| Lane | Team | Squad | Seed |
|---|---|---|---|
| 1 | Chicago (St. Ignatius College Pr | G | 1:09.00 |
| 2 | Chicago (St. Ignatius College Pr | E | 1:07.00 |
| 3 | Chicago (St. Ignatius College Pr | C | 1:05.00 |
| 4 | Chicago (St. Ignatius College Pr | B | 1:04.00 |
| 5 | Mather High School | B | 1:05.00 |
| 6 | Chicago (St. Ignatius College Pr | D | 1:06.00 |
| 7 | Chicago (St. Ignatius College Pr | F | 1:08.00 |
| Lane | Team | Squad | Seed |
|---|---|---|---|
| 1 | Mather High School | A | 56.01 |
| 2 | South Shore International Colleg | B | 55.00 |
| 3 | Lombard (Montini) | A | 52.63 |
| 4 | South Shore International Colleg | A | 52.18 |
| 5 | Burbank (St. Laurence) | A | 52.21 |
| 6 | Chicago (St. Ignatius College Pr | A | 53.80 |
| 7 | Chicago (De La Salle) | A | 55.07 |
| 8 | Chicago (Jones) | A | 57.05 |