Major League Baseball the professional organization for American baseball is the oldest among the major sports leagues in the US. They are divided up between the American League and National League. The American League has 15 teams, and the National League also has 15 teams. Each of the leagues is divided into three divisions called the East, the Central, and the West. National League – East: Atlanta Braves, Miami Marlins, New York Mets, Philadelphia Phillies, Washington Nationals. Central: Chicago Cubs, Cincinnati Reds, Milwaukee Brewers, Pittsburgh Pirates, St. Louis Cardinals. West: Arizona Diamondbacks, Colorado Rockies, Los Angeles Dodgers, San Diego Padres San Francisco Giants. American League – East: Baltimore Orioles, Boston Red Sox, New York Yankees, Tampa Bay Rays, Toronto Blue Jays. Central: Chicago White Sox, Cleveland Indians, Detroit Tigers, Kansas City Royals, Minnesota Twins. West: Houston Astros, Los Angeles Angels, Oakland Athletics, Seattle Mariners, Texas Rangers.