Law Enforcement Agencies in Onigum, MN MN › Cass County Agencies serving the city of Onigum in MN. Agency Types in Onigum County Jails 1 agencies Municipal Police 1 agencies Sheriff 1 agencies All Agencies in Onigum, MN Cass County Detention Center Cass County Cass County Sheriffs Office Cass County Walker Police Department Cass County
