FAIRFIELD — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER NORTH, INC. - IL | 1015 | 2 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER NORTH, INC. - IL | 1015 | 2 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |