| Lane | Team | Squad | Seed |
|---|---|---|---|
| 1 | Oak Forest | A | 1:15.00 |
| 2 | Romeoville | A | DQ |
| 3 | Burbank (Reavis) | A | FS |
| 4 | Amos Alonzo Stagg | A | 55.60 |
| 5 | Oak Lawn (Community) | A | 57.00 |
| 6 | Tinley Park | A | 58.50 |
| 7 | Andrew | A | 1:02.00 |
| Lane | Team | Squad | Seed |
|---|---|---|---|
| 1 | Olympia Fields (Rich Central) | A | 54.21 |
| 2 | Marian Catholic | A | 53.02 |
| 3 | J. Sterling Morton Township | A | 52.82 |
| 4 | Mother Mcauley | A | 51.30 |
| 5 | Chicago Heights (Bloom Twp.) | A | 52.10 |
| 6 | Shepard | A | 52.90 |
| 7 | Joliet (West) | A | 53.12 |
| 8 | Willowbrook | A | 55.00 |