LOMBARD — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 17 |
| T-MOBILE USA, INC. | 6529 | 6 |
| ONVOY, LLC | 224C | 5 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 5 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 4 |