- America's Historic Places: Illinois
- Information includes general information on historic places in Illinois.
- Canal Corridor Association
- Features historical details about the Illinois and Michigan Canal. Includes boat rides, historic sites and events.
- Illinois Courts
- Features detailed article about the history of the Illinois judicial system, and information on County Courts.
- The Illinois History Resource Page
- Offers large collection of links and articles about Illinois history, symbols, government, geography, and genealogy.
- Illinois State Archives
- Depository of state government records of permanent value. Includes information on genealogy, history, services, and access. Based in Springfield.
- Illinois State Genealogical Society
- Offers information about activities, programs, projects, membership, and conferences.
- Illinois State Historical Society
- Works to promote the study of Illinois history. Information on activities, membership, events, publications, and resources. Located in Springfield.
- The Manteno Project
- Resource of information on Manteno State Hospital in Manteno, Illinois.
- State History Guide: Illinois
- Features chronological history of Illinois from prehistory to present day.
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