All assignees
709 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-701 | CASAGRANDE | 6529 | 2023-11-09 | Yes |
| 520-702 | DOUGLAS | 630E | 2022-01-14 | Yes |
| 520-703 | TUCSON | 475J | 2023-12-08 | Yes |
| 520-704 | TUCSON | 6010 | 2010-02-09 | Yes |
| 520-705 | CASAGRANDE | 6572 | — | — |
| 520-706 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-707 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-708 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-709 | CASAGRANDE | 6572 | — | Yes |
| 520-710 | TUCSON | 624H | 2022-08-10 | Yes |
| 520-711 | XXXXXXXXXX | MULT | — | — |
| 520-712 | TUCSON | 9636 | — | — |
| 520-713 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-714 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-715 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-716 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-717 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-718 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-719 | TUCSON | 587F | 2015-07-23 | Yes |
| 520-720 | BENSON | 9636 | — | Yes |
| 520-721 | TUCSON | 9636 | — | — |
| 520-722 | TUCSON | 9636 | — | — |
| 520-723 | CASAGRANDE | 9636 | — | — |
| 520-724 | TUCSON | 9636 | 2011-02-02 | Yes |
| 520-725 | SIERRAVIST | 7465 | 2024-01-08 | Yes |
| 520-727 | DOUGLAS | 6010 | 2005-08-24 | Yes |
| 520-728 | CASAGRANDE | 6529 | 2024-02-16 | Yes |
| 520-729 | TUCSON | 6572 | 2014-10-17 | Yes |
| 520-730 | TUCSON | 6572 | — | Yes |
| 520-731 | TUCSON | 9636 | — | — |
| 520-732 | SIERRAVIST | 6572 | 2001-05-15 | Yes |
| 520-733 | TUCSON | 9636 | — | — |
| 520-734 | TUCSON | 6572 | 2024-03-01 | Yes |
| 520-735 | SIERRAVIST | 6010 | 2024-03-28 | Yes |
| 520-736 | CASAGRANDE | 6010 | 2024-06-13 | Yes |
| 520-737 | SIERRAVIST | 907K | 2024-06-17 | Yes |
| 520-738 | TUCSON | 6572 | 2024-10-22 | Yes |
| 520-739 | TUCSON | 624H | 2024-11-14 | Yes |
| 520-740 | TUCSON | 9636 | — | — |
| 520-741 | TUCSON | 9636 | — | — |
| 520-742 | TUCSON | 9636 | — | — |
| 520-743 | TUCSON | 9636 | — | Yes |
| 520-744 | TUCSON | 9636 | — | — |
| 520-745 | TUCSON | 9636 | — | — |
| 520-746 | TUCSON | 9636 | — | — |
| 520-747 | TUCSON | 9636 | — | — |
| 520-748 | TUCSON | 9636 | — | — |
| 520-749 | TUCSON | 9636 | — | — |
| 520-750 | TUCSON | 9636 | — | Yes |
| 520-751 | TUCSON | 9636 | — | — |
| 520-752 | CASAGRANDE | 6572 | 2025-01-08 | Yes |
| 520-753 | TUCSON | 6572 | 2025-01-31 | Yes |
| 520-754 | SACATON | 6572 | 2025-02-14 | Yes |
| 520-755 | LONE BUTTE | 965H | 2020-09-24 | Yes |
| 520-756 | TUCSON | 6010 | 2025-03-18 | Yes |
| 520-757 | CASAGRANDE | 6529 | 2025-03-25 | Yes |
| 520-758 | BLACKWATER | 965H | 2020-10-19 | Yes |
| 520-759 | CASAGRANDE | 6572 | 2018-09-10 | Yes |
| 520-760 | TUCSON | 9636 | — | — |
| 520-761 | NOGALES | 9636 | — | — |
| 520-762 | TUCSON | 9636 | — | Yes |
| 520-763 | CASAGRANDE | 6529 | 2025-07-11 | Yes |
| 520-764 | CASAGRANDE | 6529 | 2025-10-28 | Yes |
| 520-765 | CASAGRANDE | 6529 | 2026-01-09 | Yes |
| 520-766 | WILLCOX | 183D | 2005-12-21 | — |
| 520-767 | CASAGRANDE | 6010 | 2026-04-03 | Yes |
| 520-770 | TUCSON | 9636 | — | Yes |
| 520-771 | TUCSON | 197D | 2017-12-20 | Yes |
| 520-772 | SUPERIOR | 516J | 2022-01-14 | Yes |
| 520-775 | TUCSON | 587F | 2014-02-28 | Yes |
| 520-777 | TUCSON | 7552 | 2004-10-27 | Yes |
| 520-779 | WILLCOX | 587F | 2018-09-10 | Yes |
| 520-780 | TUCSON | 6572 | — | Yes |
| 520-783 | TUCSON | 5562 | 2019-02-05 | Yes |
| 520-784 | TUCSON | 9636 | — | Yes |
| 520-785 | TUCSON | 907K | 2025-10-22 | Yes |
| 520-788 | CASAGRANDE | 6529 | 2014-09-22 | Yes |
| 520-789 | TUCSON | 6529 | 2012-02-24 | Yes |
| 520-790 | TUCSON | 9636 | — | — |
| 520-791 | TUCSON | 9636 | — | — |
| 520-792 | TUCSON | 9636 | — | — |
| 520-793 | TUCSON | 9636 | — | — |
| 520-794 | TUCSON | 9636 | — | — |
| 520-795 | TUCSON | 9636 | — | — |
| 520-796 | LONE BUTTE | 2179 | — | — |
| 520-797 | TUCSON | 9636 | — | — |
| 520-798 | TUCSON | 9636 | — | — |
| 520-799 | TUCSON | 9636 | — | — |
| 520-800 | TUCSON | 630E | 2015-01-28 | Yes |
| 520-801 | TUCSON | 410H | 2025-04-18 | Yes |
| 520-802 | TUCSON | 616J | 2025-10-01 | Yes |
| 520-803 | SIERRAVIST | 9636 | — | — |
| 520-805 | DOUGLAS | 9636 | — | Yes |
| 520-806 | TUCSON | 9636 | — | Yes |
| 520-807 | TUCSON | 9636 | — | — |
| 520-808 | TUCSON | 6010 | 2001-08-17 | — |
| 520-809 | TUCSON | 890G | 2014-12-23 | Yes |
| 520-811 | XXXXXXXXXX | MULT | — | — |
| 520-812 | TUCSON | 587F | 2011-04-19 | Yes |
| 520-815 | TUCSON | 587F | 2015-03-10 | 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.