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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 1970 | Aberdeen Pheasants | 4.06 | .260 | NORL |
| 1971 | Watertown Bucks | 4.17 | .267 | NORL |
| 1972 | Aberdeen Pheasants | 4.23 | .268 | NORL |
| 1973 | Aberdeen Pheasants | 4.17 | .260 | NORL |
| 1974 | Huron Cubs | 3.70 | .251 | NORL |
| 1975 | St. Cloud Rox | 3.79 | .252 | NORL |
| 1976 | Aberdeen Pheasants | 3.60 | .240 | NORL |
| 1977 | Huron Cubs | 3.98 | .251 | NORL |
| 1978 | Aberdeen Pheasants | 4.09 | .246 | NORL |
| 1979 | Watertown Bucks | 4.15 | .251 | NORL |
| 1980 | St. Cloud Rox | 4.39 | .262 | NORL |
| 1981 | Aberdeen Pheasants | 8.20 | .312 | NORL |
