Illinois State Historical Society
- Promoting a deeper understanding of and appreciation for Illinois history.
- http://www.historyillinois.org/

Illinois Central Railroad Historical Society
- Dedicated to the preservation of historical and educational information about the Illinois Central Railroad and the many predecessor railroads that have been part of the Illinois Central System.
- http://www.icrrhistorical.org/

Illinois Heritage Association
- Perpetuating the history and heritage of Illinois by providing professional services to educational institutions, local government bodies and nonprofit agencies.
- http://illinoisheritage.prairienet.org/

Society Hill: Illinois Societies
- Directory of Illinois historical societies. Includes contact information and links.
- http://www.daddezio.com/society/hill/SH-IL-NDX.html

Chicago Historical Society
- Devoted to collecting, interpreting, and presenting the rich multicultural history of Chicago and Illinois.
- http://www.chicagohs.org/