| Event | Rank | Mark | By | Meet |
| B-DMR | 1 | 10:18.90 | Boys Relay (Neuqua Valley, IL) (US#33) | Valley Triangular(IL), 2012-05-01(#1) |
| B-DMR | 2 | 10:21.70 | Boys Relay (Palatine, IL) (US#46) | York / Palatine Boys Dual(IL), 2012-04-07(#1) |
| B-DMR | 3 | 10:25.61 | Boys Relay (Belvidere North, IL) (US#63) | Hub Relays(IL), 2012-04-14(#1) |
| B-DMR | 4 | 10:26.10 | Boys Relay (York Community, IL) (US#66) | York / Palatine Boys Dual(IL), 2012-04-07(#2) |
| B-DMR | 5 | 10:31.30 | Boys Relay (Metea Valley, IL) | Valley Triangular(IL), 2012-05-01(#2) |
| | | National Elites above. State Elites below | | |
| B-DMR | 6 | 10:36.50 | Boys Relay (Lane Technical, IL) | Hinsdale Relays(IL), 2012-04-07(#1) |
| B-DMR | 7 | 10:41.30 | Boys Relay (O'Fallon, IL) | O'Fallon Relays(IL), 2012-03-30(#1) |
| B-DMR | 8 | 10:41.50 | Boys Relay (Conant, IL) | Conant Relays(IL), 2012-04-07(#1) |
| B-DMR | 9 | 10:44.70 | Boys Relay (Edwardsville, IL) | O'Fallon Relays(IL), 2012-03-30(#2) |
| B-DMR | 10 | 10:49.60 | Boys Relay (Deerfield, IL) | Spartan Relays(IL), 2012-04-27(#1) |
| B-DMR | 11 | 10:50.50 | Boys Relay (Buffalo Grove, IL) | Palatine Relays(IL), 2012-04-28(#2) |
| B-DMR | 12 | 10:52.40 | Boys Relay (St. Ignatius, IL) | Palatine Relays(IL), 2012-04-28(#3) |
| B-DMR | 13 | 10:53.30 | Boys Relay (Downers Grove South, IL) | Hinsdale Relays(IL), 2012-04-07(#2) |
| B-DMR | 14 | 10:54.00 | Boys Relay (Fremd, IL) | Palatine Relays(IL), 2012-04-28(#4) |
| B-DMR | 15 | 10:54.45 | Boys Relay (Plainfield South, IL) | Lyons Township Relays(IL), 2012-04-20(#3) |
| B-DMR | 16 | 10:56.30 | Boys Relay (Hinsdale Central, IL) | Hinsdale Relays(IL), 2012-04-07(#3) |
| B-DMR | 17 | 10:59.05 | Boys Relay (East St. Louis-Senior, IL) | Capitol City Relays(MO), 2012-04-14(#1) |
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| | | See more performances for B-DMR | | |
| Event | Rank | Mark | By | Meet |
| G-DMR | 1 | 12:36.70 | Girls Relay (Prospect, IL) | Prospect Girls Relays(IL), 2012-04-05(#1) |
| | | National Elites above. State Elites below | | |
| G-DMR | 2 | 12:57.50 | Girls Relay (Palatine, IL) | Palatine Relays(IL), 2012-04-28(#1) |
| G-DMR | 3 | 13:05.09 | Girls Relay (O'Fallon, IL) | SW Illinois Relays(IL), 2012-03-24(#1) |
| G-DMR | 4 | 13:05.96 | Girls Relay (Yorkville, IL) | Plainfield North Tiger Relays(IL), 2012-04-07(#1) |
| G-DMR | 5 | 13:06.42 | Girls Relay (Edwardsville, IL) | SW Illinois Relays(IL), 2012-03-24(#2) |
| G-DMR | 6 | 13:09.52 | Girls Relay (Minooka Community, IL) | Plainfield North Tiger Relays(IL), 2012-04-07(#2) |
| G-DMR | 7 | 13:19.70 | Girls Relay (Fremd, IL) | Palatine Relays(IL), 2012-04-28(#2) |
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| | | See more performances for G-DMR | | |
