1930s baseball seasons
132 team seasons across 10 years.
1939
- Boston Red Sox — 29 players
- Chicago Cubs — 28 players
- Chicago White Sox — 33 players
- Cincinnati Reds — 38 players
- Cleveland Indians — 32 players
- Detroit Tigers — 39 players
- New York Yankees — 27 players
- Philadelphia Athletics — 39 players
- Philadelphia Phillies — 46 players
- Pittsburgh Pirates — 36 players
- St. Louis Browns — 45 players
- St. Louis Cardinals — 35 players
- Washington Senators — 40 players
1938
- Boston Red Sox — 30 players
- Chicago Cubs — 29 players
- Chicago White Sox — 36 players
- Cincinnati Reds — 34 players
- Cleveland Indians — 33 players
- Detroit Tigers — 31 players
- New York Yankees — 28 players
- Philadelphia Athletics — 35 players
- Philadelphia Phillies — 38 players
- Pittsburgh Pirates — 25 players
- St. Louis Browns — 36 players
- St. Louis Cardinals — 35 players
- Washington Senators — 28 players
1937
- Boston Red Sox — 30 players
- Chicago Cubs — 27 players
- Chicago White Sox — 28 players
- Cincinnati Reds — 43 players
- Cleveland Indians — 29 players
- Detroit Tigers — 31 players
- New York Yankees — 28 players
- Philadelphia Athletics — 33 players
- Philadelphia Phillies — 32 players
- Pittsburgh Pirates — 26 players
- St. Louis Browns — 40 players
- St. Louis Cardinals — 33 players
- Washington Senators — 41 players
1936
- Boston Red Sox — 31 players
- Chicago Cubs — 26 players
- Chicago White Sox — 30 players
- Cincinnati Reds — 33 players
- Cleveland Indians — 30 players
- Detroit Tigers — 29 players
- New York Yankees — 28 players
- Philadelphia Athletics — 39 players
- Philadelphia Phillies — 38 players
- Pittsburgh Pirates — 26 players
- St. Louis Browns — 28 players
- St. Louis Cardinals — 38 players
- Washington Senators — 35 players
1935
- Boston Red Sox — 33 players
- Chicago Cubs — 27 players
- Chicago White Sox — 32 players
- Cincinnati Reds — 33 players
- Cleveland Indians — 29 players
- Detroit Tigers — 27 players
- New York Yankees — 27 players
- Philadelphia Athletics — 39 players
- Philadelphia Phillies — 32 players
- Pittsburgh Pirates — 29 players
- St. Louis Browns — 34 players
- St. Louis Cardinals — 36 players
- Washington Senators — 38 players
1934
- Boston Red Sox — 34 players
- Chicago Cubs — 29 players
- Chicago White Sox — 38 players
- Cincinnati Reds — 41 players
- Cleveland Indians — 33 players
- Detroit Tigers — 29 players
- New York Yankees — 31 players
- Philadelphia Athletics — 30 players
- Philadelphia Phillies — 38 players
- Pittsburgh Pirates — 30 players
- St. Louis Browns — 28 players
- St. Louis Cardinals — 31 players
- Washington Senators — 39 players
1933
- Boston Red Sox — 36 players
- Chicago Cubs — 29 players
- Chicago White Sox — 33 players
- Cincinnati Reds — 28 players
- Cleveland Indians — 27 players
- Detroit Tigers — 31 players
- New York Yankees — 29 players
- Philadelphia Athletics — 31 players
- Philadelphia Phillies — 34 players
- Pittsburgh Pirates — 28 players
- St. Louis Browns — 27 players
- St. Louis Cardinals — 34 players
- Washington Senators — 30 players
1932
- Boston Red Sox — 42 players
- Chicago Cubs — 31 players
- Chicago White Sox — 50 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 29 players
- Detroit Tigers — 28 players
- New York Yankees — 32 players
- Philadelphia Athletics — 30 players
- Philadelphia Phillies — 33 players
- Pittsburgh Pirates — 27 players
- St. Louis Browns — 29 players
- St. Louis Cardinals — 42 players
- Washington Senators — 30 players
1931
- Boston Red Sox — 37 players
- Brooklyn Robins — 35 players
- Chicago Cubs — 30 players
- Chicago White Sox — 32 players
- Cincinnati Reds — 32 players
- Cleveland Indians — 35 players
- Detroit Tigers — 33 players
- New York Yankees — 28 players
- Philadelphia Athletics — 27 players
- Philadelphia Phillies — 33 players
- Pittsburgh Pirates — 32 players
- St. Louis Browns — 31 players
- St. Louis Cardinals — 31 players
- Washington Senators — 30 players
1930
- Boston Red Sox — 35 players
- Brooklyn Robins — 30 players
- Chicago Cubs — 29 players
- Chicago White Sox — 40 players
- Cincinnati Reds — 33 players
- Cleveland Indians — 34 players
- Detroit Tigers — 36 players
- New York Yankees — 36 players
- Philadelphia Athletics — 30 players
- Philadelphia Phillies — 30 players
- Pittsburgh Pirates — 34 players
- St. Louis Browns — 31 players
- St. Louis Cardinals — 33 players
- Washington Senators — 36 players