| Event | Rank | Mark | By | Meet |
| B-600 | 1 | 1:22.72 | Lima, Alex (2015) (Lyons Township, IL) (US#33) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#1) |
| B-600 | 2 | 1:22.76 | Moss, Ty (2015) (Neuqua Valley, IL) (US#37) | Proviso West Boys Invitational(IL), 2015-02-28(#1) |
| B-600 | 3 | 1:23.00 | Klamm, Carl (2015) (Evanston Township, IL) (US#44) | Evanston Boys Open #2(IL), 2015-03-07(#1) |
| B-600 | 4 | 1:24.67 | Plowman, Matthew (2015) (York Community, IL) | York Boys Invitational(IL), 2015-03-06(#1) |
| | | National Elites above. State Elites below | | |
| B-600 | 5 | 1:25.63 | Chapman, Peyton (2015) (Bolingbrook, IL) | Homewood - Flossmoor Co-Ed Invitational(IL), 2015-03-07(#2) |
| B-600 | 6 | 1:25.87 | Svoboda, Kyle (2015) (John Hersey, IL) | York Boys Invitational(IL), 2015-03-06(#2) |
| B-600 | 7 | 1:26.07 | Dowell, Bradley (2015) (Wheaton North, IL) | Proviso West Boys Invitational(IL), 2015-02-28(#3) |
| B-600 | 8 | 1:26.56 | Simpson, Matthew (2015) (Homewood-Flossmoor, IL) | Homewood-Flossmoor Boys Quad #2(IL), 2015-02-21(#2) |
| B-600 | 9 | 1:26.60 | Falotico, Gavin (2015) (Palatine, IL) | Proviso West Boys Meet #2(IL), 2015-02-13(#1) |
| B-600 | 10 | 1:26.61 | Gawthrop, Ben (2015) (Lyons Township, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#4) |
| B-600 | 11 | 1:26.70 | Hutsalyuk, Pavlo (2015) (Lane Technical, IL) | Proviso East Boys Triangular #1(IL), 2015-02-04(#1) |
| B-600 | 12 | 1:26.90 | Ziegenhorn, Kevin (2015) (John Hersey, IL) | York Boys Invitational(IL), 2015-03-06(#3) |
| B-600 | 13 | 1:26.94 | Crail, Nathan (2015) (Glenbard West, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#5) |
| B-600 | 14 | 1:27.12 | Lewandowski, Steve (2015) (St. Charles North, IL) | York Boys Invitational(IL), 2015-03-06(#4) |
| B-600 | 15 | 1:27.30 | Clevenger, Ryan (2015) (Downers Grove North, IL) | Proviso West Boys Meet #3(IL), 2015-02-20(#2) |
| B-600 | 16 | 1:27.40 | Espinosa, Zac (2015) (Neuqua Valley, IL) | Morton Boys Meet #1(IL), 2015-02-13(#2) |
| B-600 | 17 | 1:27.58 | Suda, Chris (2015) (St. Charles North, IL) | York Boys Invitational(IL), 2015-03-06(#6) |
| B-600 | 18 | 1:27.77 | Gartner, Griffin (2015) (Hinsdale Central, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#6) |
| B-600 | 19 | 1:28.68 | Dale, Nathan (2015) (York Community, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#4) |
| B-600 | 20 | 1:29.00 | Bender, Kyle (2015) (Neuqua Valley, IL) | Morton Boys Meet #1(IL), 2015-02-13(#3) |
| B-600 | 21 | 1:29.20 | Brown, Graham (2015) (Palatine, IL) | Bolingbrook Boys Triangular(IL), 2015-02-28(#2) |
| B-600 | 22 | 1:29.30 | Victoria, Michael (2015) (Harrisburg, IL) | Marion Boys Early Bird Indoor(IL), 2015-02-28(#1) |
| B-600 | 23 | 1:29.46 | Carter, Joe (2015) (Downers Grove North, IL) | WSC-Silver Boys Indoor Conference Meet(IL), 2015-03-21(#5) |
| B-600 | 24 | 1:29.56 | Lever, Jack (2015) (Edwardsville, IL) | Lockport Boys Open(IL), 2015-02-28(#2) |
| B-600 | 25 | 1:29.68 | Ngo, Stephen (2015) (Whitney Young, IL) | Proviso West Boys Invitational(IL), 2015-02-28(#8) |
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| | | See more performances for B-600 | | |
