If available, see below for a list of known police frequencies for Greencastle, Missouri. Or, navigate to another city or town within Sullivan County, to view the local police frequencies.
| Browning | Green City | Greencastle | Harris | |
| Humphreys | Milan | Newtown | Osgood | |
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| Owasco | Pollock | Reger | ||
Detect police activity and stay ticket-free in Greencastle, Missouri with these police radar detectors.