We currently have 3 conventional police frequencies for Cook in Cook as well as 0 countywide trunking frequencies and 0 countywide talkgroups in our database. View Cook police frequencies sorted by city.
| Agency | Description | Radio Freq | FCC License |
| Cook County Sheriff | Cook County Sheriff - Alternate | 154.0325 | N/A |
| Cook County Sheriff | Cook County Sheriff - Dispatch | 155.5650 | N/A |
| Cook County Sheriff | Cook County Sheriff - Dispatch | 158.7600 | N/A |
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