HUMBOLDT — IA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| UNITED STATES CELLULAR - IA | 6266 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | 1 |
| COMMUNICATIONS 1 NETWORK, INC. - IA | 842E | 1 |