Official MLB logo

Major League Baseball (MLB) is the highest level of professional baseball in the world. It was formed by two leagues in 2000, although it can trace its own lineage back to 1869 since the "Major League Baseball" trademark was in use prior to the merging of the National League and American League. The league currently consists of 30 teams from the United States and Canada.

The regular season runs from the beginning of April to the end of September during which each team plays 162 games. The pre-season (known as "Spring training") starts in mid-February. At the end of each regular season, 16 teams play in the World Series play-offs. Since 2003, the winning side of the All-Star Game earns home-field advantage in the World Series.

American League:Edit

  • Baltimore Orioles (east), formerly St. Louis Browns but originally Milwaukee Brewers
  • Boston Red Sox (east)
  • New York Yankees (east)
  • Tampa Bay Rays (east), formerly Tampa Bay Devil Rays
  • Toronto Blue Jays (east)
  • Chicago White Sox (central), originally Chicago White Stockings
  • Cleveland Indians (central), formerly Cleveland Blues/Bronchos/Naps
  • Detroit Tigers (central)
  • Kansas City Royals (central)
  • Minnesota Twins (central), originally 1901 Washington Senators
  • Los Angeles Angels of Anaheim (west), formerly California Angels, then Anaheim Angels but originally Los Angeles Angels
  • Oakland Athletics (west), formerly Kansas City Athletics but originally Philadelphia Athletics
  • Seattle Mariners (west)
  • Texas Rangers (west), originally 1961 Washington Senators

National League:Edit

  • Atlanta Braves (east), formerly Milwaukee Braves but originally Boston Red Stockings
  • Miami Marlins (east), originally Florida Marlins
  • New York Mets (east)
  • Philadelphia Phillies (east)
  • Washington Nationals (east), formerly Montreal Expos
  • Chicago Cubs (central), originally Chicago White Stockings
  • Cincinnati Reds (central), originally Cincinnati Red Stockings
  • Houston Astros (central), originally Houston Colt 45's
  • Milwaukee Brewers (central), originally Seattle Pilots
  • Pittsburgh Pirates (central)
  • St. Louis Cardinals (central), originally St. Louis Brown Stockings
  • Arizona Diamondbacks (west)
  • Colorado Rockies (west)
  • Los Angeles Dodgers (west), originally Brooklyn Atlantics/Grays/Bridegrooms/Superbas/Robins/Dodgers
  • San Diego Padres (west)
  • San Francisco Giants (west), formerly New York Giants but originally New York Gothams

Franchise histories were provided by Bukisa, please visit for more details on failed baseball franchises in North America.

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