Cambridge, MD — rate center
Cambridge is a telephone rate center in Maryland served by area codes 410, 443, 667. A rate center is the locality the phone industry uses to anchor numbers for billing; every prefix listed below is registered here.
The rate center currently carries 16 working prefixes, held by 9 different carriers. Pooling applies to 13 of them — individual thousands-blocks may belong to different companies.
Routing-wise it sits in LATA 242.
Because 410, 443, 667 all serve this territory, two Cambridge numbers can look completely different while being neighbors — check the prefix, not just the area code.
A Cambridge 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 Cambridge
| Prefix | Code holder | Pooled |
|---|---|---|
| 410-221 | VERIZON MARYLAND, INC. | No |
| 410-228 | VERIZON MARYLAND, INC. | No |
| 410-330 | NEW CINGULAR WIRELESS PCS, LLC - DC | Yes |
| 410-901 | VERIZON MARYLAND, INC. | Yes |
FAQ
What area code is Cambridge, MD?
Cambridge is served by 3 area codes — 410, 443, 667 — which overlay the same territory.
How many prefixes does Cambridge have?
16 active NXX prefixes are anchored to this rate center in NANPA records, held by 9 carriers.
Is a call from a Cambridge prefix really from Cambridge?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.