All assignees
800 prefixes in 240 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 240-400 | WSHNGTNZN2 | 6855 | 2011-08-18 | Yes |
| 240-401 | WSNGTNZN10 | 4036 | — | — |
| 240-402 | WSNG236Z13 | 7229 | 2010-09-21 | Yes |
| 240-403 | WSNGTNZN10 | 829J | — | Yes |
| 240-404 | GAITHERSBG | 7229 | 2001-02-13 | Yes |
| 240-405 | FREDERICK | 829J | 2004-07-27 | Yes |
| 240-406 | WSNGTNZN10 | 4036 | 2009-09-17 | Yes |
| 240-407 | WSNGTNZN16 | 6119 | — | Yes |
| 240-408 | WSNGTNZN10 | 4036 | 2009-10-14 | Yes |
| 240-409 | FREDERICK | 4036 | — | — |
| 240-410 | CUMBERLAND | 6855 | 2021-01-13 | Yes |
| 240-411 | XXXXXXXXXX | MULT | — | — |
| 240-412 | WALDORF | 5562 | 2001-01-16 | Yes |
| 240-413 | WSHNGTNZN4 | 6855 | 2001-03-12 | Yes |
| 240-414 | WSHNGTNZN6 | 568G | — | Yes |
| 240-415 | FREDERICK | 281E | 2008-12-16 | Yes |
| 240-416 | WALDORF | 4036 | 2001-05-18 | Yes |
| 240-417 | WSHNGTNZN5 | 5562 | — | Yes |
| 240-418 | WSHNGTNZN2 | 6855 | 2001-11-12 | Yes |
| 240-419 | WALDORF | 6395 | 2007-10-29 | Yes |
| 240-420 | HAGERSTOWN | 9212 | — | Yes |
| 240-421 | WSNGTNZN10 | 6855 | 2001-04-09 | Yes |
| 240-422 | FREDERICK | 6855 | 2002-05-15 | Yes |
| 240-423 | WSHNGTNZN3 | 6855 | 2001-05-21 | — |
| 240-424 | WSHNGTNZN3 | 6855 | 2007-11-16 | Yes |
| 240-425 | WSHNGTNZN2 | 6855 | — | Yes |
| 240-426 | WSHNGTNZN2 | 6855 | 2001-10-25 | Yes |
| 240-427 | WALDORF | 7229 | 2001-04-23 | Yes |
| 240-428 | WSNGTNZN10 | 071F | — | Yes |
| 240-429 | WSHNGTNZN3 | 6395 | 2006-12-19 | Yes |
| 240-430 | WSNGTNZN11 | 829J | — | Yes |
| 240-431 | LXTNPKGRML | 6855 | — | Yes |
| 240-432 | WSHNGTNZN3 | 6855 | — | Yes |
| 240-433 | WSNGTNZN12 | 829J | — | Yes |
| 240-434 | LEONARDTN | 6119 | — | Yes |
| 240-435 | WALDORF | 6395 | 2009-05-07 | Yes |
| 240-436 | BUCKEYSTN | 6119 | — | Yes |
| 240-437 | ASHTON236 | 7229 | — | Yes |
| 240-438 | WSHNGTNZN3 | 6855 | 2011-08-15 | Yes |
| 240-439 | FREDERICK | 6395 | 2008-06-06 | Yes |
| 240-440 | FREDERICK | 4036 | 2009-02-27 | Yes |
| 240-441 | WSHNGTNZN6 | 6855 | 2001-06-06 | — |
| 240-442 | OAKLAND | 9212 | 2001-05-22 | Yes |
| 240-443 | WSHNGTNZN6 | 876D | 2020-11-06 | Yes |
| 240-444 | LAUREL236 | 6395 | 2011-09-07 | Yes |
| 240-445 | WSHNGTNZN2 | 876D | — | Yes |
| 240-446 | FREDERICK | 6395 | 2001-08-09 | Yes |
| 240-447 | WSNGTNZN10 | 4036 | — | — |
| 240-448 | WALDORF | 876D | — | Yes |
| 240-449 | GAITHERSBG | 4036 | — | Yes |
| 240-450 | WSHNGTNZN3 | 829J | — | Yes |
| 240-451 | THURMONT | 876D | 2016-09-02 | Yes |
| 240-452 | HAGERSTOWN | 5562 | 2010-07-22 | Yes |
| 240-453 | WSNGTNZN10 | 9212 | — | Yes |
| 240-454 | GAITHERSBG | 829J | 2005-04-22 | Yes |
| 240-455 | WSHNGTNZN5 | 829J | 2001-06-20 | Yes |
| 240-456 | LAUREL236 | 9212 | — | Yes |
| 240-457 | FREDERICK | 6395 | 2008-09-04 | Yes |
| 240-458 | WALDORF | 6395 | 2011-10-04 | Yes |
| 240-459 | LAUREL236 | 6395 | 2010-07-27 | Yes |
| 240-460 | WSHNGTNZN3 | 4036 | — | — |
| 240-461 | WSHNGTNZN3 | 4036 | — | — |
| 240-462 | WSHNGTNZN3 | 6855 | — | Yes |
| 240-463 | WSHNGTNZN3 | 4036 | — | — |
| 240-464 | WSHNGTNZN2 | 6855 | — | Yes |
| 240-465 | WSHNGTNZN2 | 568G | — | Yes |
| 240-466 | MECHANCSVL | 4036 | 2001-07-10 | Yes |
| 240-467 | WSHNGTNZN4 | 318J | 2013-04-25 | Yes |
| 240-468 | WSHNGTNZN3 | 6855 | 2007-11-16 | Yes |
| 240-469 | HAGERSTOWN | 6855 | 2008-02-14 | Yes |
| 240-470 | LAUREL236 | 6395 | 2011-10-04 | Yes |
| 240-471 | WSNGTNZN12 | 876D | — | Yes |
| 240-472 | WSHNGTNZN3 | 4036 | — | — |
| 240-473 | WSNG236Z13 | 829J | — | Yes |
| 240-474 | GAITHERSBG | 8697 | 2015-05-22 | Yes |
| 240-475 | WSHNGTNZN3 | 4036 | — | — |
| 240-476 | WSHNGTNZN3 | 6855 | 2001-02-21 | — |
| 240-477 | GAITHERSBG | 829J | 2005-05-20 | Yes |
| 240-478 | WSHNGTNZN3 | 4036 | 2004-07-27 | Yes |
| 240-479 | WSHNGTNZN2 | 6395 | 2008-04-07 | Yes |
| 240-480 | WSHNGTNZN2 | 6855 | 2010-09-27 | Yes |
| 240-481 | WSHNGTNZN3 | 6855 | 2001-05-11 | Yes |
| 240-482 | WSHNGTNZN2 | 829J | — | Yes |
| 240-483 | WSHNGTNZN2 | 318J | — | Yes |
| 240-484 | LAUREL236 | 4036 | 2017-06-12 | Yes |
| 240-485 | WSHNGTNZN3 | 829J | — | Yes |
| 240-486 | WSNG236Z14 | 6855 | 2001-03-12 | Yes |
| 240-487 | WSHNGTNZN4 | 829J | — | Yes |
| 240-488 | OAKLAND | 836G | 2012-05-16 | Yes |
| 240-489 | POOLESVL | 7229 | 2001-02-13 | Yes |
| 240-490 | MIDDLETOWN | 6855 | 2001-06-12 | Yes |
| 240-491 | WSHNGTNZN3 | 6119 | — | Yes |
| 240-492 | WSHNGTNZN5 | 829J | — | Yes |
| 240-493 | WSHNGTNZN6 | 829J | — | Yes |
| 240-494 | WSHNGTNZN3 | 829J | 2001-05-09 | Yes |
| 240-495 | WSHNGTNZN4 | 6395 | 2013-10-29 | Yes |
| 240-496 | LEONARDTN | 6395 | 2016-03-17 | Yes |
| 240-497 | WSHNGTNZN2 | 9212 | — | Yes |
| 240-498 | WSHNGTNZN2 | 6855 | — | Yes |
| 240-499 | WSNGTNZN10 | 829J | — | 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.