| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| G-400 | 1 | 57.33 | Mundekis, Cassie (2015) (Midwest Central, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#2) |
| G-400 | 2 | 57.72 | Kereta, Amanda (2015) (Henry-Senachwine, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#3) |
| G-400 | 3 | 58.38 | Keith, Sophie (2016) (Pinckneyville Comm, IL) | IL 1A Nashville Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 4 | 58.58 | Holland, Tessa (2015) (Fieldcrest, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#5) |
| G-400 | 5 | 58.83 | Reed, Megan (2016) (Cambridge, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#6) |
| G-400 | 6 | 59.24 | Harrod, Audrey (2017) (Hinckley-Big Rock, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#7) |
| G-400 | 7 | 59.60 | Staley, Jessica (2015) (Flora, IL) | IL 1A Girls State Finals(IL), 2015-05-23(#8) |
| G-400 | 8 | 59.98 | Burnett, Teal (2015) (Marshall, IL) | IL 1A Newton Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 9 | 1:00.22 | Henderson, Emma (2017) (Tuscola, IL) | Sullivan Redskin Invitational(IL), 2015-05-05(#2) |
| G-400 | 10 | 1:00.26 | Hoffert, Lindsey (2015) (Bureau Valley, IL) | Roger Washburn Invitational(IL), 2015-05-01(#2) |
| G-400 | 11 | 1:00.52 | Hendrickson, Marguerite (2018) (St. Thomas More, IL) | Monticello Lady Sages Invitational(IL), 2015-05-01(#2) |
| G-400 | 12 | 1:00.78 | Bush, Estella (2015) (Jamaica, IL) | IL 1A Tolono Unity Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 13 | 1:00.81 | Weber, Emma (Newton, IL) | IL 1A Newton Girls Sectional(IL), 2015-05-15(#3) |
| G-400 | 14 | 1:00.84 | Downs, Rebecca (2016) (Auburn, IL) | Jockish-Grandone Invitational(IL), 2015-05-02(#1) |
| G-400 | 15 | 1:00.89 | Kennedy, Tiana (2017) (Bureau Valley, IL) | Roger Washburn Invitational(IL), 2015-05-01(#3) |
| G-400 | 16 | 1:00.94 | Wagenbach, Bethany (Tremont, IL) | IL 1A Lewistown Girls Sectional(IL), 2015-05-15(#3) |
| G-400 | 17 | 1:01.02 | Richie, Taylor (2016) (Dwight, IL) | IL 1A Seneca Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 18 | 1:01.20 | Whitmore, Ashley (2016) (Byron, IL) | IL 1A Oregon Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 19 | 1:01.34 | Pace, Andrea (2017) (Clifton Central, IL) | Herscher Invitational(IL), 2015-05-01(#1) |
| G-400 | 20 | 1:01.36 | Yoggerst, Lexi (2015) (Riverton, IL) | Sangamon County Invitational(IL), 2015-05-08(#1) |
| G-400 | 21 | 1:01.70 | Freed, Gabby (2016) (Lexington, IL) | IL 1A Heyworth Girls Sectional(IL), 2015-05-14(#1) |
| G-400 | 22 | 1:01.77 | Devries, Carmen (2018) (Lena-Winslow, IL) | Byron Girls Invitational(IL), 2015-04-23(#1) |
| G-400 | 23 | 1:01.82 | Armstrong, Kayla (Luther North, IL) | Northeastern Athletic Conference Championships(IL), 2015-05-09(#1) |
| G-400 | 24 | 1:01.95 | Evelti, Lauren (2016) (St. Teresa, IL) | Macon County Championship(IL), 2015-04-28(#1) |
| G-400 | 25 | 1:02.00 | Forlines, Abby (2017) (Central A & M, IL) | Central Illinois Girls Conference Meet(IL), 2015-05-09(#2) |
| G-400 | 25 | 1:02.00 | Tunink, Kirsten (2018) (Sterling Newman, IL) | IL 1A Bureau Valley Girls Sectional(IL), 2015-05-15(#2) |
| G-400 | 25 | 1:02.00 | Krawl, Emily (2016) (Winchester, IL) | IL 1A Rushville-Industry Girls Sectional(IL), 2015-05-14(#1) |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | See more performances for G-400 | | |
