Download Police Scanner App and be the first to know about public safety, breaking news, fire alarms, and crime waves near you. 2400: Dispatch. (adsbygoogle = window.adsbygoogle || []).push({}); If available, see below for a list of known police frequencies for Union Parish County in Louisiana. Should an emergency arise, an on call Sheriffs Officer will respond to the last known location of the individual. Ambulance 5-2. Sierra units are single man cars regardless of shift. Radio ID's in the 3000's are officer portables corresponding to their badge number. If it is not listed here We do not have it.