| Event | Rank | Mark | By | Meet |
| B-400 | 1 | 49.02 | Hertz, Cory (2015) (Lakes, IL) (US#38) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#1) |
| B-400 | 2 | 49.58 | Thompson, Chris (2016) (Lemont, IL) (US#73) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#2) |
| B-400 | 3 | 49.72 | Strange, Steven (2016) (Oswego, IL) (US#85) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#3) |
| B-400 | 4 | 49.96 | Moss, Ty (2015) (Neuqua Valley, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#1) |
| B-400 | 5 | 49.98 | Espinosa, Zac (2015) (Neuqua Valley, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#2) |
| B-400 | 6 | 50.14 | Piron, Peyton (2015) (Batavia, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#3) |
| | | National Elites above. State Elites below | | |
| B-400 | 7 | 50.56 | Klamm, Carl (2015) (Evanston Township, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#4) |
| B-400 | 8 | 50.68 | Ifianayi, Paul (2015) (Elk Grove, IL) | Mid Suburban League Indoor Championships(IL), 2015-03-21(#1) |
| B-400 | 9 | 50.74 | Davis, Roosevelt (2016) (East St. Louis-Senior, IL) | Charleston EIU Boys Invitational - Large Schools(IL), 2015-03-21(#1) |
| B-400 | 10 | 50.81 | Buchanan, Deshon (2016) (Belleville West, IL) | Centennial Charger Classic(IL), 2015-03-07(#2) |
| B-400 | 11 | 50.87 | Williams, Jaquere (2017) (Waubonsie Valley, IL) | Arkansas HS Invitational(AR), 2015-01-17(#23) |
| B-400 | 12 | 50.91 | Michl, Isaiah (2015) (Edwardsville, IL) | Edwardsville Tiger Indoor Invitational(IL), 2015-03-13(#1) |
| B-400 | 13 | 51.25 | Walker, Isaac (2015) (Warren Township, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#5) |
| B-400 | 14 | 51.27 | Connor, Steven (2015) (Wheaton North, IL) | DuPage Valley Boys Indoor Conference Meet(IL), 2015-03-20(#1) |
| B-400 | 15 | 51.36 | Chapman, Peyton (2015) (Bolingbrook, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 16 | 51.38 | Cagigal, Jordan (2016) (Metea Valley, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#5) |
| B-400 | 17 | 51.41 | Spearman, Emanuel (2015) (Homewood-Flossmoor, IL) | Dorothy Dawson Invitational(IL), 2015-02-07(#1) |
| B-400 | 18 | 51.43 | Reilly, James (2015) (Hinsdale Central, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 19 | 51.44 | Simpson, Matthew (2015) (Homewood-Flossmoor, IL) | Normal West Boys Invitational(IL), 2015-02-28(#2) |
| B-400 | 20 | 51.50 | Rodriguez, Alex (2015) (Brother Rice, IL) | Chicago Catholic League Indoor Championships(IL), 2015-03-21(#1) |
| B-400 | 21 | 51.56 | Wells, Octavian (2016) (Grant Community, IL) | Byron Indoor Preview(IL), 2015-03-14(#1) |
| B-400 | 22 | 51.62 | Edwards, Michael (2016) (Zion-Benton Twnshp, IL) | Lake Michigan Boys Invitational(WI), 2015-03-21(#4) |
| B-400 | 23 | 51.63 | Miller, John (2015) (Loyola Academy, IL) | Chicago Catholic League Indoor Championships(IL), 2015-03-21(#2) |
| B-400 | 24 | 51.71 | Streater, Tremain (2016) (Collinsville, IL) | Edwardsville Tiger Indoor Invitational(IL), 2015-03-13(#2) |
| B-400 | 24 | 51.71 | Treadwell, Juwaun (2017) (Crete-Monee, IL) | Gene Armer Invitational(IL), 2015-03-21(#1) |
| B-400 | 26 | 51.79 | Foster, Antwon (2016) (Prosser Career Academy, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#6) |
| B-400 | 26 | 51.79 | Svoboda, Kyle (2015) (John Hersey, IL) | Mid Suburban League Indoor Championships(IL), 2015-03-21(#2) |
| B-400 | 28 | 51.93 | Goodwin, Kyle (2016) (Lincoln-Way North, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#2) |
| B-400 | 29 | 51.98 | Bell, Brandon (2016) (Wheaton-Warrenville South, IL) | DuPage Valley Boys Indoor Conference Meet(IL), 2015-03-20(#2) |
| B-400 | 30 | 52.05 | Ruscitti, Alex (2015) (Plainfield North, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#9) |
| B-400 | 30 | 52.05 | Jones, Trinton (2015) (Evanston Township, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#10) |
| B-400 | 32 | 52.07 | Melynchuk, Brandon (2015) (Barrington, IL) | Mid Suburban League Indoor Championships(IL), 2015-03-21(#3) |
| B-400 | 33 | 52.13 | Perkins, Chauncie (2015) (DeKalb, IL) | NIB-12 Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 34 | 52.14 | Johnson, Sebastien (2015) (Oak Park-River Forest, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 35 | 52.17 | Davis, Antonio (2017) (Bloom Township, IL) | Proviso East Midwest Classic(IL), 2015-03-28(#2) |
| B-400 | 36 | 52.18 | Borchardt, George (2015) (Bradley-Bourbonnais, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#3) |
| B-400 | 37 | 52.20 | Streator, Tremain (2015) (Collinsville, IL) | Charleston EIU Boys Invitational - Large Schools(IL), 2015-03-21(#3) |
| B-400 | 38 | 52.24 | Wolz, Justin (2016) (Minooka Community, IL) | Lockport Boys Open(IL), 2015-02-28(#1) |
| B-400 | 39 | 52.26 | Guzman, Cesar (2016) (Plainfield South, IL) | Illinois Top Times Championships - Class 3A(IL), 2015-03-28(#13) |
| B-400 | 40 | 52.28 | Lillard, Dan (2016) (Hinsdale Central, IL) | Proviso West Boys Invitational(IL), 2015-02-28(#3) |
| B-400 | 41 | 52.30 | Elmore, Tyler (2017) (Bolingbrook, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#4) |
| B-400 | 42 | 52.41 | Wright-Madison, Chris (2015) (Oak Park-River Forest, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#2) |
| B-400 | 43 | 52.44 | Mikel, Pat (2016) (Glenbard East, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#6) |
| B-400 | 43 | 52.44 | Parker, Tavolis (2015) (J Sterling Morton, IL) | WSC-Gold Boys Indoor Conference Meet(IL), 2015-03-20(#1) |
| B-400 | 45 | 52.48 | Bredwood, Jeremy (2015) (Grant Community, IL) | Lake Michigan Boys Invitational(WI), 2015-03-21(#6) |
| B-400 | 46 | 52.51 | Lindstrom, Andrew (2015) (Glenbard West, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#2) |
| B-400 | 47 | 52.66 | Johnson, Cedric (2015) (Bloom Township, IL) | Gene Armer Invitational(IL), 2015-03-21(#2) |
| B-400 | 47 | 52.66 | Kelly, Devon (2016) (St. Charles East, IL) | York Boys Invitational(IL), 2015-03-06(#1) |
| B-400 | 49 | 52.68 | Komlanc, Joe (2016) (St. Charles East, IL) | York Boys Invitational(IL), 2015-03-06(#2) |
| B-400 | 50 | 52.69 | Miller, Julienne (2015) (Proviso West, IL) | Proviso West Boys Invitational(IL), 2015-02-28(#4) |
| B-400 | 51 | 52.75 | Garron, Brad (2017) (Evanston Township, IL) | CSL-South Boys Indoor Conference Meet(IL), 2015-03-20(#2) |
| B-400 | 52 | 52.79 | Dean, Knikolas (Homewood-Flossmoor, IL) | Homewood - Flossmoor Co-Ed Invitational(IL), 2015-03-07(#1) |
| B-400 | 53 | 52.81 | Gleeson, Robbie (2016) (Cary-Grove Community, IL) | Nelson Daniels Classic - Large Schools(WI), 2015-03-21(#3) |
| B-400 | 54 | 52.82 | Gibson, Chris (2015) (Lane Technical, IL) | Gene Armer Invitational(IL), 2015-03-21(#3) |
| B-400 | 55 | 52.83 | Harris, Jevais (2016) (Hinsdale South, IL) | WSC-Gold Boys Indoor Conference Meet(IL), 2015-03-20(#2) |
| B-400 | 56 | 52.84 | Anderson, Deante (2018) (East St. Louis-Senior, IL) | De La Salle / ESL Invitational (IL), 2015-02-28(#3) |
| B-400 | 57 | 52.89 | Sutton, Randy (2015) (Joliet West, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#5) |
| B-400 | 58 | 52.90 | Giovannelli, Dominick (2015) (Glenwood, IL) | Normal West Boys Invitational(IL), 2015-02-28(#3) |
| B-400 | 58 | 52.90 | Galloway, Jaylen (2016) (Thornton Fractional North, IL) | Gene Armer Invitational(IL), 2015-03-21(#4) |
| B-400 | 60 | 52.92 | Suarez, Greg (2015) (Prospect, IL) | Proviso East Midwest Classic(IL), 2015-03-28(#3) |
| B-400 | 61 | 52.93 | Roberson, Tyler (Homewood-Flossmoor, IL) | SWSC-Blue F/S Boys Invitational(IL), 2015-01-01(#1) |
| B-400 | 62 | 53.02 | Hillegass, Alex (2016) (Normal Community West, IL) | Big 12 Boys Indoor Conference Meet(IL), 2015-03-10(#2) |
| B-400 | 63 | 53.04 | Swallow, Joe (2015) (Lincoln-Way Central, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#6) |
| B-400 | 64 | 53.05 | Malinowski, Mike (2016) (Minooka Community, IL) | Lockport Boys Open(IL), 2015-02-28(#3) |
| B-400 | 65 | 53.07 | Parthemore, Ryan (2015) (Carl Sandburg, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#7) |
| B-400 | 65 | 53.07 | Hawkins, Donnie (2015) (Willowbrook, IL) | WSC-Gold Boys Indoor Conference Meet(IL), 2015-03-20(#3) |
| B-400 | 67 | 53.11 | Givantt, Kelvin (2015) (Metea Valley, IL) | West Lafayette Individuals(IN), 2015-03-07(#2) |
| B-400 | 68 | 53.13 | Bienduga, Alex (2016) (Wheaton North, IL) | DuPage Valley Boys Indoor Conference Meet(IL), 2015-03-20(#3) |
| B-400 | 68 | 53.13 | Moran, Luke (2016) (Oswego, IL) | Centennial Charger Classic(IL), 2015-03-07(#1) |
| B-400 | 68 | 53.13 | Griffin, Nate (2016) (Providence Catholic, IL) | Chicago Catholic League Indoor Championships(IL), 2015-03-21(#4) |
| B-400 | 68 | 53.13 | James, Kameron (2016) (Proviso East, IL) | WSC-Gold Boys Indoor Conference Meet(IL), 2015-03-20(#4) |
| B-400 | 72 | 53.14 | Mcneal, Deondre (2016) (Prosser Career Academy, IL) | ISU HS Invitational(IL), 2015-03-07(#1) |
| B-400 | 73 | 53.18 | Christie, Ryan (2016) (Evanston Township, IL) | Lake Michigan Boys Invitational(WI), 2015-03-21(#10) |
| B-400 | 74 | 53.20 | Arroyo, Aaron (2018) (Minooka Community, IL) | Homewood - Flossmoor Co-Ed Invitational(IL), 2015-03-07(#2) |
| B-400 | 75 | 53.23 | Mauge, Richie (2016) (Marist, IL) | Bolingbrook Fast Times Boys Invitational(IL), 2015-03-28(#2) |
| B-400 | 76 | 53.25 | Ferguson, Carey (2017) (Bloomington, IL) | Big 12 Boys Indoor Conference Meet(IL), 2015-03-10(#3) |
| B-400 | 77 | 53.26 | Smith, Will (2017) (Crete-Monee, IL) | Proviso East Midwest Classic(IL), 2015-03-28(#5) |
| B-400 | 78 | 53.29 | Smith, Martin (Naperville North, IL) | DuPage Valley Boys Indoor Conference Meet(IL), 2015-03-20(#4) |
| B-400 | 79 | 53.31 | Hoover, Christian (2015) (Homewood-Flossmoor, IL) | Homewood-Flossmoor Boys Quad #2(IL), 2015-02-21(#1) |
| B-400 | 80 | 53.36 | Agee, Jacobi (2016) (Bloom Township, IL) | Proviso East Midwest Classic(IL), 2015-03-28(#6) |
| B-400 | 81 | 53.39 | Bello, Anthony (2016) (Homewood-Flossmoor, IL) | Homewood-Flossmoor Boys Quad #2(IL), 2015-02-21(#2) |
| B-400 | 82 | 53.41 | Immke, Josh (2015) (Normal Community West, IL) | Normal West Boys Invitational(IL), 2015-02-28(#4) |
| B-400 | 83 | 53.44 | O'Donnell, Brendan (2016) (Huntley, IL) | Sycamore Boys Invitational(IL), 2015-03-11(#1) |
| B-400 | 83 | 53.44 | Session, William (2016) (Belleville East, IL) | Charleston EIU Boys Invitational - Large Schools(IL), 2015-03-21(#7) |
| B-400 | 85 | 53.52 | Taylor, Mike (2018) (Downers Grove North, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 85 | 53.52 | Elms, Nick (2016) (Conant, IL) | Mid Suburban League Indoor Championships(IL), 2015-03-21(#4) |
| B-400 | 87 | 53.58 | Gage, Brandon (2017) (Oak Park-River Forest, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-400 | 88 | 53.67 | Rinaldi, Phil (2016) (Lincoln-Way Central, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#8) |
| B-400 | 88 | 53.67 | Mogorovic, Jakob (2016) (Lyons Township, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#3) |
| B-400 | 90 | 53.68 | Perry, Rene (2015) (Edwardsville, IL) | Centennial Charger Classic(IL), 2015-03-07(#7) |
| B-400 | 91 | 53.71 | Magee, Arnold (2015) (Waukegan , IL) | Antioch D117 Invitational(IL), 2015-02-28(#3) |
| B-400 | 92 | 53.74 | Rustay, Declan (2018) (Hoffman Estates, IL) | Mid Suburban League Indoor Championships(IL), 2015-03-21(#5) |
| B-400 | 93 | 53.78 | Mcmarrow, Charles (2017) (Batavia, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#8) |
| B-400 | 94 | 53.79 | Mcginnis, Jack (Downers Grove North, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#4) |
| B-400 | 95 | 53.82 | Echols, Cj (Centennial, IL) | Charleston EIU Boys Invitational - Large Schools(IL), 2015-03-21(#8) |
| B-400 | 96 | 53.83 | Santoro, Arthur (2017) (Jones College Prep, IL) | Chicago U-High Meet #3(IL), 2015-03-13(#2) |
| B-400 | 97 | 53.87 | Smith, Baron (2015) (West Aurora, IL) | Upstate Eight Boys Indoor Conference Meet(IL), 2015-03-20(#9) |
| B-400 | 97 | 53.87 | Marszewski, Andrew (Downers Grove North, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#2) |
| B-400 | 99 | 53.95 | Weaver, Zach (2015) (McHenry, IL) | Illinois Top Times Championships - Class 1A(IL), 2015-03-27(#10) |
| B-400 | 100 | 53.96 | Protsiv, Mark (2015) (Jones College Prep, IL) | Chicago U-High Meet #3(IL), 2015-03-13(#3) |
| B-400 | 101 | 53.97 | Brown, Jibreel (2016) (Carl Sandburg, IL) | Southwest Suburban Boys Indoor Conference Meet(IL), 2015-03-21(#9) |
| B-400 | 101 | 53.97 | Abrahm, Dan (2016) (Lockport Township , IL) | Homewood - Flossmoor Co-Ed Invitational(IL), 2015-03-07(#4) |
| B-400 | 103 | 53.98 | Deal, Austin (2016) (Plainfield South, IL) | AAU Northern Indoor Championships(IL), 2015-01-18(#6) |
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