Illinois
- History
- Abraham Lincoln Presidential Library & Museum
- Abraham Lincoln's Documents in the State Archives
- American Local History Network: Illinois
- At Home in the Heartland
- Aurora Historical Society
- Belleville Illinois: a Pictorial History & Tribute
- Cass County Historical & Genealogical Society
- Catlin Historical Society
- Century of Progress International Exposition 1933-34
- Chicago 1844 City Directory
- Chicago 1855/56 City Directory
- Chicago and the Great Fire of 1871
- Chicago: City of the Century
- Chicago Historical Resource Survey
- Chicago Historical Society
- Chicago Historical Society - History Files
- Chicago Imagebase
- Chicago in 1900
- Chicago Landmarks
- Chicago Metro History Fair
- Collected Works of Abraham Lincoln
- Crawford County Historical Society
- Crystal Lake Historical Society
- Cyndi's List of Genealogy Sites on the Internet: Illinois
- Deaths, Disturbances, Disasters, & Disorders in Chicago
- Digital Past
- Dramas of Haymarket
- Early Illinois Women & Other Unsung Heroes
- Edgewater Historical Society
- Elgin: An American History
- Elgin: Days Gone By
- ElginHistory
- Evanston Historical Society
- Federal Township Plats of Illinois (1804-1891)
- Glencoe Historical & Architectural Survey
- Goin' to Chicago
- Google: Illinois - History
- Graveyards of Chicago
- Great Chicago Fire & the Web of Memory
- Happened This Day in Champaign County
- Harvesting the River
- Haymarket Affair Digital Collection
- Hyde Park Historical Society
- ILGenWeb
- Illini Confederation: Lords of the Mississippi Valley
- Illinois Alive!
- Illinois As It Is (1857)
- Illinois City Directories
- Illinois Civil War Veterans
- Illinois Digital Archives
- Illinois During the Civil War
- 'Illinois' entry from Hodge's Handbook
- Illinois Gallery
- Illinois Heritage Association
- Illinois Historic Preservation Agency
- Illinois Historical Markers
- Illinois History
- Illinois History Pages
- Illinois History Resource Page
- Illinois in the Civil War
- Illinois in the Civil War
- Illinois Labor History Society
- Illinois Maps
- Illinois Public Domain Land Tract Sales Database
- Illinois Regional Archives Depository System
- Illinois State Archives Online Databases
- Illinois State Museum
- Illinois Statewide Marriage Index, 1763–1900
- Illinois Trails: History & Genealogy
- Interactive Guide to World's Columbian Exposition
- Jackson County Illinois Trails & Genealogy
- Lemont Area Historical Society
- Lincoln Memorial (1865)
- Lincoln/Net
- McLean County - Birth Index 1860-1915
- Mount Prospect Historical Society
- Mr. Lincoln's Virtual Library
- MuseumLink Illinois
- Old Chicago in Vintage Postcards
- Papers of Abraham Lincoln
- Peoria 1883/84 City Directory
- Photographs from the Chicago Daily News, 1902-1933
- Ridge Historical Society
- Rogers Park/West Ridge Historical Society
- World's Columbian Exposition of 1893
- WPA Life Histories from Illinois
- Yahoo!: Illinois - History