We currently have 4 conventional radio frequencies in our database for Grinnell Police. We also have 7 conventional radio frequencies in our database for Poweshiek County, which is where Grinnell is located.
| Agency | Description | Radio Freq | FCC License |
| Grinnell Police | Grinnell Police - Alternate | 154.0850 | N/A |
| Grinnell Police | Grinnell Police - Alternate | 155.5200 | N/A |
| Grinnell Police | Grinnell Police - Alternate | 155.9100 | N/A |
| Grinnell Police | Grinnell Police - Dispatch | 151.1825 | N/A |
| Agency | Description | Radio Freq | FCC License |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 151.1675 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 151.3250 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 172.9250 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 453.5125 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 453.5875 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 453.6875 | N/A |
| Poweshiek County Sheriff | Poweshiek County Sheriff - Dispatch | 453.8125 | N/A |
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