If available, see below for a list of known police frequencies for Union County in New Jersey. Or, navigate to your city or town to view your local city and/or police frequencies within Union County, New Jersey.
| Elizabeth | Fanwood | Garwood | Kenilworth | |
| Linden | Mountainside | New Providence | Plainfield | |
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| Rahway | Roselle | Roselle Park | Summit | |
| Westfield | ||||
Detect police activity and stay ticket-free in Union County with these police radar detectors.