Watertown, MA — rate center
- State
- Massachusetts
- Active prefixes
- 21
- Carriers
- 12
- Pooled prefixes
- 17
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
In NANP numbering, Watertown, Massachusetts is a rate center — the anchor point for local numbers. It is reached through 617, 857 (multiple area codes serve it).
21 central-office prefixes are currently anchored to this rate center, held by 12 different carriers. Pooling applies to 17 of them — individual thousands-blocks may belong to different companies.
The rate center belongs to the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. Routing-wise it sits in LATA 128.
Because 617, 857 all serve this territory, two Watertown numbers can look completely different while being neighbors — check the prefix, not just the area code.
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 Watertown
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-231 | LEVEL 3 COMMUNICATIONS, LLC - MA | Yes |
| 617-321 | PAETEC ITEL, LLC | Yes |
| 617-393 | RCN TELECOM SERVICES, INC. - MA | Yes |
| 617-402 | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | Yes |
| 617-458 | METROPCS, INC. | Yes |
| 617-600 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-607 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-612 | TC SYSTEMS, INC. | Yes |
| 617-668 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-673 | VERIZON NEW ENGLAND INC. | Yes |
| 617-744 | COMCAST IP PHONE, LLC | Yes |
| 617-923 | VERIZON NEW ENGLAND INC. | No |
| 617-924 | VERIZON NEW ENGLAND INC. | No |
| 617-926 | VERIZON NEW ENGLAND INC. | No |
| 617-972 | VERIZON NEW ENGLAND INC. | No |
FAQ
What area code is Watertown, MA?
Watertown is served by 2 area codes — 617, 857 — which overlay the same territory.
How many prefixes does Watertown have?
21 active NXX prefixes are anchored to this rate center in NANPA records, held by 12 carriers.
Is a call from a Watertown prefix really from Watertown?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.