Waltham, MA — rate center
- State
- Massachusetts
- Active prefixes
- 83
- Carriers
- 15
- Pooled prefixes
- 50
- LATA
- 128
- Metro area
- Boston-Cambridge-Newton, MA-NH MSA
The Waltham rate center (Massachusetts) anchors 83 active prefixes under area codes 339, 617, 781. Rate centers, not city limits, are what phone numbers are legally tied to.
The rate center currently carries 83 working prefixes across 15 carriers. 50 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 (339/617/781) is the overlay pattern: same geography, different first three digits.
A Waltham prefix on caller ID is a starting point, not proof of origin — numbers travel with their owners and displays can be spoofed. Use official callback numbers for anything sensitive.
Prefixes anchored to Waltham
| Prefix | Code holder | Pooled |
|---|---|---|
| 617-281 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-538 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-633 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-930 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-962 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-966 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
| 617-967 | NEW CINGULAR WIRELESS PCS, LLC - DC | Yes |
| 617-968 | NEW CINGULAR WIRELESS PCS, LLC - DC | Yes |
| 617-974 | NEW CINGULAR WIRELESS PCS, LLC - DC | No |
FAQ
What area code is Waltham, MA?
Waltham is served by 3 area codes — 339, 617, 781 — which overlay the same territory.
How many prefixes does Waltham have?
83 active NXX prefixes are anchored to this rate center in NANPA records, held by 15 carriers.
Is a call from a Waltham prefix really from Waltham?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.