All assignees
709 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-601 | SELLS | 6572 | 2021-12-17 | Yes |
| 520-602 | TUCSON | 624H | 2023-08-17 | Yes |
| 520-603 | TUCSON | 6572 | — | — |
| 520-604 | NOGALES | 6572 | — | Yes |
| 520-605 | TUCSON | 587F | 2021-10-25 | Yes |
| 520-606 | TUCSON | 5562 | 2014-02-05 | Yes |
| 520-607 | CASAGRANDE | 6010 | 2021-12-17 | Yes |
| 520-608 | SAN MANUEL | 630E | 2022-01-25 | Yes |
| 520-609 | TUCSON | 6572 | — | Yes |
| 520-610 | SACATON | 6572 | — | Yes |
| 520-611 | XXXXXXXXXX | MULT | — | — |
| 520-612 | TUCSON | 587F | 2012-05-22 | Yes |
| 520-613 | TUCSON | 6010 | 2022-01-07 | Yes |
| 520-614 | TUCSON | 630E | 2022-02-24 | Yes |
| 520-615 | TUCSON | 9636 | — | — |
| 520-616 | TUCSON | 9636 | — | Yes |
| 520-617 | TUCSON | 9636 | — | — |
| 520-618 | TUCSON | 7552 | — | Yes |
| 520-619 | NOGALES | 6529 | 2001-05-15 | Yes |
| 520-620 | TUCSON | 9636 | — | — |
| 520-621 | TUCSON | 9636 | — | — |
| 520-622 | TUCSON | 9636 | — | — |
| 520-623 | TUCSON | 9636 | — | — |
| 520-624 | TUCSON | 9636 | — | — |
| 520-625 | TUCSON | 9636 | — | — |
| 520-626 | TUCSON | 9636 | — | — |
| 520-627 | TUCSON | 6572 | 2022-01-18 | Yes |
| 520-628 | TUCSON | 9636 | — | Yes |
| 520-629 | TUCSON | 9636 | — | — |
| 520-630 | WILLCOX | 630E | 2021-12-02 | Yes |
| 520-631 | TUCSON | 6529 | — | Yes |
| 520-632 | CASAGRANDE | 6572 | 2021-12-15 | Yes |
| 520-633 | TUCSON | 6572 | 2022-01-08 | Yes |
| 520-634 | CASAGRANDE | 6529 | 2022-03-10 | Yes |
| 520-635 | CASAGRANDE | 6529 | 2015-04-07 | Yes |
| 520-636 | SAN MANUEL | 579F | 2015-09-30 | Yes |
| 520-637 | CASAGRANDE | 6529 | 2020-12-23 | Yes |
| 520-638 | TUCSON | 9636 | 2008-04-28 | Yes |
| 520-639 | TUCSON | 508J | 2015-04-17 | Yes |
| 520-640 | TUCSON | 3285 | 2022-04-15 | Yes |
| 520-641 | BENSON | 516J | 2022-02-18 | Yes |
| 520-642 | ELFRIDA | 2176 | — | — |
| 520-643 | WILLCOX | 6572 | 2022-03-28 | Yes |
| 520-644 | KOMATKE | 965H | 2020-09-24 | Yes |
| 520-645 | DOUGLAS | 6572 | 2013-09-30 | Yes |
| 520-646 | NOGALES | 516J | 2022-02-18 | Yes |
| 520-647 | TUCSON | 9636 | — | Yes |
| 520-648 | TUCSON | 9636 | — | — |
| 520-649 | TUCSON | 6572 | 2022-08-10 | Yes |
| 520-650 | WHITLOW | 630E | 2020-10-29 | Yes |
| 520-651 | TUCSON | 6572 | 2022-07-14 | Yes |
| 520-652 | WHITLOW | 9636 | 2022-03-01 | Yes |
| 520-653 | TUCSON | 587F | 2022-07-20 | Yes |
| 520-654 | SIERRAVIST | 939H | 2022-08-25 | Yes |
| 520-655 | SUPERIOR | 965H | 2020-06-02 | Yes |
| 520-656 | WILLCOX | 6572 | 2022-10-27 | Yes |
| 520-657 | HAYDEN | 587F | 2022-10-04 | Yes |
| 520-658 | TUCSON | 6529 | 2014-10-24 | Yes |
| 520-659 | NOGALES | 732J | 2022-09-15 | Yes |
| 520-660 | CASAGRANDE | 6529 | 2022-09-20 | Yes |
| 520-661 | TUCSON | 6529 | — | Yes |
| 520-662 | TUCSON | 9636 | 2004-06-11 | Yes |
| 520-663 | TUCSON | 9636 | — | — |
| 520-664 | TUCSON | 9636 | — | Yes |
| 520-665 | TUCSON | 9636 | — | Yes |
| 520-666 | CASAGRANDE | 630E | 2017-09-12 | Yes |
| 520-667 | TUCSON | 732J | 2023-02-13 | Yes |
| 520-668 | TUCSON | 6572 | 2002-05-08 | Yes |
| 520-669 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-670 | TUCSON | 9636 | — | — |
| 520-671 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-672 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-673 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-674 | SIERRAVIST | 7465 | 2023-03-09 | Yes |
| 520-675 | TUCSON | 490J | 2023-04-14 | Yes |
| 520-676 | WILLCOX | 6572 | 2025-06-06 | Yes |
| 520-677 | CASAGRANDE | 490J | 2023-04-18 | Yes |
| 520-678 | SIERRAVIST | 6572 | — | — |
| 520-679 | TOMBSTONE | 6572 | 2023-06-08 | Yes |
| 520-680 | BISBEE | 630E | 2023-06-22 | Yes |
| 520-681 | NOGALES | 3285 | 2023-06-26 | Yes |
| 520-682 | TUCSON | 9636 | — | — |
| 520-683 | CASAGRANDE | 630E | 2023-08-11 | Yes |
| 520-684 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-685 | SIERRAVIST | 318J | — | Yes |
| 520-686 | BENSON | 6572 | 2004-06-08 | Yes |
| 520-687 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-688 | CASAGRANDE | 965H | 2021-09-15 | Yes |
| 520-689 | SUPERIOR | 9636 | — | Yes |
| 520-690 | TUCSON | 9636 | — | — |
| 520-691 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-692 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-693 | SIERRAVIST | 7465 | 2023-08-31 | Yes |
| 520-694 | TUCSON | 7552 | — | — |
| 520-695 | TUCSON | 9636 | — | — |
| 520-696 | TUCSON | 9636 | — | — |
| 520-697 | TUCSON | 6572 | 2023-09-06 | Yes |
| 520-698 | WILLCOX | 6572 | 2023-10-18 | Yes |
| 520-699 | SIERRAVIST | 965H | 2021-10-15 | Yes |
| 520-700 | — | — |
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.