At the start of the 2012 MLB Season there are 30 teams, 16 in the national league and 14 in the american league.
Starting 2013, both leagues will have 15 teams each with the Houston Astros being moved to the American League West division as required by Bud Selig.
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There are a total of 30 teams in Major League Baseball. 14 play in the American League (AL) while 16 are in the National League (NL)
There were 30 teams in Major League Baseball in 2005.
There is one Major League Baseball team, the Miami Marlins.
Angels, A's, Indians, Orioles,
Beginning with the 2013 Major League Baseball season, there will be 15 teams in the National League and 15 in the American League. A longtime imbalance between the two leagues is being solved by the transfer of the Houston Astros from the N.L. Central to the A.L. West.
There are 14 teams in the American League. There are also 16 in the National League.