1910s baseball seasons
146 team seasons across 10 years.
1919
- Boston Red Sox — 30 players
- Brooklyn Robins — 28 players
- Chicago Cubs — 29 players
- Chicago White Sox — 31 players
- Cincinnati Reds — 27 players
- Cleveland Indians — 28 players
- Detroit Tigers — 24 players
- New York Giants — 41 players
- New York Yankees — 30 players
- Philadelphia Athletics — 49 players
- Philadelphia Phillies — 38 players
- Pittsburgh Pirates — 30 players
- St. Louis Browns — 32 players
- St. Louis Cardinals — 37 players
- Washington Senators — 40 players
1918
- Boston Red Sox — 32 players
- Brooklyn Robins — 35 players
- Chicago Cubs — 29 players
- Chicago White Sox — 31 players
- Cincinnati Reds — 26 players
- Cleveland Indians — 32 players
- Detroit Tigers — 34 players
- New York Giants — 32 players
- New York Yankees — 36 players
- Philadelphia Athletics — 28 players
- Philadelphia Phillies — 27 players
- Pittsburgh Pirates — 33 players
- St. Louis Browns — 26 players
- St. Louis Cardinals — 36 players
- Washington Senators — 30 players
1917
- Boston Red Sox — 27 players
- Brooklyn Robins — 31 players
- Chicago Cubs — 37 players
- Chicago White Sox — 25 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 30 players
- Detroit Tigers — 27 players
- New York Giants — 33 players
- New York Yankees — 37 players
- Philadelphia Athletics — 41 players
- Philadelphia Phillies — 24 players
- Pittsburgh Pirates — 41 players
- St. Louis Browns — 40 players
- St. Louis Cardinals — 33 players
- Washington Senators — 25 players
1916
- Boston Red Sox — 29 players
- Brooklyn Robins — 32 players
- Chicago Cubs — 45 players
- Chicago White Sox — 27 players
- Cincinnati Reds — 33 players
- Cleveland Indians — 44 players
- Detroit Tigers — 34 players
- New York Giants — 37 players
- New York Yankees — 35 players
- Philadelphia Athletics — 50 players
- Philadelphia Phillies — 29 players
- Pittsburgh Pirates — 45 players
- St. Louis Browns — 32 players
- St. Louis Cardinals — 30 players
- Washington Senators — 31 players
1915
- Boston Red Sox — 30 players
- Brooklyn Robins — 33 players
- Chicago Cubs — 33 players
- Chicago White Sox — 32 players
- Cincinnati Reds — 29 players
- Cleveland Indians — 38 players
- Detroit Tigers — 27 players
- New York Giants — 36 players
- New York Yankees — 40 players
- Philadelphia Athletics — 56 players
- Philadelphia Phillies — 23 players
- Pittsburgh Pirates — 34 players
- St. Louis Browns — 46 players
- St. Louis Cardinals — 28 players
- Washington Senators — 34 players
1914
- Boston Red Sox — 32 players
- Brooklyn Robins — 28 players
- Chicago Cubs — 36 players
- Chicago White Sox — 33 players
- Cincinnati Reds — 42 players
- Cleveland Naps — 46 players
- Detroit Tigers — 30 players
- New York Giants — 33 players
- New York Yankees — 35 players
- Philadelphia Athletics — 39 players
- Philadelphia Phillies — 30 players
- Pittsburgh Pirates — 41 players
- St. Louis Browns — 38 players
- St. Louis Cardinals — 31 players
- Washington Senators — 33 players
1913
- Boston Red Sox — 29 players
- Chicago Cubs — 39 players
- Chicago White Sox — 38 players
- Cincinnati Reds — 45 players
- Cleveland Naps — 35 players
- Detroit Tigers — 43 players
- New York Giants — 32 players
- New York Yankees — 44 players
- Philadelphia Athletics — 36 players
- Philadelphia Phillies — 36 players
- Pittsburgh Pirates — 37 players
- St. Louis Browns — 41 players
- St. Louis Cardinals — 40 players
- Washington Senators — 38 players
1912
- Boston Red Sox — 27 players
- Chicago Cubs — 40 players
- Chicago White Sox — 41 players
- Cincinnati Reds — 41 players
- Cleveland Naps — 47 players
- Detroit Tigers — 52 players
- New York Giants — 28 players
- New York Highlanders — 44 players
- Philadelphia Athletics — 35 players
- Philadelphia Phillies — 39 players
- Pittsburgh Pirates — 38 players
- St. Louis Browns — 45 players
- St. Louis Cardinals — 41 players
- Washington Senators — 41 players
1911
- Boston Red Sox — 43 players
- Chicago Cubs — 35 players
- Chicago White Sox — 34 players
- Cincinnati Reds — 32 players
- Cleveland Naps — 40 players
- Detroit Tigers — 29 players
- New York Giants — 28 players
- New York Highlanders — 35 players
- Philadelphia Athletics — 30 players
- Philadelphia Phillies — 39 players
- Pittsburgh Pirates — 33 players
- St. Louis Browns — 46 players
- St. Louis Cardinals — 38 players
- Washington Senators — 28 players
1910
- Boston Red Sox — 35 players
- Chicago Cubs — 27 players
- Chicago White Sox — 34 players
- Cincinnati Reds — 38 players
- Cleveland Naps — 44 players
- Detroit Tigers — 29 players
- New York Giants — 28 players
- New York Highlanders — 30 players
- Philadelphia Athletics — 27 players
- Philadelphia Phillies — 33 players
- Pittsburgh Pirates — 33 players
- St. Louis Browns — 42 players
- St. Louis Cardinals — 36 players
- Washington Senators — 30 players