All assignees
283 prefixes in 531 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 531-200 | OMAHA | 549E | 2015-11-19 | Yes |
| 531-201 | OMAHA | 549E | 2015-12-08 | Yes |
| 531-202 | OAKLAND | 073H | — | Yes |
| 531-203 | OMAHA | 5807 | 2015-08-12 | Yes |
| 531-204 | NORFOLK | 549E | 2016-11-09 | Yes |
| 531-205 | OMAHA | 5807 | 2015-11-10 | Yes |
| 531-206 | AINSWORTH | 6263 | 2018-08-24 | Yes |
| 531-207 | LINCOLN | 793K | 2017-08-10 | Yes |
| 531-208 | ATKINSON | 549E | 2016-03-23 | Yes |
| 531-209 | BLAIR | 5807 | 2016-03-31 | Yes |
| 531-210 | OMAHA | 6701 | 2016-05-10 | Yes |
| 531-211 | XXXXXXXXXX | MULT | — | — |
| 531-212 | OAKLAND | 5807 | 2016-01-28 | Yes |
| 531-213 | OMAHA | 7229 | — | Yes |
| 531-214 | PILGER | 549E | 2017-10-27 | Yes |
| 531-215 | OMAHA | 073H | 2017-01-04 | Yes |
| 531-216 | SCHUYLER | 7229 | 2017-12-21 | Yes |
| 531-217 | PLATTSMTH | 6534 | — | Yes |
| 531-218 | LINCOLN | 6701 | 2017-03-24 | Yes |
| 531-219 | FREMONT | 7421 | 2017-08-16 | Yes |
| 531-220 | LINCOLN | 995E | 2016-06-22 | 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 |
| 531-224 | AUBURN | 7229 | 2015-12-24 | Yes |
| 531-225 | OMAHA | 478H | 2018-09-25 | Yes |
| 531-226 | OMAHA | 508J | 2018-10-05 | Yes |
| 531-227 | CLARKSON | 549E | 2018-10-15 | Yes |
| 531-228 | PLATTSMTH | 5807 | 2018-11-07 | Yes |
| 531-229 | LINCOLN | 6701 | 2018-12-04 | Yes |
| 531-230 | COLUMBUS | 549E | 2019-07-18 | Yes |
| 531-231 | CLAYCENTER | 549E | 2019-03-06 | Yes |
| 531-232 | OMAHA | 6534 | 2019-06-10 | 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 |
| 531-239 | OMAHA | 5562 | 2019-06-20 | Yes |
| 531-240 | ASHLAND | 5807 | 2020-02-13 | Yes |
| 531-241 | OMAHA | 7144 | 2020-05-20 | Yes |
| 531-242 | OMAHA | 5807 | 2020-03-24 | Yes |
| 531-243 | BRUNING | 6534 | 2020-05-21 | Yes |
| 531-244 | PLATTSMTH | 318J | — | Yes |
| 531-245 | HARVARD | 6534 | 2020-06-03 | Yes |
| 531-246 | SUPERIOR | 6534 | 2020-06-04 | Yes |
| 531-247 | OMAHA | 425J | 2020-06-29 | Yes |
| 531-248 | LINCOLN | 6701 | — | Yes |
| 531-249 | LINCOLN | 197D | 2020-07-06 | Yes |
| 531-250 | OMAHA | 5807 | 2020-10-26 | Yes |
| 531-251 | DAWSON | 549E | 2019-03-06 | Yes |
| 531-252 | CRESTON | 995E | 2020-12-17 | Yes |
| 531-253 | OTOE | 549E | 2020-04-03 | Yes |
| 531-254 | LINCOLN | 907K | 2021-03-05 | Yes |
| 531-255 | OMAHA | 792K | 2021-03-04 | Yes |
| 531-256 | OMAHA | 318J | 2021-01-29 | Yes |
| 531-257 | VALENTINE | 907K | 2021-03-08 | Yes |
| 531-258 | SO GREGORY | 6534 | 2021-03-10 | Yes |
| 531-259 | BRISTOW | 5807 | 2017-04-07 | Yes |
| 531-260 | NEHAWKA | 6534 | 2021-03-12 | Yes |
| 531-261 | WEEPINGWTR | 6534 | 2021-03-12 | Yes |
| 531-262 | OMAHA | 5807 | 2021-04-08 | Yes |
| 531-263 | OMAHA | 6701 | 2021-04-14 | Yes |
| 531-264 | FIRTH | 995E | 2022-01-27 | Yes |
| 531-265 | SOSIOUX CY | 6534 | 2021-04-28 | Yes |
| 531-266 | RUSKIN | 6534 | 2020-10-15 | Yes |
| 531-267 | OMAHA | 515J | 2021-05-06 | Yes |
| 531-268 | ATKINSON | 3233 | 2021-05-03 | Yes |
| 531-269 | NORFOLK | 495J | 2021-05-25 | Yes |
| 531-270 | OMAHA | 6701 | 2022-06-10 | Yes |
| 531-271 | O NEILL | 6263 | 2021-08-24 | Yes |
| 531-272 | OMAHA | 5562 | 2020-04-02 | Yes |
| 531-273 | DE WITT | 995E | 2022-02-01 | Yes |
| 531-274 | WAYNE | 6263 | 2021-10-01 | Yes |
| 531-275 | HOWELLS | 6263 | 2021-04-16 | Yes |
| 531-276 | MILFORD | 907K | 2022-03-08 | Yes |
| 531-277 | OMAHA | 7144 | 2018-02-22 | Yes |
| 531-278 | LINCOLN | 073H | 2021-12-10 | Yes |
| 531-279 | GENOA | 5807 | 2021-11-02 | Yes |
| 531-280 | LINCOLN | 490J | 2022-02-04 | Yes |
| 531-281 | TEKAMAH | 6701 | 2021-12-23 | Yes |
| 531-282 | BEATRICE | 6534 | 2021-11-22 | Yes |
| 531-283 | OMAHA | 549E | — | Yes |
| 531-284 | OMAHA | 732J | — | Yes |
| 531-285 | SHICKLEY | 885E | 2022-06-27 | Yes |
| 531-286 | OAKLAND | 3233 | 2022-08-09 | Yes |
| 531-287 | AUBURN | 6263 | 2022-09-08 | Yes |
| 531-288 | MADISON | 6534 | 2022-08-04 | Yes |
| 531-289 | LINCOLN | 793K | — | Yes |
| 531-290 | PILGER | 6534 | 2022-09-23 | Yes |
| 531-291 | CRETE | 5807 | 2022-04-08 | Yes |
| 531-292 | VALENTINE | 6701 | 2021-04-26 | Yes |
| 531-293 | SCHUYLER | 6263 | 2022-09-08 | Yes |
| 531-294 | NEBRASKACY | 6701 | 2022-09-16 | Yes |
| 531-295 | LAUREL | 3233 | 2022-11-09 | Yes |
| 531-296 | CEDAR BLF | 6534 | 2022-09-23 | Yes |
| 531-297 | WAKEFIELD | 6534 | 2022-09-23 | Yes |
| 531-298 | DORCHESTER | 995E | 2022-02-01 | Yes |
| 531-299 | OMAHA | 318J | — | 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.