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18 prefixes in 331 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 331-299 | HINSDALE | 965H | 2021-01-04 | Yes |
| 331-336 | AURORA | 965H | 2019-10-11 | Yes |
| 331-345 | NAPERVILLE | 965H | 2020-11-18 | Yes |
| 331-348 | ELBURN | 965H | 2019-10-11 | Yes |
| 331-356 | BARTLETT | 965H | 2019-10-10 | Yes |
| 331-388 | SUGARGROVE | 965H | 2021-01-25 | Yes |
| 331-399 | DOWNERSGRV | 965H | 2021-01-22 | Yes |
| 331-400 | OSWEGO | 965H | 2019-08-08 | Yes |
| 331-500 | GENEVA | 965H | 2021-01-04 | Yes |
| 331-529 | NAPERVILLE | 965H | 2019-08-08 | Yes |
| 331-600 | WHEATON | 965H | 2019-08-08 | Yes |
| 331-732 | GENEVA | 965H | 2019-10-11 | Yes |
| 331-758 | AURORA | 965H | 2021-10-27 | Yes |
| 331-788 | GENEVA | 965H | 2021-01-25 | Yes |
| 331-867 | YORKVILLE | 965H | 2020-07-14 | Yes |
| 331-899 | LOMBARD | 965H | 2020-12-22 | Yes |
| 331-900 | ELMHURST | 965H | 2019-08-08 | Yes |
| 331-946 | GLEN ELLYN | 965H | 2020-07-14 | 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.