Law Enforcement Agencies in Belleville, IL IL › St. Clair County Agencies serving the city of Belleville in IL. Agency Types in Belleville Campus Police 1 agencies Coroners 1 agencies County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Belleville, IL Belleville Police Department St. Clair County Southwestern Illinois College St. Clair County St Clair County Coroners Office St. Clair County St Clair County Jail St. Clair County St Clair County Sheriffs Department St. Clair County
