The Illinois State Association of Counties (ISACo) is a statewide association whose mission is to empower county officials to provide excellent service to their residents. ISACo member counties are comprised of forward-thinking public servants who recognize that the challenges confronting county governments require new and innovative ideas, collaborative solutions and collective advocacy at the state and federal levels of government.

Counties are an essential partner in the federal, state and local governance partnership.  To this end, ISACo represents county government as an institution and does not advocate on behalf of any specific county office.

ISACo provides education and training opportunities, peer-to-peer networking, shared resources and robust representation before policymakers at various levels of government. ISACo creates and connects county officials to these opportunities and successfully equips them to make counties ideal places to live, work and play. 

ISACo is organized exclusively for non-profit purposes and will operate at all times in the manner contemplated by section 501(c)(4) of the Internal Revenue Code or by such other provisions of the Code that will assist ISACo to accomplish its non-profit purposes. ISACo is committed to the highest standard of ethical conduct and transparency in the pursuit of our mission.


ISACo member counties are regionally diverse and home to almost 80% of Illinois' population. Our members are as follows:

ISACo Member Counties 

A map of ISACo member counties is available here. 

ISACo Affiliate Members

Illinois Association of County Auditors

Illinois Association of Court Clerks

Board of Directors

ISACo is governed by an 13-member Board of Directors. The following individuals serve on the Board and provide ISACo staff with guidance and direction towards the fulfillment of the organization's mission:

Matt Prochaska, President
Kendall County Circuit Clerk
Dennis Deer, Vice President
Cook County Commissioner
David Meyer, Secretary
Washington County Board Chairman
William Crowley, Treasurer
Winnebago County Auditor
Alma Anaya
Cook County Commissioner
Jennifer Bertino-Tarrant
Will County Executive
Andrew Erbes
Jackson County Board Member
John Finfrock
Ogle County Board Chairman
Monica Gordon
Cook County Commissioner
Sandy Hart
Lake County Board Chairwoman
Stanley Moore
Cook County Commissioner
Corinne Pierog
Kane County Board Chairwoman
David Zimmerman
Tazewell County Board Chairman


Joe McCoy - Executive Director 


Nekya Hall - Legislative Advocacy and Research Manager 


Tiffani Homer - Member Services and Communications Manager 


Staff can also be contacted at 217-679-3368. We look forward to learning how we can be of service.