The IBL was founded in 1919 with just four teams—Galt, Guelph, Stratford and Kitchener—and is believed to be the oldest amateur men's league in Canada and also one of the best, regarding quality of play. During the early years, the league expanded to include the cities of London, Brantford, Preston and St. Thomas, Ontario.

The league's first commissioner in the 1950s was John Gillies, a London, Ontario, lawyer and former pitcher in the league for the London Majors.

It was previously known as the Intercounty Major Baseball League and the Senior Intercounty Baseball League. The teams play for the Jack and Lynne Dominico Trophy, which is awarded to the league champions. Jack and (and the late Lynne) Dominico own the Toronto Maple Leafs Baseball Club.

The is the only Amateur that I will cover

1919     Galt, Guelph, Stratford and Kitchener

1920 to 1952     Unknown Teams

1954    Brantford, Galt, Guelph-Waterloo, Kitchener, London, St Thomas

1955 to 2000      unknown

2001    Barrie, Brantofrd, Guelph, Hamilton, Kitchener, London, St Thomas, Toronto, Waterloo

2002    Oshawa enter the league

2003    Stratford enter the league and St Thomas and Waterloo has left the league

2005 to 2008  No Teams enter or left the league

2009    Mississauga enter the league an Stratford has left the league

2010    Ottawa enter the league and Oshawa has left the league.

2011     Burlington enter the league and Guelph and Mississauga left the league

2012    Guelph enter the league.

2013    Ottawa has left the league.

2014     No Teams enter or left the league

2015     No Teams enter or left the league

2016     No Teams enter or left the league

2017     No Teams enter or left the league

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