HARMON — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| BRIGHTSPEED OF ILLINOIS, LLC | 1057 | 1 |
| AERO NORTH COMMUNICATIONS, INC. - IL | 443F | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| BRIGHTSPEED OF ILLINOIS, LLC | 1057 | 1 |
| AERO NORTH COMMUNICATIONS, INC. - IL | 443F | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |