Somerville, MA — rate center
- State
- Massachusetts
- Active prefixes
- 29
- Carriers
- 14
- Pooled prefixes
- 22
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
The Somerville rate center (Massachusetts) anchors 29 active prefixes under area codes 617, 857. Rate centers, not city limits, are what phone numbers are legally tied to.
29 central-office prefixes are currently anchored to this rate center across 14 carriers. 22 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
The rate center belongs to the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. Routing-wise it sits in LATA 128.
Multiple area codes over one rate center (617/857) is the overlay pattern: same geography, different first three digits.
Treat this data as geography of the number, not of the caller: porting, VoIP and caller-ID spoofing all detach the two. When a call matters, hang up and call back through an official number.
Prefixes anchored to Somerville
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-284 | VERIZON NEW ENGLAND INC. | Yes |
| 617-440 | PAETEC ITEL, LLC | Yes |
| 617-501 | METROPCS, INC. | Yes |
| 617-591 | VERIZON NEW ENGLAND INC. | Yes |
| 617-616 | TC SYSTEMS, INC. | Yes |
| 617-623 | VERIZON NEW ENGLAND INC. | No |
| 617-625 | VERIZON NEW ENGLAND INC. | No |
| 617-627 | VERIZON NEW ENGLAND INC. | No |
| 617-628 | VERIZON NEW ENGLAND INC. | No |
| 617-629 | VERIZON NEW ENGLAND INC. | No |
| 617-666 | VERIZON NEW ENGLAND INC. | No |
| 617-684 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-702 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-718 | RCN TELECOM SERVICES, INC. - MA | Yes |
| 617-741 | LEVEL 3 COMMUNICATIONS, LLC - MA | Yes |
| 617-764 | COMCAST IP PHONE, LLC | Yes |
| 617-767 | METROPCS, INC. | Yes |
| 617-776 | VERIZON NEW ENGLAND INC. | No |
| 617-863 | VERIZON NEW ENGLAND INC. | Yes |
| 617-941 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-996 | LEVEL 3 COMMUNICATIONS, LLC - MA | Yes |
FAQ
What area code is Somerville, MA?
Somerville is served by 2 area codes — 617, 857 — which overlay the same territory.
How many prefixes does Somerville have?
29 active NXX prefixes are anchored to this rate center in NANPA records, held by 14 carriers.
Is a call from a Somerville prefix really from Somerville?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.