| MR | Kishwaukee River Conf. | 3:29.40 | Kozin, Leonard, Borhart, Schirmer | Marengo | 2018 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed |
|---|---|---|---|---|---|---|---|
| 1 | Marengo | A | Cieslak | Ray | Palanos | Lopez | 3:47.28 |
| 2 | Woodstock (H.S) | A | Wickersheim | Greenlee | Novelle | Hodory | 3:42.91 |
| 3 | Richmond (R.-Burton) | A | Rockwell | Rockwell | Kalinowski | Gunderson | NT |
| 4 | Woodstock (North) | A | 3:36.97 | ||||
| 5 | Johnsburg | A | Arnold | Benz | Hiller | Hull | 3:47.17 |
| 6 | Harvard | A | Austin | Rosas | Gonzalez | Pineda | 3:48.96 |