DUBUQUE — IA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9631 | 10 |
| UNITED STATES CELLULAR - IA | 6266 | 7 |
| T-MOBILE USA, INC. | 6529 | 4 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | 4 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 3 |