| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 1 | Riverside (R.-Brookfield) | A | 1:04.10 | |
| 2 | Hoffman Estates | A | 54.51 | |
| 3 | Rockford (Guilford) | A | 53.72 | |
| 4 | Minooka | A | 51.11 | |
| 5 | Bartlett | A | 52.80 | |
| 6 | Morton | A | 53.96 | |
| 7 | Chicago (Taft) | A | 56.50 |
| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 1 | Buffalo Grove | A | 50.84 | |
| 2 | Lombard (Montini) | A | 50.70 | |
| 3 | Mt. Prospect (Prospect) | A | 49.88 | |
| 4 | Chicago (Westinghouse Colleg | A | 48.56 | |
| 5 | Joliet (West) | A | 49.80 | |
| 6 | Belvidere (North) | A | 50.42 | |
| 7 | Conant | A | 50.83 | |
| 8 | Roselle (Lake Park) | A | 50.89 |