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30 teams
There are two leagues in major league baseball, the American League and the National League. There are about 19 leagues in minor league baseball that include the Arizona League, Appalachian League, California League, Pacific Coast League, International League, and others.
There are 14 teams in the American League. There are also 16 in the National League.
There were 30 teams in the MLB, 14 in the American League and 16 in the National League.
There were 30 teams in Major League Baseball in 2005.