Charlestown, MA — rate center
- State
- Massachusetts
- Active prefixes
- 23
- Carriers
- 9
- Pooled prefixes
- 19
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
Phone numbers "from Charlestown" are, precisely speaking, numbers whose prefixes are anchored to the Charlestown rate center of Massachusetts, under 617, 857.
NANPA records show 23 active prefixes here across 9 carriers. 19 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.
As always with US numbering: a prefix anchored to Charlestown 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 Charlestown
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-241 | VERIZON NEW ENGLAND INC. | No |
| 617-242 | VERIZON NEW ENGLAND INC. | No |
| 617-286 | PAETEC ITEL, LLC | Yes |
| 617-337 | RCN TELECOM SERVICES, INC. - MA | Yes |
| 617-380 | LEVEL 3 COMMUNICATIONS, LLC - MA | Yes |
| 617-398 | BANDWIDTH.COM CLEC, LLC - MA | Yes |
| 617-518 | ONVOY, LLC - MA | Yes |
| 617-580 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-669 | OMNIPOINT MIAMI E LICENSE, LLC | No |
| 617-681 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-712 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 617-886 | VERIZON NEW ENGLAND INC. | No |
| 617-952 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
FAQ
What area code is Charlestown, MA?
Charlestown is served by 2 area codes — 617, 857 — which overlay the same territory.
How many prefixes does Charlestown have?
23 active NXX prefixes are anchored to this rate center in NANPA records, held by 9 carriers.
Is a call from a Charlestown prefix really from Charlestown?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.