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64 prefixes in 531 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 531-200 | OMAHA | 549E | 2015-11-19 | Yes |
| 531-201 | OMAHA | 549E | 2015-12-08 | Yes |
| 531-204 | NORFOLK | 549E | 2016-11-09 | Yes |
| 531-208 | ATKINSON | 549E | 2016-03-23 | Yes |
| 531-214 | PILGER | 549E | 2017-10-27 | Yes |
| 531-221 | SO YANKTON | 549E | 2019-05-01 | Yes |
| 531-222 | OMAHA | 549E | 2016-02-18 | Yes |
| 531-223 | HOWELLS | 549E | 2018-04-27 | Yes |
| 531-227 | CLARKSON | 549E | 2018-10-15 | Yes |
| 531-230 | COLUMBUS | 549E | 2019-07-18 | Yes |
| 531-231 | CLAYCENTER | 549E | 2019-03-06 | Yes |
| 531-233 | OMAHA | 549E | 2017-08-22 | Yes |
| 531-234 | NEWMAN GRV | 549E | 2018-10-24 | Yes |
| 531-235 | EMERSON | 549E | 2019-08-22 | Yes |
| 531-236 | HUMPHREY | 549E | 2019-08-22 | Yes |
| 531-237 | PENDER | 549E | 2019-08-22 | Yes |
| 531-238 | RANDOLPH | 549E | 2019-08-23 | Yes |
| 531-251 | DAWSON | 549E | 2019-03-06 | Yes |
| 531-253 | OTOE | 549E | 2020-04-03 | Yes |
| 531-283 | OMAHA | 549E | — | Yes |
| 531-300 | CRESTON | 549E | 2016-03-23 | Yes |
| 531-301 | OMAHA | 549E | 2015-11-19 | 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 |
| 531-322 | CERESCO | 549E | 2021-06-23 | Yes |
| 531-323 | JULIAN | 549E | 2023-04-12 | Yes |
| 531-325 | OMAHA | 549E | 2023-05-31 | Yes |
| 531-327 | WESTERN | 549E | 2023-06-23 | Yes |
| 531-328 | FAIRBURY | 549E | 2023-06-27 | Yes |
| 531-331 | MARTELL | 549E | 2019-03-07 | Yes |
| 531-332 | OSCEOLA | 549E | 2023-06-27 | Yes |
| 531-334 | OHIOWA | 549E | 2023-08-04 | Yes |
| 531-336 | BENNET | 549E | 2023-08-04 | Yes |
| 531-337 | PLATTE CTR | 549E | 2023-08-04 | Yes |
| 531-339 | AVOCA | 549E | 2023-08-04 | Yes |
| 531-341 | CARLETON | 549E | 2023-08-17 | Yes |
| 531-342 | ONG | 549E | 2023-08-17 | Yes |
| 531-351 | TABLE ROCK | 549E | 2019-03-07 | Yes |
| 531-353 | WAHOO | 549E | 2020-10-26 | 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 |
| 531-365 | OMAHA | 549E | 2015-11-19 | Yes |
| 531-366 | OMAHA | 549E | 2024-03-26 | Yes |
| 531-371 | NORFOLK | 549E | 2025-02-06 | Yes |
| 531-372 | OMAHA | 549E | 2025-02-06 | 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 |
| 531-414 | MADISON | 549E | 2018-04-20 | Yes |
| 531-430 | OMAHA | 549E | 2025-09-24 | Yes |
| 531-521 | DAVEY | 549E | 2019-03-06 | Yes |
| 531-530 | LINCOLN | 549E | 2019-02-15 | 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 |
| 531-551 | DUNBAR | 549E | 2020-04-03 | Yes |
| 531-571 | WAKEFIELD | 549E | 2016-03-24 | Yes |
| 531-776 | AINSWORTH | 549E | 2021-04-29 | Yes |
| 531-777 | OMAHA | 549E | 2017-02-07 | Yes |
| 531-810 | LINCOLN | 549E | 2021-04-13 | Yes |
| 531-910 | OMAHA | 549E | 2021-04-13 | 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.