Illinois during the Civil War
- Although no battles took place in Illinois, the state's residents still shaped the Civil War's course and felt its effects. Includes letters, diaries, and reminiscences of Union soldiers, as well as other materials from the home front.
- http://dig.lib.niu.edu/civilwar/

Illinois in the Civil War
- Contains information about the infantry, cavalry and artillery units.
- http://www.illinoiscivilwar.org/

Illinois Civil War Veterans Database
- Searchable database of the 1900-1901 publication "Report of the Adjutant General of the State of Illinois." Provides company, unit and residence.
- http://www.sos.state.il.us/departments/archives/datcivil.html

Famous Illinoisians with Civil War Ties
- Biographical details, some with images and photos, and access to resources relating to each individual who fought in the war.
- http://www.outfitters.com/illinois/history/civil/heroes.html