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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 1921 | San Francisco Seals | 3.85 | .288 | PCL |
| 1922 | Portland Beavers | 3.59 | .278 | PCL |
| 1923 | Los Angeles Angels | 3.57 | .276 | PCL |
| 1924 | Los Angeles Angels | 4.06 | .281 | PCL |
| 1925 | Portland Beavers | 4.77 | .299 | PCL |
| 1926 | Oakland Oaks | 4.62 | .290 | PCL |
| 1927 | Sacramento Solons | 4.32 | .289 | PCL |
| 1928 | Los Angeles Angels | 4.02 | .279 | PCL |
| 1929 | Oakland Oaks | 4.58 | .291 | PCL |
| 1930 | Portland Beavers | 4.71 | .292 | PCL |
| 1931 | Sacramento Solons | 3.90 | .276 | PCL |
| 1932 | Sacramento Solons | 4.58 | .285 | PCL |
| 1933 | Los Angeles Angels | 3.90 | .275 | PCL |
| 1934 | Sacramento Solons | 4.26 | .279 | PCL |
| 1935 | Seattle Rainiers | 4.39 | .282 | PCL |
| 1936 | San Francisco Seals | 4.56 | .286 | PCL |
| 1937 | Los Angeles Angels | 4.55 | .282 | PCL |
| 1938 | Sacramento Solons | 4.09 | .282 | PCL |
| 1939 | Los Angeles Angels | 4.07 | .285 | PCL |
| 1940 | Los Angeles Angels | 3.75 | .271 | PCL |
| 1941 | 4.01 | .279 | PCL |
