| Past champions | |||
| Year | Winner | Score | Course |
| 1999 | Mi Hyun Kim | 204 (12-under) | The Rail GC, Springfield, Ill. |
| 1998 | Pearl Sinn | 200 (16-under) | The Rail GC, Springfield, Ill. |
| 1997 | Cindy Figg-Currier | 200 (16-under) | The Rail GC, Springfield, Ill. |
| 1996 | x-Michelle McGann | 202 (14-under) | The Rail GC, Springfield, Ill. |
| 1995 | x-Mary Beth Zimmerman | 206 (10-under) | The Rail GC, Springfield, Ill. |
| 1994 | Barb Mucha | 203 (13-under) | The Rail GC, Springfield, Ill. |
| 1993 | x-Helen Dobson | 203 (13-under) | The Rail GC, Springfield, Ill. |
| 1992 | x-Nancy Lopez | 199 (17-under) | The Rail GC, Springfield, Ill. |
| 1991 | Pat Bradley | 197 (19-under) | The Rail GC, Springfield, Ill. |
| 1990 | Beth Daniel | 203 (13-under) | The Rail GC, Springfield, Ill. |
| 1989 | Beth Daniel | 203 (13-under) | The Rail GC, Springfield, Ill. |
| 1988 | Betsy King | 207 (9-under) | The Rail GC, Springfield, Ill. |
| 1987 | Rosie Jones | 208 (8-under) | The Rail GC, Springfield, Ill. |
| 1986 | x-Betsy King | 205 (11-under) | The Rail GC, Springfield, Ill. |
| 1985 | Betsy King | 205 (11-under) | The Rail GC, Springfield, Ill. |
| 1984 | Cindy Hill | 207 (9-under) | The Rail GC, Springfield, Ill. |
| 1983 | x-Laurie Peterson | 210 (6-under) | The Rail GC, Springfield, Ill. |
| 1982 | JoAnne Carner | 202 (14-under) | The Rail GC, Springfield, Ill. |
| 1981 | JoAnne Carner | 205 (11-under) | The Rail GC, Springfield, Ill. |
| 1980 | Nancy Lopez | 275 (13-under) | The Rail GC, Springfield, Ill. |
| 1979 | Jo Ann Washam | 275 (13-under) | The Rail GC, Springfield, Ill. |
| 1978 | Pat Bradley | 276 (12-under) | The Rail GC, Springfield, Ill. |
| 1977 | Hollis Stacy | 271 (17-under) | The Rail GC, Springfield, Ill. |
| 1976 | x-Sandra Palmer | 213 (3-under) | The Rail GC, Springfield, Ill. |
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