League Index
 
Bold indicates World Championship Champion
 
Lg LgAvg LgERA Champion Year Champion LgERA LgAvg Lg
KL .245 3.64 Newark Gunners 1921 Washington Grays 3.73 .244 ML
KL .239 3.66 Bangor Lumberjacks 1922 Rockville Superbas 4.03 .253 ML
KL .240 3.61 Providence Steamrollers 1923 Washington Grays 4.01 .256 ML
KL .244 3.80 Bangor Lumberjacks 1924 Pittsburgh Moon Dogs 4.35 .265 ML
KL .244 3.65 Providence Steamrollers 1925 Washington Grays 4.38 .267 ML
KL .251 4.06 Providence Steamrollers 1926 Washington Grays 3.86 .256 ML
KL .249 3.99 Boston Patriots 1927 Rockville Superbas 3.80 .254 ML
KL .249 3.87 Brooklyn Bums 1928 Philadelphia Haymakers 3.97 .253 ML
KL .242 3.83 Brooklyn Bums 1929 Portsmouth Spartans 4.10 .252 ML
KL .231 3.66 Brooklyn Bums 1930 Pittsburgh Keystones 3.82 .242 ML
KL .236 3.75 Newark Gunners 1931 Portsmouth Spartans 3.77 .246 ML
KL .249 3.95 Newark Gunners 1932 Washington Grays 3.79 .249 ML
KL .247 3.75 Boston Patriots 1933 Baltimore Blue Hens 3.61 .237 ML
KL .255 3.96 Boston Patriots 1934 Baltimore Blue Hens 3.70 .250 ML
KL .254 4.04 Newark Gunners 1935 Baltimore Blue Hens 3.54 .241 ML
KL .257 4.10 Bangor Lumberjacks 1936 Pittsburgh Keystones 3.71 .246 ML
KL .254 4.09 Poughkeepsie Sheriffs 1937 Pittsburgh Keystones 3.88 .248 ML
KL .245 3.97 Bangor Lumberjacks 1938 Baltimore Blue Hens 3.49 .244 ML
KL .250 4.15 Newark Gunners 1939 Baltimore Blue Hens 3.77 .253 ML
KL .238 3.87 Bangor Lumberjacks 1940 Rockville Superbas 3.95 .259 ML