Belmont, MA — rate center
- State
- Massachusetts
- Active prefixes
- 17
- Carriers
- 9
- Pooled prefixes
- 14
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
Belmont is a telephone rate center in Massachusetts served by area codes 617, 857. A rate center is the locality the phone industry uses to anchor numbers for billing; every prefix listed below is registered here.
17 central-office prefixes are currently anchored to this rate center, held by 9 different carriers. Pooling applies to 14 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 Belmont 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 Belmont
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-209 | RCN TELECOM SERVICES, INC. - MA | Yes |
| 617-484 | VERIZON NEW ENGLAND INC. | No |
| 617-486 | VERIZON NEW ENGLAND INC. | No |
| 617-489 | VERIZON NEW ENGLAND INC. | No |
| 617-826 | LEVEL 3 COMMUNICATIONS, LLC - MA | Yes |
| 617-855 | VERIZON NEW ENGLAND INC. | Yes |
| 617-883 | VERIZON NEW ENGLAND INC. | Yes |
| 617-932 | TC SYSTEMS, INC. | Yes |
| 617-977 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-993 | VERIZON NEW ENGLAND INC. | Yes |
FAQ
What area code is Belmont, MA?
Belmont is served by 2 area codes — 617, 857 — which overlay the same territory.
How many prefixes does Belmont have?
17 active NXX prefixes are anchored to this rate center in NANPA records, held by 9 carriers.
Is a call from a Belmont prefix really from Belmont?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.