If available, see below for a list of known police frequencies for Monticello, Illinois. Or, navigate to another city or town within Piatt County, to view the local police frequencies.
| Bement | Cerro Gordo | Cisco | De Land | |
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| Hammond | Mansfield | Monticello | ||
Detect police activity and stay ticket-free in Monticello, Illinois with these police radar detectors.