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16 prefixes in 779 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 779-220 | CRYSTAL LK | 984E | 2011-05-25 | Yes |
| 779-234 | PLAINFIELD | 984E | — | Yes |
| 779-257 | WILMINGTON | 984E | 2018-07-11 | Yes |
| 779-324 | FRANKFORT | 984E | 2010-08-17 | Yes |
| 779-340 | COAL CITY | 984E | 2021-11-22 | Yes |
| 779-358 | PLAINFIELD | 984E | 2022-10-18 | Yes |
| 779-424 | ROCKFORD | 984E | 2025-06-10 | Yes |
| 779-433 | DIXON | 984E | 2025-09-08 | Yes |
| 779-444 | WONDERLAKE | 984E | 2010-08-17 | Yes |
| 779-529 | MANTENO | 984E | 2010-08-17 | Yes |
| 779-548 | MARENGO | 984E | 2010-08-16 | Yes |
| 779-601 | LA SALLE | 984E | 2014-09-10 | Yes |
| 779-701 | KANKAKEE | 984E | 2015-01-28 | Yes |
| 779-707 | JOLIET | 984E | 2015-04-21 | Yes |
| 779-803 | NEW LENOX | 984E | 2013-08-16 | Yes |
| 779-901 | MARENGO | 984E | 2015-04-30 | 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.