Section 1 of 2
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | Note |
|---|---|---|---|---|---|---|---|---|
| 2 | Vianney High School | A | NT | Unverified: | ||||
| 3 | Lafayette (Wildwood) High School | A | Meise | BUSH | Harding | Baca | 1:44.09 | Unverified: |
| 4 | Mehlville High School | A | Evans | Londal | Silies | Wolf | 1:47.36 | Unverified: Cape Invitational |
Section 2 of 2
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed | Note |
|---|---|---|---|---|---|---|---|---|
| 1 | Kirkwood High School | A | Malone | Smith | Wallace | Welch | 1:40.00 | Unverified: |
| 2 | Lindbergh High School | A | Mueller | Turner | Glaser | Deterding | DQ | Verified |
| 3 | St. Louis University High School | A | Bailey | Chaffee | Baur | Verzino | DQ | Verified |
| 4 | Webster Groves High School | A | Booth | Bias | Williamson | Bronner | 1:38.83 | Unverified: |
| 5 | Ladue Horton Watkins High School | A | Lee | Lucas | Whitley | Hawthorne | 1:39.56 | Unverified: |
