- 2001 339 goes into service, split from or overlaid on 781.
- 2001 351 goes into service, split from or overlaid on 978.
- 2001 774 goes into service, split from or overlaid on 508.
- 2001 857 goes into service, split from or overlaid on 617.
Time zones
Massachusetts is in Eastern time.
Frequently asked about Massachusetts area codes
How many area codes does Massachusetts have?
9 in service. They are 339, 351, 413, 508, 617, 774, 781, 857 and 978.
What is the oldest area code in Massachusetts?
413, in service since 1947. Every later code in the state was split off from or overlaid on an existing one.
What is the newest area code in Massachusetts?
857, from 2001, overlaying 617.
Is Massachusetts running out of numbers?
978, 781, 617 and 508 are at or past 95% of capacity, but NANPA has not opened relief planning for them, so no new code is announced.
What time zone is Massachusetts in?
Eastern time.
Which Massachusetts area code gets the most spam complaints?
774 – 907 FTC complaints in the 33 days to 30 October 2026, 59th of 422 codes nationally. Those are complaints about the caller ID shown, and spam callers routinely fake a local-looking number, so this says the code is imitated often, not that the calls come from there.
Which carrier holds the most Massachusetts numbers?
Verizon, with 42.6% of the 4,743 blocks assigned across Massachusetts, ahead of AT&T at 10.2%. This is allocation of blocks by the numbering administrator, not a count of subscribers – people keep their numbers when they switch carriers.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Figures on this page are counted from those files, not copied from other sites. Spotted an error? Request a correction. How we collect and check: methodology.