| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 48.29 | Higgins, Tyler (2017) (Highland, IL) | IL 2A Boys State Finals(IL), 2015-05-30(#1) |
| B-400 | 2 | 48.59 | Akins, Kevion (2015) (Cahokia, IL) | Winston Brown Invitational(IL), 2015-04-25(#1) |
| B-400 | 2 | 48.59 | Harris, Aaron (2016) (Lisle, IL) | USATF JO Region 7 Qualifier(IL), 2015-07-12(#1) |
| B-400 | 4 | 48.83 | Shadid, David (2015) (Notre Dame, IL) | IL 2A Boys State Finals(IL), 2015-05-30(#2) |
| B-400 | 5 | 49.08 | Porter, Aaron (2017) (Marion, IL) | IL 2A Boys State Finals(IL), 2015-05-30(#3) |
| B-400 | 6 | 49.50 | Blankenship, Sam (2015) (Johnsburg, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#1) |
| B-400 | 7 | 49.67 | Lyons, Tyran (2016) (Cahokia, IL) | IL 2A Boys State Prelims(IL), 2015-05-29(#4) |
| B-400 | 8 | 49.77 | Hooker, Dion (2015) (Sycamore, IL) | NIB-12 Boys Conference Meet(IL), 2015-05-15(#1) |
| B-400 | 9 | 49.80 | Charlton, Brett (2015) (Eureka, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#3) |
| B-400 | 10 | 49.89 | Moore, Will (2015) (Metamora, IL) | Gene Ward Invitational(IL), 2015-05-01(#1) |
| B-400 | 11 | 49.95 | McNeal, Deandre (2016) (Orr Community Academy, IL) | IL 2A Boys State Finals(IL), 2015-05-30(#4) |
| B-400 | 12 | 49.98 | Harris, B.J. (2015) (Peoria, IL) | IL 2A Macomb Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 13 | 49.99 | Pointer, Colfay (2016) (Rochelle, IL) | NIB-12 Boys Conference Meet(IL), 2015-05-15(#2) |
| B-400 | 14 | 50.02 | Stanley, Chris (2017) (Cahokia, IL) | IL 2A Triad Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 15 | 50.13 | Allen, Tyree (2015) (Hillcrest, IL) | AAU Central District Qualifier(IL), 2015-06-14(#3) |
| B-400 | 16 | 50.32 | Johnson, Tyler (2015) (St. Rita, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#9) |
| B-400 | 17 | 50.35 | Kramer, Christian (2015) (Harvard, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#2) |
| B-400 | 18 | 50.42 | Mcgee, Chris (2016) (Cahokia, IL) | Corey Siebert Invitational(MO), 2015-04-18(#2) |
| B-400 | 19 | 50.52 | West, Mitch (2017) (Montini Catholic, IL) | SCC Boys Conference Meet(IL), 2015-05-12(#1) |
| B-400 | 20 | 50.54 | Thompson, Keontaye (2015) (Johnson College Prep, IL) | CPS Boys Varsity Trials(IL), 2015-05-06(#5) |
| B-400 | 21 | 50.55 | Allen, Darius (2016) (Tinley Park, IL) | IL 2A Boys State Prelims(IL), 2015-05-29(#8) |
| B-400 | 22 | 50.58 | Stine, Connor (2015) (Olympia, IL) | Mahomet-Seymour Boys Invitational(IL), 2015-05-16(#1) |
| B-400 | 23 | 50.59 | Miller, Dillon (2015) (Jacksonville, IL) | IL 2A Lanphier Boys Sectional(IL), 2015-05-22(#2) |
| B-400 | 24 | 50.61 | Neubauer, Kyle (2015) (Burlington Central, IL) | Big Northern East Boys Conference Meet(IL), 2015-05-14(#1) |
| B-400 | 25 | 50.76 | Tomaszewski, Kai (2016) (Princeton, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#1) |
| B-400 | 26 | 50.84 | Coffey, Matt (2015) (Dixon, IL) | IL 2A Sterling Boys Sectional(IL), 2015-05-22(#3) |
| B-400 | 27 | 50.88 | Rieke, Jaxon (2015) (Eureka, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#10) |
| B-400 | 28 | 50.91 | Theel, Tyler (2016) (Wauconda Comm, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#3) |
| B-400 | 29 | 50.95 | Weaver, Zach (2018) (Reed-Custer, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#11) |
| B-400 | 30 | 50.99 | Vance, Vanharvey (2018) (Rich Central, IL) | IL 2A Boys State Prelims(IL), 2015-05-29(#11) |
| B-400 | 31 | 51.02 | Randa, Kody (2015) (Sandwich Community, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#2) |
| B-400 | 32 | 51.15 | Slovak, Eric (2015) (Vernon Hills, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#4) |
| B-400 | 33 | 51.16 | Williams, Charles (2015) (Johnson College Prep, IL) | CPS Boys Varsity Trials(IL), 2015-05-06(#3) |
| B-400 | 34 | 51.19 | Hilling, Dan (2015) (Triad, IL) | Mississippi Valley Boys Conference Meet(IL), 2015-05-13(#2) |
| B-400 | 35 | 51.24 | Watkins, Tanner (2015) (Sycamore, IL) | NIB-12 Boys Conference Meet(IL), 2015-05-15(#3) |
| B-400 | 36 | 51.27 | Mead, Lenny (2016) (Princeton, IL) | Metamora Boys ABC Invitational(IL), 2015-04-24(#4) |
| B-400 | 37 | 51.31 | Bruce, Terrance (2016) (Sterling, IL) | IL 2A Sterling Boys Sectional(IL), 2015-05-22(#4) |
| B-400 | 38 | 51.35 | Lathrop, Gus (2015) (East Richland, IL) | Robinson Boys Invitational(IL), 2015-04-24(#1) |
| B-400 | 39 | 51.38 | Blair, Tristan (2017) (Sacred Heart-Griffin, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#12) |
| B-400 | 40 | 51.39 | Vance, Harvey (2018) (Rich Central, IL) | IL 2A Hillcrest Boys Sectional(IL), 2015-05-22(#2) |
| B-400 | 41 | 51.41 | Culter, Alex (2017) (Mt. Zion, IL) | IL 2A Mattoon Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 42 | 51.43 | Marshall, Michael (2015) (Plano, IL) | Seneca Irish Invitational(IL), 2015-04-17(#1) |
| B-400 | 43 | 51.45 | Krause, Ryan (2015) (Triad, IL) | Granite City Invitational(IL), 2015-04-17(#6) |
| B-400 | 44 | 51.46 | Hays, Noah (2017) (Waterloo, IL) | IL 2A Triad Boys Sectional(IL), 2015-05-21(#4) |
| B-400 | 44 | 51.46 | Victoria, Michael (2015) (Harrisburg, IL) | Mascoutah Boys Military Classic(IL), 2015-04-24(#1) |
| B-400 | 46 | 51.47 | Frejowski, Tom (2015) (Northside Prep, IL) | CPS Boys Varsity Trials(IL), 2015-05-06(#7) |
| B-400 | 47 | 51.59 | Bailey, B.J. (2015) (Reed-Custer, IL) | Herscher Invitational(IL), 2015-05-01(#1) |
| B-400 | 48 | 51.66 | Warnes, Andrew (2016) (Tolono Unity, IL) | Shelbyville Boys Open(IL), 2015-05-16(#3) |
| B-400 | 49 | 51.67 | Strode, Tyler (2015) (Lanphier, IL) | Lanphier Boys Open(IL), 2015-04-11(#2) |
| B-400 | 50 | 51.68 | Iganccio, Isaiah (2016) (Mascoutah, IL) | Mississippi Valley Boys Conference Meet(IL), 2015-05-13(#3) |
| B-400 | 50 | 51.68 | Nathan, Tayjione (2016) (Hillcrest, IL) | Paul Wallace Classic (IL), 2015-01-01(#7) |
| B-400 | 52 | 51.72 | Lidinsky, Marc (Sandwich Community, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#3) |
| B-400 | 53 | 51.73 | Maisoneneve, Guy (Manteno, IL) | IL 2A Hillcrest Boys Sectional(IL), 2015-05-22(#3) |
| B-400 | 53 | 51.73 | Hernandez, Cesar (North Boone, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#5) |
| B-400 | 55 | 51.78 | Ames, Grant (2015) (Erie-Prophetstown, IL) | Three Rivers Boys Conference Meet(IL), 2015-05-18(#1) |
| B-400 | 56 | 51.80 | Crim, Corbin (2016) (Harrisburg, IL) | Southern Illinois River to River Boys Conference Meet(IL), 2015-05-14(#1) |
| B-400 | 57 | 51.84 | McCauley, Denzel (2015) (Carbondale Comm, IL) | Herrin Boys Invitational(IL), 2015-04-15(#2) |
| B-400 | 57 | 51.84 | Dailey, Connor (2016) (Lincoln-Way West, IL) | LWW Warrior Invitational(IL), 2015-05-01(#11) |
| B-400 | 59 | 51.85 | Bayer, Konrad (2016) (Benet Academy, IL) | IL 3A York Boys Sectional(IL), 2015-05-22(#6) |
| B-400 | 60 | 51.86 | Holden, David (2016) (Greenville, IL) | Jockish-Grandone Invitational(IL), 2015-05-02(#1) |
| B-400 | 61 | 51.89 | Hofer, Lucas (2017) (Geneseo, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#4) |
| B-400 | 62 | 51.90 | Grant, Ames (Erie-Prophetstown, IL) | Gebhardt-Worley Invitational(IL), 2015-04-11(#2) |
| B-400 | 63 | 52.04 | Bolfing, Austin (2015) (Taylorville, IL) | Capital Area Classic(IL), 2015-05-18(#3) |
| B-400 | 64 | 52.06 | Bastian, Cooper (2018) (Wheaton Academy, IL) | IL 2A Boys State Prelims(IL), 2015-05-29(#20) |
| B-400 | 65 | 52.08 | Jackson, Daryl (2015) (Lanphier, IL) | Solon Lion Boys Open(IL), 2015-04-14(#1) |
| B-400 | 65 | 52.08 | Finnegan, Hunter (Wheaton Academy, IL) | Chicago Christian Invitational(IL), 2015-05-01(#2) |
| B-400 | 67 | 52.11 | Mcsteen, Harry (2016) (Joliet Catholic Academy, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#5) |
| B-400 | 68 | 52.15 | Hari, Connor (Normal University, IL) | Bloomington/Normal Intercity Classic(IL), 2015-04-28(#4) |
| B-400 | 69 | 52.16 | Vanderlinden, Cameron (Marengo, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#6) |
| B-400 | 70 | 52.20 | Anglin, Demonte (2016) (Dusable, IL) | IL 2A Robeson Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 71 | 52.23 | Machado, Devantre (2016) (Mascoutah, IL) | St. Clair County Boys Championships(IL), 2015-04-28(#5) |
| B-400 | 72 | 52.29 | Collier, Craig (2017) (Freeburg Community, IL) | Cahokia Conference Championships(IL), 2015-05-06(#2) |
| B-400 | 72 | 52.29 | Riggs, Grant (2015) (Highland, IL) | Mississippi Valley Boys Conference Meet(IL), 2015-05-13(#5) |
| B-400 | 74 | 52.30 | Gillum, Jake (2017) (Metamora, IL) | Metamora Boys Triangular(IL), 2015-04-14(#1) |
| B-400 | 75 | 52.32 | Sherman, Drew (2015) (Centralia, IL) | IL 2A Triad Boys Sectional(IL), 2015-05-21(#5) |
| B-400 | 76 | 52.34 | Hartley, Gavin (2016) (Benton, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#19) |
| B-400 | 77 | 52.36 | Campbell, Lucas (2016) (East Peoria, IL) | IL 2A Macomb Boys Sectional(IL), 2015-05-21(#3) |
| B-400 | 77 | 52.36 | Vanharvey, Vance (2018) (Rich Central, IL) | Southland Athletic Boys Conference Meet(IL), 2015-05-13(#3) |
| B-400 | 77 | 52.36 | Brewster, Jordan (2018) (Frankfort, IL) | IL 2A Triad Boys Sectional(IL), 2015-05-21(#6) |
| B-400 | 80 | 52.37 | James, Noah (2016) (Jacksonville, IL) | Mark Twain/Becky Thatcher Relays(MO), 2015-05-01(#5) |
| B-400 | 80 | 52.37 | Jackson, Caleb (2016) (Hillsboro, IL) | IL 2A Lanphier Boys Sectional(IL), 2015-05-22(#4) |
| B-400 | 80 | 52.37 | Stewart, Bailey (2017) (Breese Central, IL) | IL 2A Triad Boys Sectional(IL), 2015-05-21(#7) |
| B-400 | 83 | 52.38 | Walker, Jonathon (2016) (Glenbard South, IL) | Glenbard South Boys Open(IL), 2015-04-11(#1) |
| B-400 | 84 | 52.42 | Lumas, Skylar (Dunbar Vocational Academy, IL) | IL 3A Lyons Township Boys Sectional(IL), 2015-05-22(#6) |
| B-400 | 85 | 52.43 | Davis, Jaelen (2016) (De La Salle Institute, IL) | Palatine Relays(IL), 2015-05-02(#6) |
| B-400 | 86 | 52.45 | Fiene, Nick (2015) (Illiana Christian, IL) | Metro Suburban East Boys Conference Meet(IL), 2015-05-15(#2) |
| B-400 | 87 | 52.47 | Mckinney, Eli (2015) (Civic Memorial, IL) | IL 2A Lanphier Boys Sectional(IL), 2015-05-22(#5) |
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| | | See more performances for B-400 | | |
