ALTON — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 9 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 4 |
| PAETEC ITEL, LLC | 829J | 2 |
| NUSO, LLC | 478J | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 9 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 4 |
| PAETEC ITEL, LLC | 829J | 2 |
| NUSO, LLC | 478J | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |