| MR | Fox Valley Conf Boys | 42.35 | Passarelli, Tepper, Noll, Kerber | Huntley | 2019 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed |
|---|---|---|---|---|---|---|---|
| 3 | McHenry | A | Wacaser | Kushman | Chojnowski | LaRose | 46.46 |
| 4 | Crystal Lake (Central) | A | Buehler | Dimopoulos | Stegmeyer | Tegel | 45.34 |
| 5 | Crystal Lake (Prairie Ridge) | A | Demakis | Koch | Mahon | Garner | 46.04 |
| 6 | Crystal Lake (South) | A | Pupillo | Prokos | Welte-hart | Velesco | 46.69 |
| Lane | Team | Squad | Athlete 1 | Athlete 2 | Athlete 3 | Athlete 4 | Seed |
|---|---|---|---|---|---|---|---|
| 2 | Huntley | A | Gronewold | Sargent | Torres | Costa | 44.87 |
| 3 | Hampshire | A | Yeats | Chanthaboury | Fikis | Rummell | 44.10 |
| 4 | Carpentersville (Dundee-Crown) | A | Farias | Kennedy | Freeman | Ledezma | 43.63 |
| 5 | Burlington (Central) | A | Zaccaria | Stahl | Sarvis | Milas | 44.00 |
| 6 | Cary (C.-Grove) | A | Nowik | Klipp | Ramirez | Hubka | 44.38 |
| 7 | Algonquin (Jacobs) | A | Mobeck | Brown | Donald | Boddie | 45.04 |