| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 49.09 | Piron, Peyton (2015) (Batavia, IL) | Kane County Boys Championships(IL), 2015-05-09(#1) |
| B-400 | 2 | 49.16 | Mikel, Pat (2016) (Glenbard East, IL) | IL 3A Boys State Prelims(IL), 2015-05-29(#11) |
| B-400 | 3 | 49.41 | Kelly, Devon (2016) (St. Charles East, IL) | IL 3A Boys State Prelims(IL), 2015-05-29(#15) |
| B-400 | 4 | 49.73 | Komlanc, Joe (2016) (St. Charles East, IL) | IL 3A West Aurora Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 5 | 50.85 | McCue, Connor (2016) (West Aurora, IL) | West Aurora Boys Triangular(IL), 2015-04-28(#1) |
| B-400 | 6 | 51.53 | Buck, Zeke (2016) (Geneva, IL) | Kane County Boys Championships(IL), 2015-05-09(#5) |
| B-400 | 7 | 52.31 | Mcmarrow, Charles (2017) (Batavia, IL) | IL 3A West Aurora Boys Sectional(IL), 2015-05-21(#4) |
| B-400 | 8 | 52.44 | Sowinski, Justin (2016) (Bartlett, IL) | Upstate Eight Boys Conference Meet(IL), 2015-05-14(#8) |
| B-400 | 9 | 52.46 | Nebel, Justin (2015) (Geneva, IL) | Upstate Eight Boys Conference Meet(IL), 2015-05-14(#9) |
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| | | See more performances for B-400 | | |
