NAPERVILLE — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 34 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 17 |
| T-MOBILE USA, INC. | 6529 | 14 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 12 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 6 |