All assignees
800 prefixes in 410 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 410-400 | BALTIMORE | 829J | 2006-06-15 | Yes |
| 410-401 | BRYNPKLNCM | 7228 | — | Yes |
| 410-402 | CATONSVL | 7228 | — | Yes |
| 410-403 | COCKEYSVL | 7228 | — | Yes |
| 410-404 | BALTIMORE | 6395 | — | — |
| 410-405 | FORK | 9212 | — | Yes |
| 410-406 | ESSEX | 7228 | — | Yes |
| 410-407 | ELKRIDGE | 9212 | — | — |
| 410-408 | TOWSON | 6630 | — | — |
| 410-409 | BALTIMORE | 6395 | — | — |
| 410-410 | BALTIMORE | 624H | 2023-05-17 | Yes |
| 410-411 | XXXXXXXXXX | MULT | — | — |
| 410-412 | GLENBURNIE | 7228 | — | Yes |
| 410-413 | PIKESVILLE | 7228 | — | Yes |
| 410-414 | PRINCEFRCK | 9212 | — | Yes |
| 410-415 | PIKESVILLE | 9212 | — | Yes |
| 410-416 | WATERLO236 | 9748 | — | — |
| 410-417 | EDGEWOOD | 9212 | 2007-08-16 | Yes |
| 410-418 | ELLICOTTCY | 9212 | — | — |
| 410-419 | BALTIMORE | 6855 | — | Yes |
| 410-420 | BEL AIR | 9212 | — | Yes |
| 410-421 | SEVERNA PK | 9212 | — | Yes |
| 410-422 | SALISBURY | 4036 | — | — |
| 410-423 | COLUMBIA | 7325 | — | — |
| 410-424 | GLENBURNIE | 9212 | — | Yes |
| 410-425 | SMITH IS | 9212 | — | Yes |
| 410-426 | BALTIMORE | 9212 | — | — |
| 410-427 | TOWSON | 7325 | — | — |
| 410-428 | CATONSVL | 4036 | — | — |
| 410-429 | WORTHINGTN | 9212 | — | Yes |
| 410-430 | SALISBURY | 6395 | — | — |
| 410-431 | SEVERNA PK | 9212 | — | Yes |
| 410-432 | SEVERNA PK | 9212 | — | Yes |
| 410-433 | BALTIMORE | 9212 | — | — |
| 410-434 | TOWSON | 6630 | — | — |
| 410-435 | BALTIMORE | 9212 | — | — |
| 410-436 | EDGEWOOD | 9212 | — | Yes |
| 410-437 | ARGRGBSNIS | 9212 | — | — |
| 410-438 | SUDLERSVL | 9212 | — | Yes |
| 410-439 | ARGRGBSNIS | 9212 | — | — |
| 410-440 | CATONSVL | 4036 | — | — |
| 410-441 | ELKTON | 4036 | — | Yes |
| 410-442 | ELLICOTTCY | 9212 | — | Yes |
| 410-443 | EASTON | 6119 | 2002-07-23 | Yes |
| 410-444 | BALTIMORE | 9212 | — | — |
| 410-445 | BALTIMORE | 6630 | — | — |
| 410-446 | CATONSVL | 4036 | — | — |
| 410-447 | COLUMBIA | 6630 | — | — |
| 410-448 | BALTIMORE | 9212 | — | Yes |
| 410-449 | SOLOMONS | 071F | 2010-02-12 | Yes |
| 410-450 | BALTIMORE | 9212 | — | Yes |
| 410-451 | CROFTON | 9212 | — | — |
| 410-452 | CARDIFF | 9212 | — | Yes |
| 410-453 | TOWSON | 9212 | — | Yes |
| 410-454 | BALTIMORE | 7228 | — | — |
| 410-455 | CATONSVL | 9212 | — | — |
| 410-456 | BALTIMORE | 6395 | — | — |
| 410-457 | DARLINGTON | 9212 | — | Yes |
| 410-458 | BALTIMORE | 6395 | — | — |
| 410-459 | FALLSTON | 6395 | — | — |
| 410-460 | ELKRIDGE | 6630 | — | — |
| 410-461 | ELLICOTTCY | 9212 | — | — |
| 410-462 | BALTIMORE | 9212 | — | — |
| 410-463 | TRAPPE | 6395 | — | Yes |
| 410-464 | BALTIMORE | 9212 | — | Yes |
| 410-465 | ELLICOTTCY | 9212 | — | — |
| 410-466 | BALTIMORE | 9212 | — | — |
| 410-467 | BALTIMORE | 9212 | — | — |
| 410-468 | BALTIMORE | 9212 | — | — |
| 410-469 | BALTIMORE | 9212 | — | Yes |
| 410-470 | BALTIMORE | 9212 | 2005-06-28 | Yes |
| 410-471 | ELKRIDGE | 9212 | — | — |
| 410-472 | SPARKSGLNC | 9212 | — | Yes |
| 410-473 | TOWSON | 6630 | — | — |
| 410-474 | PRINCEFRCK | 6395 | — | — |
| 410-475 | TOWSON | 6630 | — | — |
| 410-476 | TRAPPE | 9212 | — | Yes |
| 410-477 | SPARROWSPT | 9212 | — | — |
| 410-478 | BALTIMORE | 4036 | 2023-07-19 | Yes |
| 410-479 | DENTON | 9212 | — | Yes |
| 410-480 | ELLICOTTCY | 9212 | — | — |
| 410-481 | BALTIMORE | 9212 | — | — |
| 410-482 | GREENSBORO | 9212 | — | Yes |
| 410-483 | BALTIMORE | 9212 | — | Yes |
| 410-484 | PIKESVILLE | 9212 | — | — |
| 410-485 | BALTIMORE | 9212 | — | — |
| 410-486 | PIKESVILLE | 9212 | — | — |
| 410-487 | GLENBURNIE | 7228 | — | Yes |
| 410-488 | BALTIMORE | 9212 | — | — |
| 410-489 | GLENWOOD | 9212 | — | Yes |
| 410-490 | CENTREVL | 6395 | — | — |
| 410-491 | CATONSVL | 4036 | — | Yes |
| 410-492 | TOWSON | 6630 | — | — |
| 410-493 | BALTIMORE | 6855 | — | Yes |
| 410-494 | TOWSON | 9212 | — | — |
| 410-495 | PRINCEFRCK | 9212 | — | — |
| 410-496 | RANDALLSTN | 9212 | — | — |
| 410-497 | PARKVILLE | 318J | — | Yes |
| 410-498 | COCKEYSVL | 829J | — | Yes |
| 410-499 | BALTIMORE | 6855 | — | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.