GRINNELL — IA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | 3 |
| UNITED STATES CELLULAR - IA | 6266 | 2 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | 2 |
| METROPCS, INC. | 5562 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |