If available, see below for a list of known police frequencies for Johnson County in Illinois. Or, navigate to your city or town to view your local city and/or police frequencies within Johnson County, Illinois.
| Frequency | Description | Agency | |
|---|---|---|---|
| 151.235 | Johnson County Sheriff - Dispatch | Johnson County Sheriff | |
| 155.535 | Johnson County Sheriff - Dispatch | Johnson County Sheriff | |
| 155.58 | Johnson County Sheriff - TAC | Johnson County Sheriff |
Detect police activity and stay ticket-free in Johnson County with these police radar detectors.