| Lane | Team | Squad | Seed |
|---|---|---|---|
| 3 | Joliet (West) | A | 44.98 |
| 4 | Yorkville (H.S.) | A | 44.80 |
| 5 | Joliet (Central) | A | 44.97 |
| 6 | Aurora (West Aurora) | A | 46.50 |
| Lane | Team | Squad | Seed |
|---|---|---|---|
| 1 | Romeoville (H.S.) | A | 44.38 |
| 2 | Oswego (East) | A | 44.08 |
| 3 | Plainfield (South) | A | 43.56 |
| 4 | Minooka | A | 42.02 |
| 5 | Plainfield (North) | A | 42.59 |
| 6 | Plainfield (East) | A | 43.91 |
| 7 | Plainfield (Central) | A | 44.23 |
| 8 | Oswego | A | 44.74 |