All assignees
466 prefixes in 667 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 667-300 | COLUMBIA | 2593 | 2018-06-01 | Yes |
| 667-301 | PRINCEFRCK | 6395 | 2021-01-25 | Yes |
| 667-302 | CECILTON | 073H | 2021-02-09 | Yes |
| 667-303 | BALTIMORE | 551G | 2013-03-11 | Yes |
| 667-304 | ESSEX | 071F | 2021-02-22 | Yes |
| 667-305 | PIKESVILLE | 551G | 2013-05-10 | Yes |
| 667-306 | BALTIMORE | 6119 | 2021-03-19 | Yes |
| 667-307 | CROFTON | 568G | 2013-04-09 | Yes |
| 667-308 | TOWSON | 568G | 2012-11-20 | Yes |
| 667-309 | BALTIMORE | 876D | — | Yes |
| 667-310 | PARKVILLE | 6855 | 2021-04-13 | Yes |
| 667-311 | XXXXXXXXXX | MULT | — | — |
| 667-312 | BALTIMORE | 361H | 2015-05-11 | Yes |
| 667-313 | PIKESVILLE | 7228 | 2015-12-16 | Yes |
| 667-314 | WESTMINSTR | 964H | — | Yes |
| 667-315 | BEL AIR | 071F | 2021-04-13 | Yes |
| 667-316 | OXFORD | 073H | 2021-04-17 | Yes |
| 667-317 | PRINCEANNE | 6119 | 2021-04-21 | Yes |
| 667-318 | COCKEYSVL | 071F | 2021-05-04 | Yes |
| 667-319 | CHESTERTN | 6855 | 2021-05-05 | Yes |
| 667-320 | ABERDEEN | 6855 | 2021-05-05 | Yes |
| 667-321 | PRINCEFRCK | 6855 | 2016-06-21 | Yes |
| 667-322 | WATERLO236 | 876D | 2021-05-12 | Yes |
| 667-323 | QUEENSTOWN | 6119 | 2021-05-25 | Yes |
| 667-324 | RANDALLSTN | 6855 | 2021-06-03 | Yes |
| 667-325 | GLENBURNIE | 6855 | 2021-06-11 | Yes |
| 667-326 | CHURCHHILL | 2593 | 2018-12-10 | Yes |
| 667-327 | CAMBRIDGE | 876D | 2021-03-18 | Yes |
| 667-328 | ESSEX | 4036 | 2021-06-23 | Yes |
| 667-329 | PARKTON | 073H | 2021-06-23 | Yes |
| 667-330 | SALISBURY | 829J | 2012-05-23 | Yes |
| 667-331 | TOWSON | 4036 | 2021-07-08 | Yes |
| 667-332 | NEWWINDSOR | 2593 | 2018-10-15 | Yes |
| 667-333 | ARGRGBSNIS | 8697 | 2015-05-14 | Yes |
| 667-334 | ABERDEEN | 6855 | 2021-08-26 | Yes |
| 667-335 | BALTIMORE | 6855 | 2021-08-26 | Yes |
| 667-336 | BEL AIR | 2593 | 2018-06-01 | Yes |
| 667-337 | CENTREVL | 876D | 2021-03-18 | Yes |
| 667-338 | CROFTON | 876D | 2021-09-01 | Yes |
| 667-339 | SYKESVILLE | 876D | 2021-09-01 | Yes |
| 667-340 | CHURCHVL | 876D | 2021-09-01 | Yes |
| 667-341 | DELMAR | 876D | 2021-09-01 | Yes |
| 667-342 | PRESTON | 876D | 2021-09-01 | Yes |
| 667-343 | CAMBRIDGE | 7228 | 2021-07-28 | Yes |
| 667-344 | CHASE | 073H | — | Yes |
| 667-345 | CATONSVL | 2593 | 2018-06-04 | Yes |
| 667-346 | SALISBURY | 425J | 2019-10-15 | Yes |
| 667-347 | FEDERALSBG | 876D | 2021-03-18 | Yes |
| 667-348 | RIDGELY | 876D | 2021-09-01 | Yes |
| 667-349 | STILL POND | 876D | 2021-09-01 | Yes |
| 667-350 | WINGATE | 876D | 2021-09-01 | Yes |
| 667-351 | BALTIMORE | 6855 | 2021-09-27 | Yes |
| 667-352 | ABERDEEN | 6855 | 2016-11-14 | Yes |
| 667-353 | CARDIFF | 469J | 2019-09-12 | Yes |
| 667-354 | BALTIMORE | 6855 | 2021-10-07 | Yes |
| 667-355 | ABERDEEN | 6855 | 2021-10-07 | Yes |
| 667-356 | SEVERN | 876D | 2021-03-25 | Yes |
| 667-357 | GREENSBORO | 876D | 2021-03-18 | Yes |
| 667-358 | EASTON | 6855 | 2021-11-01 | Yes |
| 667-359 | COLUMBIA | 071F | 2021-10-25 | Yes |
| 667-360 | ODENTON | 876D | 2021-03-25 | Yes |
| 667-361 | CHURCHHILL | 624H | 2021-06-17 | Yes |
| 667-362 | ANNAPOLIS | 2593 | 2018-10-18 | Yes |
| 667-363 | SHERWD FOR | 876D | 2021-03-25 | Yes |
| 667-364 | STEVENSVL | 2593 | 2018-06-04 | Yes |
| 667-365 | CHESAPKECY | 516J | 2021-05-07 | Yes |
| 667-366 | HAMPSTEAD | 2593 | 2018-10-15 | Yes |
| 667-367 | WESTMINSTR | 8697 | 2015-05-21 | Yes |
| 667-368 | ELKTON | 6626 | 2021-11-17 | Yes |
| 667-369 | CATONSVL | 6855 | 2021-11-17 | Yes |
| 667-370 | PARKTON | 876D | 2021-03-25 | Yes |
| 667-371 | ELLICOTTCY | 6855 | 2021-11-22 | Yes |
| 667-372 | CAMBRIDGE | 2593 | 2018-10-15 | Yes |
| 667-373 | NORTHBEACH | 2593 | 2018-10-15 | Yes |
| 667-374 | WATERLO238 | 071F | 2021-12-03 | Yes |
| 667-375 | CHASE | 6855 | 2021-12-07 | Yes |
| 667-376 | OXFORD | 876D | 2021-03-18 | Yes |
| 667-377 | ROCK HALL | 876D | 2021-03-18 | Yes |
| 667-378 | ESSEX | 6855 | 2021-12-07 | Yes |
| 667-379 | BALTIMORE | 6855 | 2021-12-07 | Yes |
| 667-380 | ANNAPOLIS | 876D | 2021-09-01 | Yes |
| 667-381 | PARKVILLE | 6855 | 2021-12-07 | Yes |
| 667-382 | WINGATE | 2593 | 2018-10-16 | Yes |
| 667-383 | TOWSON | 6855 | 2021-12-07 | Yes |
| 667-384 | SALISBURY | 490J | 2021-12-10 | Yes |
| 667-385 | SOLOMONS | 490J | 2021-12-10 | Yes |
| 667-386 | ARBUTUS | 5562 | 2021-12-14 | Yes |
| 667-387 | PERRYVILLE | 876D | 2021-03-25 | Yes |
| 667-388 | SEVERN | 4036 | 2021-12-15 | Yes |
| 667-389 | CAMBRIDGE | 939H | — | Yes |
| 667-390 | RANDALLSTN | 6855 | 2022-01-27 | Yes |
| 667-391 | BALTIMORE | 6855 | 2022-01-27 | Yes |
| 667-392 | ABERDEEN | 6855 | 2022-01-27 | Yes |
| 667-393 | MILLERSVL | 071F | 2022-02-10 | Yes |
| 667-394 | NEWWINDSOR | 071F | 2022-02-22 | Yes |
| 667-395 | CARDIFF | 071F | 2022-02-22 | Yes |
| 667-396 | PT DEPOSIT | 876D | 2021-03-25 | Yes |
| 667-397 | SOLOMONS | 876D | 2021-03-25 | Yes |
| 667-398 | PT DEPOSIT | 071F | 2022-02-22 | Yes |
| 667-399 | UNION BDG | 321J | 2020-04-10 | 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.