Law Enforcement Agencies in Marion, IL IL › Williamson County Agencies serving the city of Marion in IL. Agency Types in Marion Adult Institutions 1 agencies Coroners 1 agencies County Jails 1 agencies Federal Corrections 1 agencies Municipal Police 1 agencies Parole Probation 1 agencies Sheriff 1 agencies All Agencies in Marion, IL Department of Corrections Williamson County Marion Parole Office Williamson County Marion Police Department Williamson County Marion USP Williamson County Williamson County Coroners Office Williamson County Williamson County Jail Williamson County Williamson County Sheriffs Department Williamson County
