T-MOBILE USA, INC.
40 prefixes in 815 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 815-212 | JOLIET | 6529 | — | Yes |
| 815-260 | JOLIET | 6529 | — | Yes |
| 815-295 | KANKAKEE | 6529 | — | Yes |
| 815-302 | JOLIET | 6529 | — | Yes |
| 815-378 | ROCKFORD | 6529 | — | Yes |
| 815-405 | JOLIET | 6529 | — | Yes |
| 815-482 | WOODSTOCK | 6529 | — | Yes |
| 815-483 | JOLIET | 6529 | — | Yes |
| 815-505 | ROCKFORD | 6529 | — | — |
| 815-509 | ROCKFORD | 6529 | — | Yes |
| 815-514 | JOLIET | 6529 | 2001-01-24 | Yes |
| 815-516 | ROCKFORD | 6529 | 2001-01-24 | Yes |
| 815-519 | ROCKFORD | 6529 | — | Yes |
| 815-530 | JOLIET | 6529 | — | Yes |
| 815-540 | ROCKFORD | 6529 | — | Yes |
| 815-549 | KANKAKEE | 6529 | — | Yes |
| 815-582 | JOLIET | 6529 | 2005-10-06 | Yes |
| 815-590 | STERLING | 6529 | 2003-07-14 | Yes |
| 815-593 | DE KALB | 6529 | — | Yes |
| 815-603 | JOLIET | 6529 | 2001-09-28 | — |
| 815-608 | ROCKFORD | 6529 | 2002-09-30 | Yes |
| 815-616 | FREEPORT | 6529 | 2004-01-07 | Yes |
| 815-621 | ROCKFORD | 6529 | — | Yes |
| 815-630 | JOLIET | 6529 | 2006-07-24 | Yes |
| 815-670 | ROCKFORD | 6529 | — | Yes |
| 815-690 | JOLIET | 6529 | — | Yes |
| 815-693 | JOLIET | 6529 | — | Yes |
| 815-703 | ROCKFORD | 6529 | 2002-06-04 | Yes |
| 815-712 | LA SALLE | 6529 | 2002-07-05 | Yes |
| 815-779 | PLAINFIELD | 6529 | 2024-02-08 | Yes |
| 815-790 | WOODSTOCK | 6529 | — | Yes |
| 815-791 | JOLIET | 6529 | 2001-07-24 | Yes |
| 815-793 | DE KALB | 6529 | 2001-06-25 | Yes |
| 815-814 | WOODSTOCK | 6529 | 2001-04-27 | — |
| 815-823 | JOLIET | 6529 | — | Yes |
| 815-867 | PONTIAC | 6529 | 2001-04-27 | Yes |
| 815-909 | DE KALB | 6529 | 2001-05-22 | Yes |
| 815-919 | JOLIET | 6529 | 2001-02-23 | — |
| 815-992 | STREATOR | 6529 | 2005-04-21 | Yes |
| 815-999 | JOLIET | 6529 | 2003-07-14 | 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.