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Kane County State's Attorney's Office Joseph H. McMahon - State's Attorney; State's Attorney's Office - Kane County Kane County State's Attorney's Office
37W777 Route 38, Suite 300
St. Charles, IL 60175
(630) 232-3500

​​​Joseph H. McMahonJoe H. McMahon

Kane County State's Attorney 


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

Joe is a lifelong resident of Kane County, and a 1984 graduate of St. Edward High School. Joe earned his bachelor's degree in 1988 from the University of Iowa and his juris doctor from the John Marshall Law School in 1992. In 2006 Joe earned his Master's in Business Administration from the University of Notre Dame. 

Joe began his legal career in 1992 as an Assistant State's Attorney in Kane County prosecuting criminal cases, including traffic, misdemeanor, felonies, 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 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 currently is a member of its Judicial Evaluation Outside of Cook County Committee. Joe is a member of the Kane County Bar Association, and served on the board of directors of Fox Valley Volunteer Hospice, the largest all-volunteer hospice organization in the United States.