All assignees
709 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-818 | TUCSON | 9636 | — | Yes |
| 520-820 | TUCSON | 6572 | — | Yes |
| 520-822 | TUCSON | 9636 | — | Yes |
| 520-823 | SASABE | 2171 | — | Yes |
| 520-824 | SUNIZONA | 2176 | — | — |
| 520-825 | TUCSON | 9636 | — | — |
| 520-826 | PEARCE | 2176 | — | — |
| 520-827 | SUPERIOR | 6572 | — | Yes |
| 520-829 | TUCSON | 3285 | 2001-08-17 | Yes |
| 520-831 | PRESCOTT | 6529 | — | Yes |
| 520-833 | TUCSON | 6572 | — | Yes |
| 520-834 | TUCSON | 6010 | 2001-10-17 | Yes |
| 520-836 | CASAGRANDE | 9636 | — | — |
| 520-837 | TUCSON | 7217 | — | Yes |
| 520-838 | TUCSON | 9636 | 2001-01-26 | Yes |
| 520-839 | NOGALES | 6529 | — | Yes |
| 520-840 | CASAGRANDE | 6572 | — | Yes |
| 520-841 | NOGALES | 6010 | — | Yes |
| 520-842 | NOGALES | 630E | — | — |
| 520-843 | SIERRAVIST | 630E | — | — |
| 520-844 | TUCSON | 630E | — | — |
| 520-845 | SAN SIMON | 2176 | — | — |
| 520-847 | BOWIE | 2176 | — | — |
| 520-848 | TUCSON | 5562 | 2015-01-19 | Yes |
| 520-849 | TUCSON | 6572 | 2017-06-15 | Yes |
| 520-850 | TUCSON | 6572 | — | — |
| 520-851 | SIERRAVIST | 7217 | 2024-10-22 | Yes |
| 520-852 | SIERRAVIST | 7217 | 2024-10-22 | Yes |
| 520-853 | SIERRAVIST | 7217 | 2024-10-22 | Yes |
| 520-854 | SIERRAVIST | 7217 | 2024-10-22 | Yes |
| 520-855 | SIERRAVIST | 7217 | 2024-10-22 | Yes |
| 520-858 | CASAGRANDE | 9636 | 2007-11-07 | Yes |
| 520-860 | NOGALES | 6572 | — | Yes |
| 520-861 | TUCSON | 6529 | — | Yes |
| 520-866 | CASAGRANDE | 9636 | 2001-08-17 | Yes |
| 520-867 | TUCSON | 6010 | 2001-11-19 | Yes |
| 520-868 | CASAGRANDE | 9636 | — | — |
| 520-869 | TUCSON | 6529 | — | Yes |
| 520-870 | TUCSON | 6529 | — | Yes |
| 520-872 | TUCSON | 9636 | — | — |
| 520-873 | TUCSON | 9636 | — | Yes |
| 520-874 | TUCSON | 9636 | — | Yes |
| 520-876 | CASAGRANDE | 9636 | — | — |
| 520-877 | TUCSON | 9636 | — | Yes |
| 520-878 | TUCSON | 9636 | — | Yes |
| 520-879 | TUCSON | 9636 | — | — |
| 520-880 | TUCSON | 9636 | — | — |
| 520-881 | TUCSON | 9636 | — | — |
| 520-882 | TUCSON | 9636 | — | — |
| 520-883 | TUCSON | 9636 | — | — |
| 520-884 | TUCSON | 9636 | — | Yes |
| 520-885 | TUCSON | 9636 | — | — |
| 520-886 | TUCSON | 9636 | — | — |
| 520-887 | TUCSON | 9636 | — | — |
| 520-888 | TUCSON | 9636 | — | — |
| 520-889 | TUCSON | 9636 | — | — |
| 520-891 | TUCSON | 6529 | — | — |
| 520-895 | SIERRAVIST | 7552 | — | Yes |
| 520-896 | SAN MANUEL | 9636 | — | Yes |
| 520-898 | SILVERBELL | 2226 | 2002-04-02 | — |
| 520-899 | MARCOPAVLG | 965H | 2020-09-24 | Yes |
| 520-900 | TUCSON | 630E | 2015-08-13 | Yes |
| 520-901 | TUCSON | 7552 | — | Yes |
| 520-903 | TUCSON | 9636 | — | Yes |
| 520-904 | TUCSON | 6572 | — | Yes |
| 520-906 | TUCSON | 6010 | — | — |
| 520-907 | TUCSON | 6010 | — | — |
| 520-908 | TUCSON | 9636 | — | Yes |
| 520-909 | TUCSON | 6572 | — | — |
| 520-910 | TUCSON | 630E | 2021-02-01 | Yes |
| 520-911 | XXXXXXXXXX | MULT | — | — |
| 520-912 | TUCSON | 6010 | 2013-10-24 | Yes |
| 520-917 | TUCSON | 7465 | — | — |
| 520-918 | TUCSON | 7465 | — | — |
| 520-921 | SEDONA | 6529 | — | Yes |
| 520-922 | TUCSON | 883K | 2026-03-09 | Yes |
| 520-924 | NOGALES | 7175 | — | Yes |
| 520-929 | WILLCOX | 516J | 2022-02-18 | Yes |
| 520-934 | TUCSON | 516J | 2021-04-06 | Yes |
| 520-940 | TUCSON | 6529 | — | Yes |
| 520-941 | SIERRAVIST | 7217 | 2023-07-27 | Yes |
| 520-942 | SIERRAVIST | 7217 | 2023-07-27 | Yes |
| 520-943 | SIERRAVIST | 7217 | 2023-07-27 | Yes |
| 520-944 | SIERRAVIST | 7217 | 2023-07-27 | Yes |
| 520-945 | SIERRAVIST | 7217 | 2023-07-27 | Yes |
| 520-949 | SANTA ROSA | 516J | 2022-01-14 | Yes |
| 520-950 | — | — | ||
| 520-954 | TUCSON | 6572 | — | — |
| 520-955 | TUCSON | 6572 | — | Yes |
| 520-958 | — | — | ||
| 520-959 | — | — | ||
| 520-965 | TUCSON | 6529 | 2015-01-02 | Yes |
| 520-966 | SILVERBELL | 965H | 2020-10-19 | Yes |
| 520-971 | TUCSON | 6529 | — | Yes |
| 520-975 | TUCSON | 6572 | — | — |
| 520-976 | — | — | ||
| 520-977 | TUCSON | 6529 | — | Yes |
| 520-979 | TUCSON | 6529 | — | Yes |
| 520-980 | NOGALES | 5562 | — | Yes |
| 520-981 | TUCSON | 6529 | — | 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.