Area codes · +1
Area code 351
Area code 351 is centred on Acton, Massachusetts. We hold 836 allocated blocks for it across 44 rate centres, split 33% mobile, 29% landline and 38% VoIP.
The other area codes laid over 351
Area code 351 does not have Acton to itself. 1 other code — 978 — serves the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
9786,597 blocks, 58 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 351 number and a 978 number from the same street can report different line types. Filtering Acton by area code needs all 2 of them.
351 is not confined to Acton itself: its blocks sit across 44 rate centres, named in the table below.
Massachusetts is split across 9 area codes — 978, 781, 774, 508, 413, 351 and others. By allocated blocks 351 is the 9th largest of them, holding 2% of the Massachusetts total.
Where 351 numbers are concentrated
Rate-centre names are reproduced as NANPA records them. The agency truncates them to ten characters, so longer names appear shortened elsewhere on this site.
| Rate centre | Blocks | Share of 351 |
|---|---|---|
| Acton | 65 | 8% |
| Lowell | 55 | 7% |
| Haverhill | 44 | 5% |
| Lawrence | 44 | 5% |
| Danvers | 38 | 5% |
| Merrimac | 33 | 4% |
| Georgetown | 32 | 4% |
| Peabody | 32 | 4% |
| Gloucester | 31 | 4% |
| Ipswich | 28 | 3% |
| Harvard | 26 | 3% |
| Ashby | 24 | 3% |
| Amesbury | 22 | 3% |
| Hudson | 21 | 3% |
| Leominster | 21 | 3% |
| Pepperell | 20 | 2% |
| Templeton | 20 | 2% |
| Manchester | 19 | 2% |
| Lunenburg | 15 | 2% |
| Tyngsboro | 15 | 2% |
| Hubbardstn | 14 | 2% |
| Rockport | 14 | 2% |
| Westford | 14 | 2% |
| Hamilton | 12 | 1% |
20 further rate centres in 351 hold fewer blocks than these.
Carriers holding the most 351 blocks
Onvoy310 blocks
Onvoy Spectrum81 blocks
Omnipoint Miami E License, Llc63 blocks
Verizon Wireless44 blocks
T-Mobile USA, Inc.40 blocks
Commio, Llc29 blocks
Onvoy alone holds 37% of every block in 351, which is unusually concentrated for an area code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 351 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 351 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 351?
Area code 351 covers Acton, Massachusetts. It is not the only code there: 978 is an overlay on the same rate centres, so a Acton, Massachusetts number can start with any of them.
Is a 351 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 351 the split runs 33% mobile, 29% landline and 38% VoIP, so VoIP is the most likely single answer.
Which carriers hold 351 numbers?
The largest holders are Onvoy, Onvoy Spectrum, Omnipoint Miami E License, Llc. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 351 numbers are there?
The code holds 836 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 351 covers on the order of 836,000 possible numbers — most of which have never been issued to anyone.