All assignees
283 prefixes in 531 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 531-300 | CRESTON | 549E | 2016-03-23 | Yes |
| 531-301 | OMAHA | 549E | 2015-11-19 | Yes |
| 531-302 | TECUMSEH | 939H | 2022-11-09 | Yes |
| 531-303 | POLK | 6534 | 2022-09-23 | Yes |
| 531-304 | PENDER | 6534 | 2022-11-16 | Yes |
| 531-305 | HICKMAN | 3233 | 2022-11-16 | Yes |
| 531-306 | MURRAY | 3233 | 2022-12-14 | Yes |
| 531-307 | HOMER | 3233 | 2023-01-03 | Yes |
| 531-308 | MALCOLM | 793K | 2024-05-23 | Yes |
| 531-309 | EDGAR | 995E | 2015-08-27 | Yes |
| 531-310 | LINCOLN | 939H | 2022-04-04 | Yes |
| 531-311 | XXXXXXXXXX | MULT | — | — |
| 531-312 | TAMORA | 6534 | 2022-09-23 | Yes |
| 531-313 | HASTINGS | 6534 | 2024-12-11 | Yes |
| 531-314 | W HAMBURG | 3233 | 2023-01-03 | Yes |
| 531-315 | BLAIR | 3233 | 2023-01-18 | Yes |
| 531-316 | HASTINGS | 732J | 2023-03-14 | Yes |
| 531-317 | HALLAM | 549E | 2023-04-12 | Yes |
| 531-318 | WILBER | 549E | 2023-04-12 | Yes |
| 531-319 | DAVENPORT | 549E | 2023-04-12 | Yes |
| 531-320 | GRAFTON | 549E | 2023-04-12 | Yes |
| 531-321 | ADAMS | 5807 | 2019-02-14 | Yes |
| 531-322 | CERESCO | 549E | 2021-06-23 | Yes |
| 531-323 | JULIAN | 549E | 2023-04-12 | Yes |
| 531-324 | LINCOLN | 732J | 2023-04-20 | Yes |
| 531-325 | OMAHA | 549E | 2023-05-31 | Yes |
| 531-326 | COLUMBUS | 6701 | 2023-06-13 | Yes |
| 531-327 | WESTERN | 549E | 2023-06-23 | Yes |
| 531-328 | FAIRBURY | 549E | 2023-06-27 | Yes |
| 531-329 | OMAHA | 7229 | 2015-10-19 | Yes |
| 531-330 | WAYNE | 939H | 2023-03-07 | Yes |
| 531-331 | MARTELL | 549E | 2019-03-07 | Yes |
| 531-332 | OSCEOLA | 549E | 2023-06-27 | Yes |
| 531-333 | LINCOLN | 508J | 2013-02-13 | Yes |
| 531-334 | OHIOWA | 549E | 2023-08-04 | Yes |
| 531-335 | WEST POINT | 7229 | 2018-02-22 | Yes |
| 531-336 | BENNET | 549E | 2023-08-04 | Yes |
| 531-337 | PLATTE CTR | 549E | 2023-08-04 | Yes |
| 531-338 | DAVID CITY | 6534 | 2022-09-23 | Yes |
| 531-339 | AVOCA | 549E | 2023-08-04 | Yes |
| 531-340 | CLARKSON | 939H | 2023-08-10 | Yes |
| 531-341 | CARLETON | 549E | 2023-08-17 | Yes |
| 531-342 | ONG | 549E | 2023-08-17 | Yes |
| 531-343 | CRESTON | 939H | 2023-08-22 | Yes |
| 531-344 | FREMONT | 6701 | 2023-08-29 | Yes |
| 531-345 | LINDSAY | 965H | 2021-07-19 | Yes |
| 531-346 | OMAHA | 6701 | 2023-10-20 | Yes |
| 531-347 | — | — | ||
| 531-348 | COLUMBUS | 6534 | 2023-10-23 | Yes |
| 531-349 | SOSIOUX CY | 6529 | 2023-10-31 | Yes |
| 531-350 | LINCOLN | 515J | 2023-11-09 | Yes |
| 531-351 | TABLE ROCK | 549E | 2019-03-07 | Yes |
| 531-352 | OMAHA | 490J | 2024-01-09 | Yes |
| 531-353 | WAHOO | 549E | 2020-10-26 | Yes |
| 531-354 | OMAHA | 5807 | 2024-01-11 | Yes |
| 531-355 | OMAHA | 508J | 2016-03-21 | Yes |
| 531-356 | BUTTE | 965H | 2021-07-19 | Yes |
| 531-357 | AINSWORTH | 939H | 2024-01-17 | Yes |
| 531-358 | LOUISVILLE | 5807 | 2024-02-07 | Yes |
| 531-359 | OMAHA | 907K | 2024-02-14 | Yes |
| 531-360 | ALBION | 549E | 2024-02-14 | Yes |
| 531-361 | FREMONT | 549E | 2024-02-22 | Yes |
| 531-362 | BEATRICE | 549E | 2024-02-22 | Yes |
| 531-363 | LINCOLN | 5807 | 2025-01-16 | Yes |
| 531-364 | GENEVA | 5807 | 2024-03-06 | Yes |
| 531-365 | OMAHA | 549E | 2015-11-19 | Yes |
| 531-366 | OMAHA | 549E | 2024-03-26 | Yes |
| 531-367 | RANDOLPH | 5807 | 2024-05-20 | Yes |
| 531-368 | SHELBY | 624H | 2024-04-19 | Yes |
| 531-369 | SYRACUSE | 5807 | 2024-06-11 | Yes |
| 531-370 | FREMONT | 907K | 2024-09-03 | Yes |
| 531-371 | NORFOLK | 549E | 2025-02-06 | Yes |
| 531-372 | OMAHA | 549E | 2025-02-06 | Yes |
| 531-373 | HEBRON | 5807 | 2025-03-07 | Yes |
| 531-374 | VALENTINE | 6701 | 2025-03-19 | Yes |
| 531-375 | OMAHA | 5562 | 2017-03-24 | Yes |
| 531-376 | AURORA | 6701 | 2025-03-19 | Yes |
| 531-377 | WAHOO | 6701 | 2025-03-19 | Yes |
| 531-378 | — | — | ||
| 531-379 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-380 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-381 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-382 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-383 | — | — | ||
| 531-384 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-385 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-386 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-387 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-388 | AURORA | 6263 | 2025-03-21 | Yes |
| 531-389 | OMAHA | 5807 | 2018-03-05 | Yes |
| 531-390 | CREIGHTON | 5562 | 2025-03-26 | Yes |
| 531-391 | SCHUYLER | 5562 | 2025-03-26 | Yes |
| 531-392 | WEST POINT | 5562 | 2025-03-26 | Yes |
| 531-393 | OMAHA | 7229 | 2017-02-27 | Yes |
| 531-394 | ASHLAND | 5562 | 2025-03-27 | Yes |
| 531-395 | OMAHA | 549E | 2025-04-08 | Yes |
| 531-396 | LINCOLN | 549E | 2025-04-16 | Yes |
| 531-400 | COLUMBUS | 549E | 2021-03-08 | Yes |
| 531-401 | OMAHA | 7144 | 2025-04-08 | Yes |
| 531-402 | OMAHA | 7144 | 2025-04-08 | 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.