All assignees
466 prefixes in 667 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 667-400 | BALTIMORE | 964H | 2016-11-10 | Yes |
| 667-401 | BALTIMORE | 6119 | 2012-11-20 | Yes |
| 667-402 | BALTIMORE | 073H | 2016-12-02 | Yes |
| 667-403 | TOWSON | 876D | 2021-09-01 | Yes |
| 667-404 | PRINCEFRCK | 6855 | 2022-02-25 | Yes |
| 667-405 | GLENBURNIE | 6855 | 2022-03-22 | Yes |
| 667-406 | BALTIMORE | 6855 | 2022-05-18 | Yes |
| 667-407 | BALTIMORE | 876D | 2022-05-19 | Yes |
| 667-408 | ANNAPOLIS | 6395 | 2022-05-20 | Yes |
| 667-409 | PARKVILLE | 071F | 2022-08-03 | Yes |
| 667-410 | SEVERN | 4036 | 2022-08-16 | Yes |
| 667-411 | XXXXXXXXXX | MULT | — | — |
| 667-412 | EASTON | 732J | 2022-08-16 | Yes |
| 667-413 | ARGRGBSNIS | 732J | 2022-08-16 | Yes |
| 667-414 | BALTIMORE | 071F | 2022-09-28 | Yes |
| 667-415 | ABERDEEN | 6855 | 2022-10-11 | Yes |
| 667-416 | ESSEX | 071F | 2022-10-18 | Yes |
| 667-417 | GLENBURNIE | 071F | 2022-10-25 | Yes |
| 667-418 | GREENSBORO | 318J | 2022-10-27 | Yes |
| 667-419 | CATONSVL | 4036 | 2022-11-08 | Yes |
| 667-420 | FEDERALSBG | 490J | 2022-11-23 | Yes |
| 667-421 | COLUMBIA | 073H | — | Yes |
| 667-422 | BALTIMORE | 508J | 2022-12-16 | Yes |
| 667-423 | ANNAPOLIS | 6855 | 2023-01-06 | Yes |
| 667-424 | ODENTON | 7229 | 2023-02-08 | Yes |
| 667-425 | BALTIMORE | 732J | 2023-02-10 | Yes |
| 667-426 | TANEYTOWN | 876D | 2021-03-25 | Yes |
| 667-427 | WEST RIVER | 876D | 2021-03-25 | Yes |
| 667-428 | SALISBURY | 732J | 2023-02-10 | Yes |
| 667-429 | PIKESVILLE | 4036 | 2023-02-13 | Yes |
| 667-430 | PIKESVILLE | 4036 | 2023-04-05 | Yes |
| 667-431 | ARBUTUS | 5562 | 2023-04-13 | Yes |
| 667-432 | CATONSVL | 4036 | 2023-04-20 | Yes |
| 667-433 | CATONSVL | 4036 | 2023-05-03 | Yes |
| 667-434 | BALTIMORE | 6855 | 2023-05-05 | Yes |
| 667-435 | BALTIMORE | 876D | 2023-05-17 | Yes |
| 667-436 | TOWSON | 6855 | 2023-05-19 | Yes |
| 667-437 | BALTIMORE | 6855 | 2023-06-28 | Yes |
| 667-438 | CATONSVL | 4036 | 2023-07-19 | Yes |
| 667-439 | PIKESVILLE | 6855 | 2023-07-20 | Yes |
| 667-440 | BALTIMORE | 876D | 2023-07-25 | Yes |
| 667-441 | PARKVILLE | 4036 | 2023-07-26 | Yes |
| 667-442 | ESSEX | 4036 | 2023-08-02 | Yes |
| 667-443 | CHASE | 6855 | 2023-10-19 | Yes |
| 667-444 | BALTIMORE | 876D | 2015-08-17 | Yes |
| 667-445 | CATONSVL | 6855 | 2023-08-09 | Yes |
| 667-446 | ELKRIDGE | 516J | 2022-03-01 | Yes |
| 667-447 | COLUMBIA | 6855 | 2023-08-23 | Yes |
| 667-448 | REISTERSTN | 4036 | 2023-08-25 | Yes |
| 667-449 | PRESTON | 939H | 2023-08-31 | Yes |
| 667-450 | ABERDEEN | 6855 | 2023-08-31 | Yes |
| 667-451 | FORK | 4036 | 2023-09-11 | Yes |
| 667-452 | CATONSVL | 4036 | 2023-09-14 | Yes |
| 667-453 | PRINCEFRCK | 6855 | 2023-09-20 | Yes |
| 667-454 | BEL AIR | 197D | 2023-10-17 | Yes |
| 667-455 | EDGEWOOD | 197D | 2023-10-24 | Yes |
| 667-456 | DUNDALK | 4036 | 2023-11-06 | Yes |
| 667-457 | CHURCHHILL | 939H | 2023-11-21 | Yes |
| 667-458 | ANNAPOLIS | 6395 | 2016-05-10 | Yes |
| 667-459 | OXFORD | 939H | 2023-11-21 | Yes |
| 667-460 | PIKESVILLE | 4036 | 2023-11-28 | Yes |
| 667-461 | BALTIMORE | 598J | 2023-12-01 | Yes |
| 667-462 | ELKTON | 490J | 2023-12-01 | Yes |
| 667-463 | DARLINGTON | 598J | 2023-12-27 | Yes |
| 667-464 | BALTIMORE | 516J | 2022-01-28 | Yes |
| 667-465 | ABERDEEN | 6855 | 2024-01-11 | Yes |
| 667-466 | HAVREGRACE | 516J | 2022-02-24 | Yes |
| 667-467 | DENTON | 624H | 2021-06-17 | Yes |
| 667-468 | NANTICOKE | 516J | 2022-03-01 | Yes |
| 667-469 | BEL AIR | 876D | 2024-02-02 | Yes |
| 667-470 | GLENBURNIE | 4036 | 2024-03-08 | Yes |
| 667-471 | PIKESVILLE | 4036 | 2024-03-14 | Yes |
| 667-472 | PRINCEANNE | 876D | 2024-03-18 | Yes |
| 667-473 | SOLOMONS | 2593 | 2018-10-16 | Yes |
| 667-474 | ARGRGBSNIS | 876D | 2024-03-20 | Yes |
| 667-475 | CROFTON | 876D | 2024-03-21 | Yes |
| 667-476 | GLENWOOD | 876D | 2021-03-25 | Yes |
| 667-477 | HAMPSTEAD | 876D | 2021-03-25 | Yes |
| 667-478 | SYKESVILLE | 876D | 2024-03-21 | Yes |
| 667-479 | ELLICOTTCY | 876D | 2024-03-21 | Yes |
| 667-480 | WATERLO236 | 876D | 2024-03-26 | Yes |
| 667-481 | ABERDEEN | 6855 | 2024-03-29 | Yes |
| 667-482 | CATONSVL | 4036 | 2024-05-01 | Yes |
| 667-483 | DEALISLAND | 516J | 2022-03-04 | Yes |
| 667-484 | WESTMINSTR | 490J | 2024-05-08 | Yes |
| 667-485 | CAMBRIDGE | 6395 | 2024-05-17 | Yes |
| 667-486 | PRINCEFRCK | 6855 | 2024-05-17 | Yes |
| 667-487 | BALTIMORE | 475J | 2024-05-20 | Yes |
| 667-488 | SALISBURY | 475J | 2024-05-20 | Yes |
| 667-489 | HAMPSTEAD | 876D | 2024-06-13 | Yes |
| 667-490 | PIKESVILLE | 4036 | 2024-06-27 | Yes |
| 667-491 | PIKESVILLE | 4036 | 2024-09-03 | Yes |
| 667-492 | SEVERN | 7229 | 2024-05-31 | Yes |
| 667-493 | ANNAPOLIS | 6855 | 2024-09-24 | Yes |
| 667-494 | ABERDEEN | 6855 | 2024-10-29 | Yes |
| 667-495 | BALTIMORE | 616J | 2024-11-01 | Yes |
| 667-496 | SALISBURY | 616J | 2024-11-06 | Yes |
| 667-497 | OCEAN CITY | 7421 | 2024-10-22 | Yes |
| 667-498 | ARBUTUS | 7421 | 2024-11-21 | Yes |
| 667-499 | PIKESVILLE | 4036 | 2024-12-02 | 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.