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Kane County State's Attorney's Office

Kane County, Illinois, State's Attorney's Office
Joseph H. McMahon, State's Attorney

​​​Joseph H. McMahonJoe H. McMahon

Kane County State's Attorney 


Joe McMahon was appointed Kane County State’s Attorney in November 2010.

Joe began his legal career in 1992 as an Assistant State’s Attorney in Kane County. He has prosecuted and tried to verdict serious traffic, domestic violence, sexual assault, gang-related crimes, crimes against children and the elderly, and first-degree murder and death-penalty cases. From 1998 to 2000 Joe served as chief of the Criminal Division of the Kane County State’s Attorney’s Office and supervised a staff of 28 lawyers and all criminal prosecutions in Kane County. Joe also worked as an Assistant Attorney General for the state of Illinois prosecuting white collar crime, public corruption and healthcare fraud.

Before he was appointed Kane County State’s Attorney, Joe was in the private practice of law, representing small and mid-sized organizations and their principals as their outside general counsel. 

Joe is a lifelong resident of Kane County, and a graduate of St. Edward High School. He is a graduate of the University of Iowa (BBA, finance), the John Marshall Law School (JD) and the University of Notre Dame (MBA).

Joe is a member of the Illinois State Bar Association, having previously served as chairman of its Corporate Law Department Section Council, chairman of the Sentencing & Corrections Committee and a former member of its Judicial Evaluation Outside of Cook County Committee. Joe is a member of the Kane County Bar Association, served on the board of directors of Fox Valley Volunteer Hospice, the largest all-volunteer hospice organization in the United States, and is the Illinois State Director for the National District Attorneys Association. He was selected by his peers to represent the Second District, encompassing the northern 13 counties and most populous areas outside the city of Chicago, on the Board of Governors for the Office of the Illinois State’s Attorney’s Appellate Prosecutor and is chairman of the Illinois State’s Attorney’s Best Practices Committee.​