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11 prefixes in 331 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 331-287 | AURORA | 984E | 2022-07-20 | Yes |
| 331-303 | ELBURN | 984E | — | Yes |
| 331-308 | BARTLETT | 984E | 2014-12-23 | Yes |
| 331-310 | BIG ROCK | 984E | 2014-12-29 | Yes |
| 331-318 | LEMONT | 984E | — | Yes |
| 331-431 | AURORA | 984E | 2010-05-26 | Yes |
| 331-642 | ELMHURST | 984E | — | Yes |
| 331-704 | KANEVILLE | 984E | 2015-04-21 | Yes |
| 331-808 | PLANO | 984E | 2015-06-05 | Yes |
| 331-901 | ST CHARLES | 984E | 2015-04-23 | Yes |
| 331-999 | OSWEGO | 984E | 2010-09-22 | 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.