There are two rosters for an MLB team, a 25-man roster and a 40-man roster. The main team that plays and goes to games is the 25-man roster. The 40-man roster is made up of the 25-man roster plus additional players that are on a major league contract. They may be minor league players or players on injured reserve. Players on the 40-man roster can be "called up" to play on the 25-man roster. Also, after September 1st, the 40-man roster becomes like the 25-man roster and any of the 40 players can play.
How many MLB teams are there?
There are 30 MLB teams. They are divided up evenly between the American League and National League. The American League has 15 teams and the National League 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 Guardians
Detroit Tigers
Kansas City Royals
Minnesota Twins
West
Houston Astros
Los Angeles Angels
Oakland Athletics
Seattle Mariners
Texas Rangers
Fun Facts about MLB Teams
The Boston Americans beat the Pittsburgh Pirates in the first World Series 5-3.
The New York Yankees have won the most World Series with 27. This is more than twice as many as the next closest team.
The first All-Star game with players from both leagues was in 1933.
The Yankees and Red Sox have been one of the greatest rivalries in all of sports. It all started when the Red Sox sold Babe Ruth to the Yankees. The Red Sox then went from 1918 to 2004 without winning the World Series. This was called the Curse of the Bambino.
In 1989 the World Series between the Oakland A's and the San Francisco Giants had to be delayed after huge earthquake shook the bay area.
A player has pitched a perfect game in baseball when every player that comes up to bat gets out. This is even rarer than a no-hitter, where walks are allowed.
