If available, see below for a list of known police frequencies for Johnston, Iowa. Or, navigate to another city or town within Polk County, to view the local police frequencies.
| Alleman | Altoona | Ankeny | Bondurant | |
| Clive | Des Moines | Elkhart | Grimes | |
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| Johnston | Mitchellville | Pleasant Hill | Polk City | |
| Runnells | Urbandale | West Des Moines | Windsor Heights | |
Detect police activity and stay ticket-free in Johnston, Iowa with these police radar detectors.