The Illinois–Missouri League was an American minor league baseball league. It began operations in 1908, and continued through 1914.
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1908
The league was formed. Newly formed teams in Canton, Illinois, Galesburg, Illinois, Hannibal, Missouri, Havana, Illinois, Macomb, Illinois, and Monmouth, Illinois joined the league.
1909
Hannibal left the league to join the American Association. The team in Havana folded. Newly formed teams in Beardstown, Illinois and Pekin, Illinois joined the league.
1910
The teams from Galesburg and Monmouth joined the Central Association. New teams in Clinton, Illinois and Lincoln, Illinois joined the league. Beardstown moved to Jacksonville, Illinois on July 21, and folded with Macomb on August 17.
1911
New teams in Champaign-Urbana and Taylorville, Illinois joined the league.
1912
Taylorville folded. A new team in Streator, Illinois formed and joined the league. The Champaign-Urbana Velvets changed their name to the Champaign Velvets. The team from Clinton moved to Kankakee, Illinois on May 16. Its record prior to the move was 2-5; thereafter, they went 54-51.
1913
Canton and Pekin folded on July 10, before the end of the season. The league also instituted a playoff system in which the best record of the first half of the season would play the best record of the second half of the season.
As Lincoln won the first half outright and tied for the second, it seems to have been judged to be the winner.
1914
New teams in LaSalle, Illinois and Ottawa, Illinois formed and joined the league. Kankakee and Lincoln both folded on July 3, before the season ended.
Ottawa and Streator left the league to join the Bi-State League. The teams in Champaign and LaSalle folded, and the league itself folded.