COLUMBIA prefixes in area code 410
NANPA records 20 assigned NXX blocks to rate center COLUMBIA in area code 410, 2.6% of the 783 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 6 holders hold those blocks, the largest being VERIZON MARYLAND, INC. (15), TELEPORT COMMUNICATIONS AMERICA, LLC - MD (1), SPOK, INC. (1). 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 207, 223, 235, 252 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 410-290 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-309 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-312 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-381 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-423 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MD | – | no | yes |
| 410-447 | Spok SPOK, INC. | – | no | yes |
| 410-531 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-707 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | no | yes |
| 410-715 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-730 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-740 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-772 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 410-794 | Lumen LEVEL 3 TELECOM OF MARYLAND, LLC - MD | – | yes | yes |
| 410-872 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-884 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-910 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | – | no | yes |
| 410-953 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 410-964 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 410-992 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 410-997 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| VERIZON MARYLAND, INC. | Verizon | 15 | 75% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | AT&T | 1 | 5% |
| SPOK, INC. | Spok | 1 | 5% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Verizon | 1 | 5% |
| LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Lumen | 1 | 5% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | Verizon | 1 | 5% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to COLUMBIA in area code 410?
20 blocks: 290, 309, 312, 381, 423, 447, 531, 707, 715, 730, 740, 772 and 8 more, all listed in the table above.
Which carriers have numbers in COLUMBIA?
VERIZON MARYLAND, INC. (15 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MD (1 block), SPOK, INC. (1 block), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (1 block), LEVEL 3 TELECOM OF MARYLAND, LLC - MD (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is COLUMBIA a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.