They use Union County Sheriff
453.850 Mhz. PL 114.8 Hz (Dispatch)
453.2875 Mhz. PL:114.8 Hz (Countywide Law)
You can also catch them on the Char/Meck Union County portion of the 800 Mhz p-25 system as well.
45596 Union County Sheriff Disp.
45500 Countywide Law Ops.
All of the small towns use the Union County Sheriff Channel
This includes to Towns of:
Marshville
Wingate
Stallings
Waxhaw
The Towns of Indian Trail, Lake Park and Mineral Springs are patrolled by the Union County Sheriff's Office.
Monroe Police is now strictly on 800 Mhz.
45597 Monroe Police Disp.
45574 Monroe Police Tac
Hope This helps
David