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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 1970 | Danville Veterans | 3.98 | .256 | MIDW |
| 1971 | Cedar Rapids Cardinals | 4.24 | .257 | MIDW |
| 1972 | Danville Veterans | 4.00 | .253 | MIDW |
| 1973 | Danville Veterans | 4.00 | .252 | MIDW |
| 1974 | Burlington Bees | 3.67 | .244 | MIDW |
| 1975 | Wisconsin Rapids Timber Rattlers | 3.60 | .235 | MIDW |
| 1976 | Danville Veterans | 3.75 | .237 | MIDW |
| 1977 | Wausau Timbers | 4.11 | .248 | MIDW |
| 1978 | Wausau Timbers | 4.04 | .246 | MIDW |
| 1979 | Wisconsin Rapids Timber Rattlers | 4.58 | .258 | MIDW |
| 1980 | Wisconsin Rapids Timber Rattlers | 4.28 | .252 | MIDW |
| 1981 | Wisconsin Rapids Timber Rattlers | 4.36 | .253 | MIDW |
