Portal:Illinois
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Works related to Illinois, a state of the United States.

Works
- The History of McLean County, Illinois (1879)
- The Story of Illinois (1925) by Theodore Calvin Pease (transcription project)
Newspaper articles
- Illinois State Register editorial on the Dred Scott case (1857)
- Illinois State Register editorial on the Harper's Ferry (1857)
Encyclopedias
- "Illinois," by Eaton S. Drone in The American Cyclopædia (1879)
- "Christian (counties)," in The American Cyclopædia (1879)
- "Peoria (county)," in The American Cyclopædia (1879)
- "Illinois," by J. W. Sheahan and Joseph Medill in Encyclopædia Britannica, Ninth Edition (v. 12) (1881)
- "Illinois (State)," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Chicago Drainage Canal," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Chicago River," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Illinois College," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Northwestern University," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Illinois," in The Nuttall Encyclopædia, (ed.) by James Wood, London: Frederick Warne and Co., Ltd. (1907)
- "Illinois," in Encyclopædia Britannica (11th ed., 1911)
- "Illinois," by Hugh O'Neill in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
- "Illinois," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)
- "Northwestern University," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)
- "Illinois (State)," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Chicago Drainage Canal," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Chicago River," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Illinois College," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Illinois," by Theodore Calvin Pease in Encyclopædia Britannica (12th ed., 1922)
Law
- Road and Bridge Laws of Illinois (1917)
- Illinois Constitution of 1970
- Illinois Compiled Statutes/Respiratory Care Practice Act