1920s baseball seasons
145 team seasons across 10 years.
1929
- Boston Red Sox — 36 players
- Brooklyn Robins — 37 players
- Chicago Cubs — 31 players
- Chicago White Sox — 32 players
- Cincinnati Reds — 31 players
- Cleveland Indians — 29 players
- Detroit Tigers — 35 players
- New York Yankees — 31 players
- Philadelphia Athletics — 32 players
- Philadelphia Phillies — 31 players
- Pittsburgh Pirates — 35 players
- St. Louis Browns — 30 players
- St. Louis Cardinals — 32 players
- Washington Senators — 34 players
1928
- Boston Red Sox — 35 players
- Brooklyn Robins — 30 players
- Chicago Cubs — 28 players
- Chicago White Sox — 34 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 43 players
- Detroit Tigers — 27 players
- New York Yankees — 30 players
- Philadelphia Athletics — 29 players
- Philadelphia Phillies — 35 players
- Pittsburgh Pirates — 35 players
- St. Louis Browns — 31 players
- St. Louis Cardinals — 31 players
- Washington Senators — 33 players
1927
- Boston Red Sox — 37 players
- Brooklyn Robins — 31 players
- Chicago Cubs — 34 players
- Chicago White Sox — 33 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 37 players
- Detroit Tigers — 30 players
- New York Yankees — 25 players
- Philadelphia Athletics — 34 players
- Philadelphia Phillies — 34 players
- Pittsburgh Pirates — 33 players
- St. Louis Browns — 30 players
- St. Louis Cardinals — 34 players
- Washington Senators — 41 players
1926
- Boston Red Sox — 40 players
- Brooklyn Robins — 31 players
- Chicago Cubs — 32 players
- Chicago White Sox — 30 players
- Cincinnati Reds — 33 players
- Cleveland Indians — 28 players
- Detroit Tigers — 30 players
- New York Yankees — 31 players
- Philadelphia Athletics — 31 players
- Philadelphia Phillies — 35 players
- Pittsburgh Pirates — 35 players
- St. Louis Browns — 28 players
- St. Louis Cardinals — 30 players
- Washington Senators — 35 players
1925
- Boston Red Sox — 41 players
- Brooklyn Robins — 35 players
- Chicago Cubs — 40 players
- Chicago White Sox — 34 players
- Cincinnati Reds — 34 players
- Cleveland Indians — 36 players
- Detroit Tigers — 31 players
- New York Yankees — 36 players
- Philadelphia Athletics — 33 players
- Philadelphia Phillies — 35 players
- Pittsburgh Pirates — 28 players
- St. Louis Browns — 29 players
- St. Louis Cardinals — 34 players
- Washington Senators — 39 players
1924
- Boston Red Sox — 33 players
- Brooklyn Robins — 33 players
- Chicago Cubs — 32 players
- Chicago White Sox — 41 players
- Cincinnati Reds — 32 players
- Cleveland Indians — 43 players
- Detroit Tigers — 30 players
- New York Giants — 31 players
- New York Yankees — 31 players
- Philadelphia Athletics — 30 players
- Philadelphia Phillies — 33 players
- Pittsburgh Pirates — 30 players
- St. Louis Browns — 33 players
- St. Louis Cardinals — 41 players
- Washington Senators — 35 players
1923
- Boston Red Sox — 30 players
- Brooklyn Robins — 33 players
- Chicago Cubs — 32 players
- Chicago White Sox — 38 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 35 players
- Detroit Tigers — 30 players
- New York Giants — 34 players
- New York Yankees — 25 players
- Philadelphia Athletics — 33 players
- Philadelphia Phillies — 37 players
- Pittsburgh Pirates — 31 players
- St. Louis Browns — 33 players
- St. Louis Cardinals — 37 players
- Washington Senators — 39 players
1922
- Boston Red Sox — 30 players
- Brooklyn Robins — 31 players
- Chicago Cubs — 36 players
- Chicago White Sox — 35 players
- Cincinnati Reds — 24 players
- Cleveland Indians — 46 players
- Detroit Tigers — 27 players
- New York Giants — 37 players
- New York Yankees — 26 players
- Philadelphia Athletics — 31 players
- Philadelphia Phillies — 28 players
- Pittsburgh Pirates — 34 players
- St. Louis Browns — 26 players
- St. Louis Cardinals — 36 players
- Washington Senators — 32 players
1921
- Boston Red Sox — 27 players
- Brooklyn Robins — 30 players
- Chicago Cubs — 35 players
- Chicago White Sox — 34 players
- Cincinnati Reds — 30 players
- Cleveland Indians — 31 players
- Detroit Tigers — 34 players
- New York Giants — 38 players
- New York Yankees — 27 players
- Philadelphia Athletics — 36 players
- Philadelphia Phillies — 36 players
- Pittsburgh Pirates — 33 players
- St. Louis Browns — 34 players
- St. Louis Cardinals — 36 players
- Washington Senators — 33 players
1920
- Boston Red Sox — 33 players
- Brooklyn Robins — 29 players
- Chicago Cubs — 31 players
- Chicago White Sox — 26 players
- Cincinnati Reds — 26 players
- Cleveland Indians — 29 players
- Detroit Tigers — 38 players
- New York Giants — 38 players
- New York Yankees — 26 players
- Philadelphia Athletics — 38 players
- Philadelphia Phillies — 28 players
- Pittsburgh Pirates — 32 players
- St. Louis Browns — 37 players
- St. Louis Cardinals — 34 players
- Washington Senators — 40 players