| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 48.56 | Spearman, Emanuel (2015) (Homewood-Flossmoor, IL) | IL 3A Homewood-Flossmoor Boys Sectional(IL), 2015-05-21(#1) |
| B-400 | 2 | 49.07 | Miranda, Nick (2017) (Lincoln-Way North, IL) | Southwest Suburban Red Boys Conference Meet(IL), 2015-05-14(#1) |
| B-400 | 3 | 49.39 | Brown, Jibreel (2016) (Carl Sandburg, IL) | IL 3A Downers Grove South Boys Sectional(IL), 2015-05-22(#2) |
| B-400 | 4 | 49.54 | Borchardt, George (2015) (Bradley-Bourbonnais, IL) | IL 3A Boys State Prelims(IL), 2015-05-29(#17) |
| B-400 | 5 | 49.67 | Goodwin, Kyle (2016) (Lincoln-Way North, IL) | IL 3A Homewood-Flossmoor Boys Sectional(IL), 2015-05-21(#4) |
| B-400 | 6 | 49.71 | Chapman, Peyton (2015) (Bolingbrook, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#4) |
| B-400 | 7 | 49.84 | Simpson, Matthew (2015) (Homewood-Flossmoor, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#6) |
| B-400 | 8 | 49.97 | Mcdaniel, Tifonte (2016) (Thornton Township, IL) | LWW Warrior Invitational(IL), 2015-05-01(#3) |
| B-400 | 9 | 50.62 | Bello, Anthony (2016) (Homewood-Flossmoor, IL) | AAU Central District Qualifier(IL), 2015-06-14(#5) |
| B-400 | 10 | 50.86 | Elmore, Tyler (2017) (Bolingbrook, IL) | Southwest Suburban Blue Boys Conference Meet(IL), 2015-05-14(#4) |
| B-400 | 11 | 50.96 | Roberson, Tyler (Homewood-Flossmoor, IL) | USATF JO Region 7 Qualifier(IL), 2015-07-12(#5) |
| B-400 | 12 | 51.23 | Swallow, Jacob (Lincoln-Way Central, IL) | IL 3A Homewood-Flossmoor Boys Sectional(IL), 2015-05-21(#6) |
| B-400 | 13 | 51.43 | Swallow, Jake (2015) (Lincoln-Way Central, IL) | Southwest Suburban Red Boys Conference Meet(IL), 2015-05-14(#5) |
| B-400 | 14 | 51.45 | Perakis, Jake (2017) (Bolingbrook, IL) | IL 3A Downers Grove South Boys Sectional(IL), 2015-05-22(#6) |
| B-400 | 15 | 51.50 | Parthemore, Ryan (2015) (Carl Sandburg, IL) | Pete Struck Eagle Classic(IL), 2015-05-01(#6) |
| B-400 | 16 | 51.66 | Rodgers, Derrius (2016) (Lockport Township , IL) | Southwest Suburban Blue Boys Conference Meet(IL), 2015-05-14(#5) |
| B-400 | 17 | 51.67 | Hamilton, Tommy (2015) (Lincoln-Way East, IL) | Carlin Nalley Invitational(IL), 2015-05-09(#6) |
| B-400 | 18 | 51.78 | Torpy, Chris (2016) (Carl Sandburg, IL) | IL 3A Downers Grove South Boys Sectional(IL), 2015-05-22(#7) |
| B-400 | 19 | 51.84 | Dailey, Connor (2016) (Lincoln-Way West, IL) | LWW Warrior Invitational(IL), 2015-05-01(#11) |
| B-400 | 20 | 52.07 | Phillips, Bradley (2016) (Joliet Central, IL) | Illinois Sprint Spectacular(IL), 2015-06-06(#2) |
| B-400 | 21 | 52.25 | Mitchell, Demitius (2015) (Thornton Township, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#17) |
| B-400 | 21 | 52.25 | Terry, Justin (2015) (Thornton Township, IL) | John Bell Invitational(IL), 2015-04-18(#5) |
| B-400 | 23 | 52.32 | Sykes, Korey (Lincoln-Way North, IL) | EIU Race At State(IL), 2015-05-29(#2) |
| B-400 | 24 | 52.41 | Sutton, Randy (2015) (Joliet West, IL) | Southwest Suburban Blue Boys Conference Meet(IL), 2015-05-14(#9) |
| B-400 | 25 | 52.45 | Hill, Isaiah (2017) (Joliet West, IL) | Southwest Suburban Blue Boys Conference Meet(IL), 2015-05-14(#1) |
| B-400 | 26 | 52.47 | Brock, Ryan (2015) (Lockport Township , IL) | Dick Beebe Track Classic(IL), 2015-04-18(#8) |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | See more performances for B-400 | | |
