| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 50.84 | Sholl, Jacob (2015) (Carthage Illini West, IL) | Big River HS Series Championships(MO), 2015-02-22(#2) |
| B-400 | 2 | 52.55 | Meunier, Nicholas (2016) (Gibson City-Melvin-Sibley, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#3) |
| B-400 | 3 | 52.82 | Vancil, Zach (2017) (West Central, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#4) |
| B-400 | 4 | 53.40 | Bauer, Chris (Urbana University, IL) | Urbana Uni Meet #4(IL), 2015-03-18(#1) |
| B-400 | 5 | 53.68 | Hagene, Kyle (2016) (Sparta, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#6) |
| B-400 | 6 | 53.80 | Hemmen, Tyler (2015) (Argenta-Oreana, IL) | Urbana Uni Meet #4(IL), 2015-03-18(#2) |
| B-400 | 7 | 53.81 | Peifer, Brett (2015) (Shelbyville, IL) | Charleston EIU Boys Invitational - Small Schools(IL), 2015-03-21(#1) |
| B-400 | 8 | 53.82 | Skowronski, Ryan (2018) (Shelbyville, IL) | Jersey Winter Thaw Invitational(IL), 2015-03-14(#3) |
| B-400 | 9 | 53.88 | Howard, Dillon (2017) (Cumberland, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#7) |
| B-400 | 10 | 53.92 | Drees, Riley (2015) (Teutopolis, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#8) |
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| | | See more performances for B-400 | | |
