FAIRFIELD — IA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | 4 |
| ONVOY, LLC - IA | 221F | 1 |
| LOCAL TELEPHONE DATA SERVICES CORP. | 2842 | 1 |
| UNITED STATES CELLULAR - IA | 6266 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |