All assignees
283 prefixes in 531 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 531-403 | OMAHA | 7144 | 2025-04-08 | Yes |
| 531-404 | OMAHA | 7144 | 2025-04-08 | Yes |
| 531-405 | OMAHA | 7144 | 2025-04-08 | Yes |
| 531-406 | OMAHA | 7144 | 2025-05-23 | Yes |
| 531-407 | OMAHA | 7144 | 2025-05-23 | Yes |
| 531-408 | OMAHA | 7144 | 2025-05-23 | Yes |
| 531-409 | OMAHA | 7144 | 2025-05-23 | Yes |
| 531-410 | OMAHA | 7144 | 2025-05-23 | Yes |
| 531-411 | XXXXXXXXXX | MULT | — | — |
| 531-414 | MADISON | 549E | 2018-04-20 | Yes |
| 531-422 | OMAHA | 7144 | 2025-06-03 | Yes |
| 531-423 | OMAHA | 7144 | 2025-06-03 | Yes |
| 531-424 | OMAHA | 7144 | 2025-06-03 | Yes |
| 531-425 | OMAHA | 7144 | 2025-06-03 | Yes |
| 531-426 | OMAHA | 7144 | 2025-06-03 | Yes |
| 531-427 | LINCOLN | 700J | 2025-07-11 | Yes |
| 531-428 | ALLEN | 7421 | 2025-09-12 | Yes |
| 531-430 | OMAHA | 549E | 2025-09-24 | Yes |
| 531-431 | SUPERIOR | 5807 | 2025-09-26 | Yes |
| 531-432 | OMAHA | 7144 | 2025-10-23 | Yes |
| 531-433 | OMAHA | 733J | 2025-10-23 | Yes |
| 531-434 | OMAHA | 700J | 2025-12-05 | Yes |
| 531-435 | HOWELLS | 6701 | 2026-02-05 | Yes |
| 531-436 | CHAMBERS | 6701 | 2025-11-25 | Yes |
| 531-437 | OMAHA | 597J | 2026-03-18 | Yes |
| 531-438 | ELGIN | 960H | 2026-09-10 | Yes |
| 531-441 | MEAD | 6534 | 2022-09-23 | Yes |
| 531-444 | OMAHA | 318J | — | Yes |
| 531-455 | TALMAGE | 995E | 2018-07-27 | Yes |
| 531-459 | UTICA | 6534 | 2017-08-10 | Yes |
| 531-465 | OMAHA | 883K | 2026-06-03 | Yes |
| 531-466 | OMAHA | 197D | 2018-03-27 | Yes |
| 531-484 | OMAHA | 3233 | 2018-03-07 | Yes |
| 531-495 | OMAHA | 490J | 2021-12-29 | Yes |
| 531-500 | LINCOLN | 907K | 2016-04-12 | Yes |
| 531-510 | LINCOLN | 624H | 2019-10-29 | Yes |
| 531-511 | XXXXXXXXXX | MULT | — | — |
| 531-519 | WAYNE | 6874 | 2018-01-12 | Yes |
| 531-521 | DAVEY | 549E | 2019-03-06 | Yes |
| 531-530 | LINCOLN | 549E | 2019-02-15 | Yes |
| 531-531 | SOSIOUX CY | 883K | 2026-06-03 | Yes |
| 531-533 | GUIDE ROCK | 549E | 2019-03-06 | Yes |
| 531-534 | DEWEESE | 549E | 2020-04-03 | Yes |
| 531-535 | KENESAW | 549E | 2019-03-07 | Yes |
| 531-541 | OMAHA | 444H | 2019-11-15 | Yes |
| 531-551 | DUNBAR | 549E | 2020-04-03 | Yes |
| 531-555 | DIR ASST | MULT | — | — |
| 531-557 | OMAHA | 9631 | 2018-06-05 | Yes |
| 531-559 | OMAHA | 3233 | 2021-02-09 | Yes |
| 531-571 | WAKEFIELD | 549E | 2016-03-24 | Yes |
| 531-587 | LINCOLN | 883K | 2026-07-02 | Yes |
| 531-600 | OMAHA | 907K | 2015-03-10 | Yes |
| 531-611 | XXXXXXXXXX | MULT | — | — |
| 531-622 | OMAHA | 318J | — | Yes |
| 531-625 | SOSIOUX CY | 6529 | 2019-06-25 | Yes |
| 531-666 | FREMONT | 965H | 2019-01-28 | Yes |
| 531-667 | — | — | ||
| 531-700 | — | — | ||
| 531-710 | OMAHA | 624H | 2019-10-24 | Yes |
| 531-711 | XXXXXXXXXX | MULT | — | — |
| 531-721 | OMAHA | 012E | 2016-04-25 | Yes |
| 531-727 | SEWARD | 012E | 2015-10-15 | Yes |
| 531-739 | LINCOLN | 5807 | — | Yes |
| 531-772 | OMAHA | 318J | 2018-03-05 | Yes |
| 531-776 | AINSWORTH | 549E | 2021-04-29 | Yes |
| 531-777 | OMAHA | 549E | 2017-02-07 | Yes |
| 531-795 | LINCOLN | 907K | 2025-09-03 | Yes |
| 531-800 | OMAHA | 965H | 2019-01-28 | Yes |
| 531-810 | LINCOLN | 549E | 2021-04-13 | Yes |
| 531-811 | XXXXXXXXXX | MULT | — | — |
| 531-867 | OMAHA | 939H | 2019-06-20 | Yes |
| 531-888 | O NEILL | 073H | 2017-03-09 | Yes |
| 531-893 | LINCOLN | 506J | 2022-01-10 | Yes |
| 531-895 | OMAHA | 506J | 2020-10-22 | Yes |
| 531-900 | WEST POINT | 965H | 2020-08-17 | Yes |
| 531-910 | OMAHA | 549E | 2021-04-13 | Yes |
| 531-911 | XXXXXXXXXX | MULT | — | — |
| 531-950 | — | — | ||
| 531-958 | — | — | ||
| 531-959 | — | — | ||
| 531-976 | — | — | ||
| 531-985 | OMAHA | 907K | 2025-09-03 | Yes |
| 531-999 | OMAHA | 145J | 2019-01-11 | 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.