| Year | Club | W | L | PCT | GB | Manager | ||
|---|---|---|---|---|---|---|---|---|
| 1968 | Clinton | 54 | 67 | .446 | 17 | Bob Clear | Stats | |
| 1967 | Clinton | 51 | 69 | .425 | 21.5 | Bob Clear | Stats | |
| 1966 | Clinton | 48 | 76 | .387 | 34.5 | Frank Oceak | Stats | |
| 1962 | Burlington | 44 | 79 | .358 | 29 | James Adlam | Stats | |
| 1960 | Dubuque | 66 | 56 | .541 | 14 | James Adlam | Stats | |
| 1959 | Dubuque | 56 | 68 | .452 | 20 | Wally Millies/ Syd Thrift/ Albert Kubski/ John Armstrong | Stats | |
| 1958 | Clinton | 44 | 80 | .355 | 26.5 | Stan Wentzel/ Wally Millies | Stats | |
| 1957 | Clinton | 56 | 68 | .452 | 19.5 | Stan Wentzel | Stats | |
| 1956 | Clinton | 63 | 60 | .512 | 9 | Stan Wentzel | Stats | |
| 1955 | Clinton | 68 | 57 | .544 | 5.5 | Robert Clark | Stats | |
| 1954 | Clinton | 63 | 59 | .516 | 9 | Robert Clark | Stats | |
| 1949 | Mount Vernon | 53 | 67 | .442 | 22 | Bill Trotter/ Robert Shreve | Stats |
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