Severn, MD — rate center
- State
- Maryland
- Active prefixes
- 23
- Carriers
- 10
- Pooled prefixes
- 18
- LATA
- 238
- Metro area
- Baltimore-Columbia-Towson, MD MSA
The Severn rate center (Maryland) anchors 23 active prefixes under area codes 410, 443, 667. Rate centers, not city limits, are what phone numbers are legally tied to.
23 central-office prefixes are currently anchored to this rate center across 10 carriers. 18 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
The rate center belongs to the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area. Routing-wise it sits in LATA 238.
Multiple area codes over one rate center (410/443/667) is the overlay pattern: same geography, different first three digits.
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 Severn
| Prefix | Code holder | Pooled |
|---|---|---|
| 410-222 | VERIZON MARYLAND, INC. | No |
| 410-514 | VERIZON MARYLAND, INC. | Yes |
| 410-519 | VERIZON MARYLAND, INC. | No |
| 410-551 | VERIZON MARYLAND, INC. | No |
| 410-729 | VERIZON MARYLAND, INC. | Yes |
| 410-846 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | Yes |
| 410-921 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Yes |
| 410-969 | VERIZON MARYLAND, INC. | No |
| 410-987 | VERIZON MARYLAND, INC. | No |
FAQ
What area code is Severn, MD?
Severn is served by 3 area codes — 410, 443, 667 — which overlay the same territory.
How many prefixes does Severn have?
23 active NXX prefixes are anchored to this rate center in NANPA records, held by 10 carriers.
Is a call from a Severn prefix really from Severn?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.