Columbia, MD — rate center
- State
- Maryland
- Active prefixes
- 62
- Carriers
- 19
- Pooled prefixes
- 43
- LATA
- 238
- Metro area
- Baltimore-Columbia-Towson, MD MSA
In NANP numbering, Columbia, Maryland is a rate center — the anchor point for local numbers. It is reached through 410, 443, 667 (multiple area codes serve it).
NANPA records show 62 active prefixes here, held by 19 different carriers. Pooling applies to 43 of them — individual thousands-blocks may belong to different companies.
The rate center belongs to the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area. Routing-wise it sits in LATA 238.
Because 410, 443, 667 all serve this territory, two Columbia 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 Columbia 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 Columbia
| Prefix | Code holder | Pooled |
|---|---|---|
| 410-290 | VERIZON MARYLAND, INC. | No |
| 410-309 | VERIZON MARYLAND, INC. | No |
| 410-312 | VERIZON MARYLAND, INC. | No |
| 410-381 | VERIZON MARYLAND, INC. | No |
| 410-423 | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | No |
| 410-447 | SPOK, INC. | No |
| 410-531 | VERIZON MARYLAND, INC. | No |
| 410-707 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | No |
| 410-715 | VERIZON MARYLAND, INC. | No |
| 410-730 | VERIZON MARYLAND, INC. | No |
| 410-740 | VERIZON MARYLAND, INC. | No |
| 410-772 | VERIZON MARYLAND, INC. | Yes |
| 410-794 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Yes |
| 410-872 | VERIZON MARYLAND, INC. | No |
| 410-884 | VERIZON MARYLAND, INC. | No |
| 410-910 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | No |
| 410-953 | VERIZON MARYLAND, INC. | Yes |
| 410-964 | VERIZON MARYLAND, INC. | No |
| 410-992 | VERIZON MARYLAND, INC. | Yes |
| 410-997 | VERIZON MARYLAND, INC. | No |
FAQ
What area code is Columbia, MD?
Columbia is served by 3 area codes — 410, 443, 667 — which overlay the same territory.
How many prefixes does Columbia have?
62 active NXX prefixes are anchored to this rate center in NANPA records, held by 19 carriers.
Is a call from a Columbia prefix really from Columbia?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.