| Event | Rank | Mark | By | Meet |
| G-300H | 1 | 42.75 | Kimbro, Jenny (2016) (Jamaica, IL) (US#51) | IL 1A Girls State Finals(IL), 2015-05-23(#1) |
| G-300H | 2 | 44.59 | Carlson, Annie (2016) (Westmont, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#2) |
| | | National Elites above. State Elites below | | |
| G-300H | 3 | 45.48 | Berberich, Casey (2017) (Lebanon, IL) | Buzz Bradley Relays(IL), 2015-04-24(#1) |
| G-300H | 4 | 45.70 | Sparrgrove, Jorji (2015) (Central A & M, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#3) |
| G-300H | 5 | 46.09 | Podowicz, Emery (2017) (Clifton Central, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#4) |
| G-300H | 6 | 46.15 | Carlisle, Aubrie (2015) (Carthage Illini West, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#5) |
| G-300H | 7 | 46.64 | Peters, Clare (2016) (Clifton Central, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#6) |
| G-300H | 8 | 46.73 | Roman, Karissa (2015) (Wethersfield, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#7) |
| G-300H | 9 | 46.84 | Bristow, Elizabeth (2015) (St. Thomas More, IL) | Okaw Valley Girls Conference Meet(IL), 2015-05-05(#2) |
| G-300H | 10 | 46.86 | Wilkinson, Cora (2017) (Seneca, IL) | IL 1A Seneca Girls Sectional(IL), 2015-05-15(#1) |
| G-300H | 11 | 47.15 | Hood, Caitlin (2018) (Astoria, IL) | PJS Honor Roll Meet(IL), 2015-05-26(#3) |
| G-300H | 12 | 47.46 | Rodgers, Paige (2015) (Christopher, IL) | IL 1A Girls State Prelims(IL), 2015-05-21(#11) |
| G-300H | 13 | 47.51 | Dooley, Ryan (2016) (Central A & M, IL) | Sullivan Redskin Invitational(IL), 2015-05-05(#2) |
| G-300H | 14 | 47.61 | Meyer, Allison (2016) (Cambridge, IL) | IL 1A Rockridge Girls Sectional(IL), 2015-05-14(#1) |
| G-300H | 15 | 47.67 | Acamovic, Tanja (2016) (Hall, IL) | IL 1A Bureau Valley Girls Sectional(IL), 2015-05-15(#2) |
| G-300H | 16 | 48.04 | Atchison, Morgan (2017) (Chester, IL) | IL 1A Girls State Prelims(IL), 2015-05-21(#14) |
| G-300H | 17 | 48.08 | Mack, Alexandra (2018) (Orion, IL) | IL 1A Rockridge Girls Sectional(IL), 2015-05-14(#2) |
| G-300H | 18 | 48.15 | Walker, Kelsey (2015) (Leroy, IL) | IL 1A Girls State Prelims(IL), 2015-05-21(#15) |
| G-300H | 19 | 48.16 | Kiddoo, Carlea (2016) (Mercer County, IL) | IL 1A Rockridge Girls Sectional(IL), 2015-05-14(#3) |
| G-300H | 20 | 48.26 | Schmidt, Amanda (2017) (Gillespie, IL) | Capital Area Classic(IL), 2015-05-18(#1) |
| G-300H | 21 | 48.34 | Holloway, Paige (2017) (Byron, IL) | IL 1A Oregon Girls Sectional(IL), 2015-05-15(#1) |
| G-300H | 22 | 48.43 | Holthaus, Erin (2015) (Pana, IL) | Tri-County Invitational(IL), 2015-04-21(#1) |
| G-300H | 23 | 48.44 | Gayler, Makayla (2016) (Oakwood, IL) | IL 1A Tolono Unity Girls Sectional(IL), 2015-05-15(#3) |
| G-300H | 24 | 48.52 | Stalter, Alayna (2018) (Fisher, IL) | McLean County Meet(IL), 2015-05-05(#1) |
| G-300H | 25 | 48.65 | Yanke, Melanie (2015) (Henry-Senachwine, IL) | Rollie Morris Invitational(IL), 2015-04-18(#1) |
| G-300H | 26 | 48.74 | Griffith, Paige (2015) (Putnam County, IL) | PJS Honor Roll Meet(IL), 2015-05-26(#7) |
| G-300H | 27 | 48.79 | Mayer, Allison (Cambridge, IL) | Lincoln Trail Conference Meet(IL), 2015-05-08(#3) |
| G-300H | 28 | 48.98 | Merrifield, Lauren (2016) (Pana, IL) | IL 1A Central A&M Girls Sectional(IL), 2015-05-14(#4) |
| G-300H | 29 | 48.99 | Fishel, Ryann (2017) (Arcola, IL) | News-Gazette Honor Roll Meet(IL), 2015-05-18(#2) |
| G-300H | 30 | 49.00 | Francisco, Parker (2017) (St. Joseph-Ogden, IL) | IL 1A Tolono Unity Girls Sectional(IL), 2015-05-15(#4) |
| G-300H | 31 | 49.01 | Debaillie, Abigail (2015) (Orion, IL) | IL 1A Rockridge Girls Sectional(IL), 2015-05-14(#4) |
| G-300H | 32 | 49.04 | Gossett, Maddie (2017) (Christopher, IL) | IL 1A Girls State Prelims(IL), 2015-05-21(#20) |
| G-300H | 33 | 49.14 | Eissens, Breanna (2015) (Fulton, IL) | IL 1A Bureau Valley Girls Sectional(IL), 2015-05-15(#4) |
| G-300H | 34 | 49.16 | Feeney, Gracie (El Paso-Gridley, IL) | IL 1A Lewistown Girls Sectional(IL), 2015-05-15(#3) |
| G-300H | 35 | 49.40 | Piergies, Tonya (2015) (North Shore Country Day, IL) | Chicago Christian Invitational(IL), 2015-05-01(#2) |
| G-300H | 36 | 49.41 | Frichtl, Olivia (2018) (Paxton-Buckley-Loda, IL) | Monticello Lady Sages Invitational(IL), 2015-05-01(#6) |
| G-300H | 37 | 49.48 | Kieser, Samantha (2015) (Stark County, IL) | IL 1A Rockridge Girls Sectional(IL), 2015-05-14(#5) |
| G-300H | 38 | 49.55 | Seebauer, Cathie (St. Thomas More, IL) | STM Saber Invitational(IL), 2015-04-21(#2) |
| G-300H | 39 | 49.57 | Knox, Kylee (2015) (Harvest Christian, IL) | IL 1A Oregon Girls Sectional(IL), 2015-05-15(#3) |
| G-300H | 40 | 49.62 | Barthelme, Mckendra (2016) (Newton, IL) | IL 1A Newton Girls Sectional(IL), 2015-05-15(#1) |
| G-300H | 41 | 49.74 | Feagans, Lauren (2017) (Pleasant Plains, IL) | Sangamo Conference Championships(IL), 2015-05-05(#1) |
| G-300H | 42 | 49.79 | Johnson, Miranda (2017) (Serena, IL) | IL 1A Seneca Girls Sectional(IL), 2015-05-15(#3) |
| G-300H | 43 | 49.88 | Knuth, Mikayla (2017) (Marian Central, IL) | IL 2A Vernon Hills Girls Sectional(IL), 2015-05-15(#5) |
| G-300H | 44 | 49.96 | Hart, Hana (2018) (Henry-Senachwine, IL) | IL 1A Bureau Valley Girls Sectional(IL), 2015-05-15(#5) |
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| | | See more performances for G-300H | | |
