Chelsea, MA — rate center
- State
- Massachusetts
- Active prefixes
- 16
- Carriers
- 7
- Pooled prefixes
- 12
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
Chelsea 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.
NANPA records show 16 active prefixes here, held by 7 different carriers. Pooling applies to 12 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 Chelsea numbers can look completely different while being neighbors — check the prefix, not just the area code.
As always with US numbering: a prefix anchored to Chelsea tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.
Prefixes anchored to Chelsea
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-270 | METROPCS, INC. | Yes |
| 617-336 | PAETEC ITEL, LLC | Yes |
| 617-370 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-409 | PAETEC ITEL, LLC | Yes |
| 617-461 | METROPCS, INC. | Yes |
| 617-466 | COMCAST IP PHONE, LLC | Yes |
| 617-660 | VERIZON NEW ENGLAND INC. | No |
| 617-819 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-884 | VERIZON NEW ENGLAND INC. | No |
| 617-887 | VERIZON NEW ENGLAND INC. | No |
| 617-889 | VERIZON NEW ENGLAND INC. | No |
| 617-958 | ONVOY, LLC - MA | Yes |
FAQ
What area code is Chelsea, MA?
Chelsea is served by 2 area codes — 617, 857 — which overlay the same territory.
How many prefixes does Chelsea have?
16 active NXX prefixes are anchored to this rate center in NANPA records, held by 7 carriers.
Is a call from a Chelsea prefix really from Chelsea?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.