All assignees
709 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-400 | TUCSON | 6572 | — | — |
| 520-401 | TUCSON | 6529 | — | Yes |
| 520-402 | BENSON | 6529 | 2016-09-14 | Yes |
| 520-403 | TUCSON | 6572 | — | — |
| 520-404 | TUCSON | 6572 | — | — |
| 520-405 | TUCSON | 6572 | — | — |
| 520-406 | TUCSON | 6010 | 2001-04-16 | — |
| 520-407 | TUCSON | 9636 | — | Yes |
| 520-408 | TUCSON | 9636 | — | — |
| 520-409 | TUCSON | 6010 | — | — |
| 520-410 | TUCSON | 9636 | — | — |
| 520-411 | XXXXXXXXXX | MULT | — | — |
| 520-412 | TOMBSTONE | 579F | 2018-10-29 | Yes |
| 520-413 | CASAGRANDE | 3285 | 2001-04-16 | Yes |
| 520-414 | CASAGRANDE | 3285 | 2001-04-16 | Yes |
| 520-415 | NOGALES | 593K | 2012-03-05 | Yes |
| 520-416 | TUCSON | 114J | 2019-09-16 | Yes |
| 520-417 | SIERRAVIST | 9636 | — | — |
| 520-418 | STOTONIC | 2179 | — | — |
| 520-419 | TUCSON | 6572 | — | — |
| 520-420 | TUCSON | 321J | 2019-12-18 | Yes |
| 520-421 | CASAGRANDE | 9636 | — | — |
| 520-422 | BISBEE | 7421 | 2012-08-13 | Yes |
| 520-423 | CASAGRANDE | 9636 | — | Yes |
| 520-424 | CASAGRANDE | 9636 | — | Yes |
| 520-425 | TUCSON | 6572 | 2006-11-03 | Yes |
| 520-426 | CASAGRANDE | 9636 | — | — |
| 520-427 | TUCSON | 6529 | 2013-01-11 | Yes |
| 520-428 | TUCSON | 6010 | 2014-01-17 | Yes |
| 520-429 | TUCSON | 6572 | — | Yes |
| 520-430 | MARCOPAVLG | 2179 | — | — |
| 520-431 | CASAGRANDE | 6010 | — | Yes |
| 520-432 | BISBEE | 9636 | — | Yes |
| 520-433 | TUCSON | 3285 | 2012-11-20 | Yes |
| 520-434 | TUCSON | 9636 | — | Yes |
| 520-435 | WILLCOX | 6529 | 2023-05-31 | Yes |
| 520-436 | HAYDEN | 630E | 2019-10-03 | Yes |
| 520-437 | TUCSON | 4793 | 2006-03-30 | Yes |
| 520-438 | WHITLOW | 630E | 2019-10-03 | Yes |
| 520-439 | SIERRAVIST | 9636 | — | — |
| 520-440 | TUCSON | 6529 | — | — |
| 520-441 | TUCSON | 6010 | 2010-04-20 | Yes |
| 520-442 | BENSON | 587F | 2012-09-24 | Yes |
| 520-443 | TUCSON | 6529 | 2007-06-06 | Yes |
| 520-444 | TUCSON | 6572 | — | — |
| 520-445 | TUCSON | 6010 | — | Yes |
| 520-446 | TUCSON | 6630 | — | — |
| 520-447 | TUCSON | 630E | 2014-02-28 | Yes |
| 520-448 | TUCSON | 579F | 2014-04-30 | Yes |
| 520-449 | TUCSON | 6572 | — | Yes |
| 520-450 | CASAGRANDE | 6529 | — | Yes |
| 520-451 | TUCSON | 6572 | 2021-10-28 | Yes |
| 520-452 | SIERRAVIST | 9636 | — | — |
| 520-453 | TOMBSTONE | 6572 | 2020-04-20 | Yes |
| 520-454 | SIERRAVIST | 9636 | 2009-02-13 | Yes |
| 520-455 | NOGALES | 9636 | — | Yes |
| 520-456 | SIERRAVIST | 9636 | — | Yes |
| 520-457 | TOMBSTONE | 9636 | — | Yes |
| 520-458 | SIERRAVIST | 9636 | — | — |
| 520-459 | SIERRAVIST | 9636 | — | — |
| 520-460 | TUCSON | 6529 | 2012-09-17 | Yes |
| 520-461 | TUCSON | 7175 | — | Yes |
| 520-462 | TUCSON | 630E | 2017-08-17 | Yes |
| 520-463 | WHITLOW | 9636 | — | Yes |
| 520-464 | CASAGRANDE | 9636 | — | Yes |
| 520-465 | TUCSON | 6010 | — | — |
| 520-466 | CASAGRANDE | 9636 | — | — |
| 520-467 | TUCSON | 630E | 2019-12-19 | Yes |
| 520-468 | TUCSON | 630E | 2008-05-21 | Yes |
| 520-469 | TUCSON | 9636 | — | — |
| 520-470 | NOGALES | 6529 | — | Yes |
| 520-471 | TUCSON | 6572 | — | — |
| 520-472 | CASAGRANDE | 9636 | 2019-08-26 | Yes |
| 520-473 | SIERRAVIST | 6529 | 2020-11-23 | Yes |
| 520-474 | TUCSON | 6529 | 2012-11-16 | Yes |
| 520-475 | TUCSON | 425J | 2020-06-05 | Yes |
| 520-476 | TUCSON | 478J | 2020-09-01 | Yes |
| 520-477 | TUCSON | 7229 | 2011-01-12 | Yes |
| 520-478 | AJO | 7217 | 2020-10-27 | Yes |
| 520-479 | TUCSON | 6529 | 2020-05-11 | Yes |
| 520-481 | TUCSON | 6529 | — | — |
| 520-482 | TUCSON | 6010 | 2021-07-01 | Yes |
| 520-483 | CASAGRANDE | 6572 | — | Yes |
| 520-484 | TUCSON | 551G | 2012-10-22 | Yes |
| 520-485 | TUCSON | 587F | 2015-05-13 | Yes |
| 520-486 | TUCSON | 6010 | 2020-09-16 | Yes |
| 520-487 | SAN MANUEL | 9636 | — | Yes |
| 520-488 | TUCSON | 6572 | — | — |
| 520-489 | TUCSON | 9636 | — | — |
| 520-490 | TUCSON | 6572 | — | — |
| 520-491 | FLAGSTAFF | 6529 | — | Yes |
| 520-492 | TUCSON | 318J | 2020-10-06 | Yes |
| 520-493 | TUCSON | 5727 | 2019-04-18 | Yes |
| 520-494 | CASAGRANDE | 9636 | — | Yes |
| 520-495 | TUCSON | 7552 | — | Yes |
| 520-496 | TUCSON | 6572 | 2020-10-07 | Yes |
| 520-497 | TUCSON | 587F | 2020-10-07 | Yes |
| 520-498 | TUCSON | 9636 | — | — |
| 520-499 | TUCSON | 6529 | 2013-04-19 | Yes |
| 520-500 | TUCSON | 630E | 2015-02-26 | 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.