All assignees
466 prefixes in 667 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 667-500 | ANNAPOLIS | 2593 | 2018-06-01 | Yes |
| 667-501 | DUNDALK | 4036 | 2024-12-19 | Yes |
| 667-502 | COLUMBIA | 4036 | 2024-12-27 | Yes |
| 667-503 | BALTIMORE | 624H | 2025-01-29 | Yes |
| 667-504 | BALTIMORE | 4036 | 2025-02-10 | Yes |
| 667-505 | PIKESVILLE | 4036 | 2025-02-20 | Yes |
| 667-506 | BALTIMORE | 4036 | 2025-03-07 | Yes |
| 667-507 | SEVERN | 4036 | 2025-03-27 | Yes |
| 667-508 | WOODLAWN | 4036 | 2025-04-29 | Yes |
| 667-509 | SEVERNA PK | 6855 | 2025-05-14 | Yes |
| 667-510 | PIKESVILLE | 4036 | 2025-05-15 | Yes |
| 667-511 | XXXXXXXXXX | MULT | — | — |
| 667-512 | PIKESVILLE | 4036 | 2025-05-15 | Yes |
| 667-513 | BALTIMORE | 616J | 2025-05-20 | Yes |
| 667-514 | BALTIMORE | 4036 | 2025-05-20 | Yes |
| 667-515 | BALTIMORE | 4036 | 2025-06-06 | Yes |
| 667-516 | BALTIMORE | 4036 | 2025-06-17 | Yes |
| 667-517 | CATONSVL | 6855 | 2024-10-21 | Yes |
| 667-518 | BALTIMORE | 4036 | 2025-06-17 | Yes |
| 667-519 | BALTIMORE | 4036 | 2025-06-17 | Yes |
| 667-520 | ABERDEEN | 6855 | 2025-06-26 | Yes |
| 667-521 | PIKESVILLE | 4036 | 2025-07-10 | Yes |
| 667-522 | ABERDEEN | 6855 | 2025-07-29 | Yes |
| 667-523 | ODENTON | 7325 | 2025-08-05 | Yes |
| 667-524 | SALISBURY | 071F | 2025-08-12 | Yes |
| 667-525 | BALTIMORE | 876D | 2025-08-13 | Yes |
| 667-526 | CENTREVL | 516J | 2022-03-03 | Yes |
| 667-527 | GLENBURNIE | 490J | 2025-09-04 | Yes |
| 667-528 | ABERDEEN | 6855 | 2025-09-03 | Yes |
| 667-529 | HURLOCK | 965H | 2021-06-03 | Yes |
| 667-530 | ABERDEEN | 6855 | 2025-09-18 | Yes |
| 667-531 | ABERDEEN | 6855 | 2025-10-31 | Yes |
| 667-532 | PARKVILLE | 876D | 2025-11-04 | Yes |
| 667-533 | PIKESVILLE | 700J | 2025-11-26 | Yes |
| 667-534 | SALISBURY | 700J | 2025-11-26 | Yes |
| 667-535 | RISING SUN | 490J | 2025-12-09 | Yes |
| 667-536 | STILL POND | 490J | 2026-01-06 | Yes |
| 667-537 | ESSEX | 4036 | 2026-01-15 | Yes |
| 667-538 | CHURCHVL | 876D | 2026-01-27 | Yes |
| 667-539 | BALTIMORE | 4036 | 2026-02-20 | Yes |
| 667-540 | PIKESVILLE | 4036 | 2026-03-03 | Yes |
| 667-541 | GLENBURNIE | 4036 | 2026-03-18 | Yes |
| 667-542 | ABERDEEN | 6855 | — | Yes |
| 667-543 | PIKESVILLE | 4036 | 2026-03-18 | Yes |
| 667-544 | PIKESVILLE | 4036 | 2026-03-18 | Yes |
| 667-545 | WARWICK | 2593 | 2018-10-16 | Yes |
| 667-546 | PRINCEFRCK | 6395 | 2026-03-27 | Yes |
| 667-547 | BALTIMORE | 671J | 2026-05-07 | Yes |
| 667-548 | TOWSON | 876D | 2026-06-01 | Yes |
| 667-549 | ANNAPOLIS | 4036 | 2026-01-05 | Yes |
| 667-550 | COLUMBIA | 4036 | 2026-06-24 | Yes |
| 667-551 | ANNAPOLIS | 876D | 2026-07-02 | Yes |
| 667-552 | SEVERNA PK | 4036 | 2026-07-08 | Yes |
| 667-553 | SUDLERSVL | 671J | 2026-07-27 | Yes |
| 667-554 | COLUMBIA | 4036 | 2026-09-09 | Yes |
| 667-555 | DIR ASST | MULT | — | — |
| 667-556 | BEL AIR | 876D | 2026-09-09 | Yes |
| 667-557 | CATONSVL | 4036 | 2026-09-16 | Yes |
| 667-560 | BALTIMORE | 5562 | 2026-08-05 | Yes |
| 667-566 | STEVENSVL | 939H | 2022-09-15 | Yes |
| 667-567 | HAVREGRACE | 876D | 2021-03-25 | Yes |
| 667-570 | BALTIMORE | 5562 | 2026-08-25 | Yes |
| 667-576 | JARRETTSVL | 876D | 2021-03-25 | Yes |
| 667-577 | ELKTON | 965H | 2020-07-15 | Yes |
| 667-596 | PIKESVILLE | 4036 | 2024-11-06 | Yes |
| 667-600 | BALTIMORE | 139F | 2015-09-22 | Yes |
| 667-611 | XXXXXXXXXX | MULT | — | — |
| 667-622 | PIKESVILLE | 516J | 2022-03-23 | Yes |
| 667-626 | CATONSVL | 516J | 2022-03-01 | Yes |
| 667-627 | ANNAPOLIS | 2593 | 2018-10-18 | Yes |
| 667-644 | SEVERNA PK | 624H | 2021-04-26 | Yes |
| 667-646 | ANNAPOLIS | 516J | 2021-02-11 | Yes |
| 667-647 | NORTH EAST | 624H | 2021-04-26 | Yes |
| 667-653 | BRYNPKLNCM | 2593 | 2018-12-11 | Yes |
| 667-656 | EDGEWOOD | 624H | 2021-05-27 | Yes |
| 667-657 | CHASE | 876D | 2021-03-25 | Yes |
| 667-660 | MARION | 876D | 2019-10-10 | Yes |
| 667-661 | SNOW HILL | 876D | 2019-10-10 | Yes |
| 667-662 | SMITH IS | 876D | 2019-10-10 | Yes |
| 667-663 | OCEAN CITY | 876D | 2019-10-10 | Yes |
| 667-664 | TRAPPE | 876D | 2019-10-10 | Yes |
| 667-665 | HILLSBORO | 624H | 2021-06-17 | Yes |
| 667-666 | WEST RIVER | 876D | — | Yes |
| 667-667 | PIKESVILLE | 876D | 2025-08-20 | Yes |
| 667-668 | FALLSTON | 624H | 2021-04-26 | Yes |
| 667-669 | GALENA | 624H | 2021-06-17 | Yes |
| 667-670 | SUDLERSVL | 876D | 2021-03-18 | Yes |
| 667-676 | WILLARDS | 876D | 2020-09-21 | Yes |
| 667-677 | BALTIMORE | 876D | 2015-05-08 | Yes |
| 667-678 | COLUMBIA | 876D | 2021-08-31 | Yes |
| 667-686 | ELLICOTTCY | 2593 | 2018-10-15 | Yes |
| 667-687 | WARWICK | 876D | 2021-03-18 | Yes |
| 667-688 | PARKVILLE | 965H | 2020-07-15 | Yes |
| 667-693 | VIENNA | 516J | 2022-03-23 | Yes |
| 667-700 | — | — | ||
| 667-701 | ELKRIDGE | 4036 | 2015-10-19 | Yes |
| 667-706 | ELKTON | 6626 | 2016-05-23 | Yes |
| 667-711 | XXXXXXXXXX | MULT | — | — |
| 667-722 | GLENWOOD | 2593 | 2018-10-15 | Yes |
| 667-727 | SUDLERSVL | 2593 | 2018-10-16 | 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.