GILMAN — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |
| RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | 1 |
| ILLINOIS BELL TEL CO | 9329 | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |
| RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | 1 |
| ILLINOIS BELL TEL CO | 9329 | 1 |