Law Enforcement Agencies in Monticello, IL IL › Piatt County Agencies serving the city of Monticello in IL. Agency Types in Monticello Coroners 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Monticello, IL Monticello Police Department Piatt County Piatt County Coroners Office Piatt County Piatt County Jail Piatt County Piatt County Sheriffs Office Piatt County
