| Event | Rank | Mark | By | Meet |
| G-400 | 1 | 54.79 | Hudson, Mariya (2017) (Cahokia, IL) (US#63) | IL 2A Girls State Finals(IL), 2015-05-23(#1) |
| G-400 | 2 | 55.18 | Mcclain, Amanda (2015) (Sullivan, IL) (US#96) | IL 1A Girls State Finals(IL), 2015-05-23(#1) |
| G-400 | 3 | 56.18 | Liz, Karina (2016) (Aurora Central Catholic, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#2) |
| | | National Elites above. State Elites below | | |
| G-400 | 4 | 56.73 | Bax, Deven (2015) (Lincoln-Way West, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#4) |
| G-400 | 5 | 56.92 | Ward, Whitney (2016) (Brooks College Prep Academy, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#3) |
| G-400 | 5 | 56.92 | Heinzer, Allie (2016) (Kaneland , IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#3) |
| G-400 | 7 | 56.93 | Jones, Amber (2016) (Rich South, IL) | USATF Youth National Championships 17-18(IL), 2015-07-05(#2) |
| G-400 | 8 | 57.50 | Desrosiers, Gabrielle (2016) (North Lawndale Charter, IL) | DuPage Track Invitational(IL), 2015-07-18(#2) |
| G-400 | 9 | 57.94 | Beeman, Alison (2016) (Wauconda Comm, IL) | IL 2A Girls State Finals(IL), 2015-05-23(#5) |
| G-400 | 10 | 57.98 | Crudup, Shamarra (2016) (Westinghouse Career Academy, IL) | IL 3A Girls State Prelims(IL), 2015-05-22(#10) |
| G-400 | 10 | 57.98 | Keyes, Likkaya (2018) (Morgan Park, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#2) |
| G-400 | 12 | 58.26 | Stricker, Sophie (2016) (Harvard, IL) | IL 2A Girls State Finals(IL), 2015-05-23(#6) |
| G-400 | 13 | 58.50 | Cobert, Rachel (2016) (Erie-Prophetstown, IL) | IL 2A Girls State Finals(IL), 2015-05-23(#7) |
| G-400 | 14 | 58.54 | Golliday, Charde (2016) (Mount Vernon, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#7) |
| G-400 | 15 | 58.56 | Henry, Alexis (2016) (Springfield Southeast, IL) | Bloomington Lady Raider Invitational, 2015-04-17(#1) |
| G-400 | 16 | 58.65 | Prear, Kelsie (2015) (Morgan Park, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#4) |
| G-400 | 17 | 58.72 | Wesley, Destiny (2015) (Thornridge, IL) | IL 2A Kankakee Girls Sectional(IL), 2015-05-14(#2) |
| G-400 | 18 | 58.95 | Grieves, Alexis (2016) (Metamora, IL) | Mid Illini Girls Conference Meet(IL), 2015-05-07(#1) |
| G-400 | 19 | 58.98 | Thompson, Alex (2015) (University of Chicago Lab School, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#11) |
| G-400 | 20 | 59.03 | Drab, Elizabeth (2017) (Saint Viator, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#12) |
| G-400 | 21 | 59.26 | Thrash, Kailyn (2017) (De La Salle Institute, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#14) |
| G-400 | 22 | 59.33 | Mainor, Sharon (2016) (Champaign Central, IL) | Jane Dickens Invitational(IL), 2015-06-20(#4) |
| G-400 | 23 | 59.57 | Hilton, Rachel (2016) (East Peoria, IL) | IL 2A Dunlap Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 24 | 59.58 | Unseth, Muriel (2015) (Dunlap, IL) | PJS Honor Roll Meet(IL), 2015-05-26(#3) |
| G-400 | 25 | 59.66 | Olcott, Abby (2016) (Dunlap, IL) | IL 2A Dunlap Girls Sectional(IL), 2015-05-15(#2) |
| G-400 | 26 | 59.84 | Mcsweeney, Quincy (2015) (Eureka, IL) | Roger Washburn Invitational(IL), 2015-05-01(#1) |
| G-400 | 27 | 59.94 | Mehta, Twinkle (2015) (Mahomet-Seymour, IL) | News-Gazette Honor Roll Meet(IL), 2015-05-18(#2) |
| G-400 | 28 | 59.95 | Mclaurin, Brittany (2016) (Johnson College Prep, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#15) |
| G-400 | 29 | 59.96 | Wasserberg, Molly (2016) (Vernon Hills, IL) | North Suburban Girls Conference Meet(IL), 2015-05-07(#5) |
| G-400 | 30 | 1:00.16 | Ricca, Cece (2016) (Notre Dame, IL) | Big 12 Girls Conference Meet(IL), 2015-05-08(#3) |
| G-400 | 31 | 1:00.28 | Vero, Shea (2016) (Rosary, IL) | IL 2A Plano Girls Sectional(IL), 2015-05-15(#2) |
| G-400 | 32 | 1:00.37 | Griffiths, Emma (2015) (Providence Catholic, IL) | East Suburban Catholic Girls Conference Meet(IL), 2015-05-06(#1) |
| G-400 | 32 | 1:00.37 | Meyer, Madison (2016) (Carterville, IL) | IL 2A Triad Girls Sectional(IL), 2015-05-14(#3) |
| G-400 | 34 | 1:00.46 | Hinds, Jerrie (2016) (Westinghouse Career Academy, IL) | Conant Girls Twilight Invitational(IL), 2015-05-01(#2) |
| G-400 | 35 | 1:00.47 | Chapman, Kiara (2017) (Jersey Comm, IL) | IL 2A Springfield Southeast Girls Sectional(IL), 2015-05-14(#2) |
| G-400 | 36 | 1:00.50 | Anderson, Dominque (2017) (Il Mathematics & Science Academy, IL) | Matt Wulf Invitational(IL), 2015-04-17(#2) |
| G-400 | 37 | 1:00.52 | Layne, Erin (Illinois Valley Central, IL) | IL 2A Dunlap Girls Sectional(IL), 2015-05-15(#4) |
| G-400 | 38 | 1:00.58 | Allen, Sarah (2015) (Bloomington Central Catholic, IL) | IL 2A Clinton Girls Sectional(IL), 2015-05-14(#1) |
| G-400 | 39 | 1:00.65 | Jamrozek, Maddie (2015) (Montini Catholic, IL) | IL 2A Glenbard South Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 40 | 1:00.75 | Shannon, Tess (2018) (Fenwick, IL) | New Trier Lady Trevian Invitational(IL), 2015-05-02(#1) |
| G-400 | 40 | 1:00.75 | Stone, Hannah (2015) (Tolono Unity, IL) | Monticello Lady Sages Invitational(IL), 2015-05-01(#3) |
| G-400 | 42 | 1:00.83 | Watson, Charlicia (2015) (Springfield Southeast, IL) | Springfield Girls City Meet(IL), 2015-04-29(#2) |
| G-400 | 43 | 1:00.90 | White, Zaneta (2015) (Springfield Southeast, IL) | Glenwood Co-Ed Titan Invitational(IL), 2015-04-24(#1) |
| G-400 | 44 | 1:00.99 | Sidaugaite, Vejune (Tinley Park, IL) | IL 2A Kankakee Girls Sectional(IL), 2015-05-14(#3) |
| G-400 | 45 | 1:01.06 | Simmons, Amari (Rich East , IL) | AAU Central District Qualifier(IL), 2015-06-14(#8) |
| G-400 | 46 | 1:01.09 | Love, Yakira (2015) (Westinghouse Career Academy, IL) | Conant Girls Twilight Invitational(IL), 2015-05-01(#4) |
| G-400 | 46 | 1:01.09 | Nieves, Tatiana (2015) (Trinity, IL) | IL 2A Girls State Prelims(IL), 2015-05-22(#18) |
| G-400 | 46 | 1:01.09 | Jackson, Trenice (2015) (Rich East , IL) | Paul Wallace Classic (IL), 2015-01-01(#12) |
| G-400 | 49 | 1:01.13 | Jacobs, Paris (2016) (Cahokia, IL) | Alton Girls Invitational(IL), 2015-04-23(#2) |
| G-400 | 49 | 1:01.13 | Hollie, Brittany (2017) (Rich South, IL) | USATF Youth National Championships 15-16(IL), 2015-07-05(#9) |
| G-400 | 51 | 1:01.14 | Lee, India (2016) (Rich South, IL) | Oswego East Girls Invitational(IL), 2015-04-18(#7) |
| G-400 | 52 | 1:01.17 | Maxey, Baylee (2018) (Mascoutah, IL) | IL 2A Triad Girls Sectional(IL), 2015-05-14(#4) |
| G-400 | 53 | 1:01.20 | Meissner, Faye (2018) (Breese Central, IL) | Cahokia Conference Championships(IL), 2015-05-06(#1) |
| G-400 | 54 | 1:01.31 | Thompson, Sierra (2017) (Mattoon, IL) | Mattoon Girls Invitational(IL), 2015-04-21(#1) |
| G-400 | 54 | 1:01.31 | Parker, Carinne (2017) (Morgan Park, IL) | CPS Girls Varsity Trials(IL), 2015-05-05(#6) |
| G-400 | 56 | 1:01.34 | Guingrich, Ashley (2015) (Notre Dame, IL) | Rock Island Girls ABC Invitational(IL), 2015-04-18(#3) |
| G-400 | 57 | 1:01.38 | Christopher, Sarah (Pontiac, IL) | Roger Washburn Invitational(IL), 2015-05-01(#4) |
| G-400 | 58 | 1:01.46 | Griffin, Hope (2018) (Charleston, IL) | IL 2A Clinton Girls Sectional(IL), 2015-05-14(#2) |
| G-400 | 59 | 1:01.53 | Thompson, Alexandre (University of Chicago Lab School, IL) | Chicago Christian Invitational(IL), 2015-05-01(#1) |
| G-400 | 60 | 1:01.60 | Fry, Chloe (2015) (Glenbard South, IL) | Metro Suburban Girls Quad(IL), 2015-04-28(#1) |
| G-400 | 61 | 1:01.69 | Crawford, Lisa (2016) (Springfield Southeast, IL) | Springfield Girls City Meet(IL), 2015-04-29(#4) |
| G-400 | 62 | 1:01.70 | Martens, Jamie (2018) (Kaneland , IL) | Fricke Girls ABC Invitational(IL), 2015-04-17(#2) |
| G-400 | 63 | 1:01.73 | Barnhart, Megan (2017) (Sterling, IL) | Rock Island Girls ABC Invitational(IL), 2015-04-18(#4) |
| G-400 | 64 | 1:01.78 | Valdez, Alicia (2015) (Charleston, IL) | IL 2A Clinton Girls Sectional(IL), 2015-05-14(#3) |
| G-400 | 65 | 1:01.82 | Collier, Kristen (2017) (Freeburg Community, IL) | Cahokia Conference Championships(IL), 2015-05-06(#2) |
| G-400 | 65 | 1:01.82 | Richter, Abigail (2016) (Triad, IL) | O'Fallon Girls Invitational(IL), 2015-04-17(#2) |
| G-400 | 67 | 1:01.86 | Zacharias, Morgan (2015) (Reed-Custer, IL) | Seneca Irish Invitational(IL), 2015-04-17(#2) |
| G-400 | 68 | 1:01.90 | Smith, Blessed (2017) (Macomb, IL) | PJS Honor Roll Meet(IL), 2015-05-26(#5) |
| G-400 | 68 | 1:01.90 | Katz, Lauren (2018) (Vernon Hills, IL) | USATF Youth National Championships 15-16(IL), 2015-07-05(#14) |
| G-400 | 70 | 1:01.91 | Washington, Deja (2015) (Perspectives Charter, IL) | CPS Girls Varsity Trials(IL), 2015-05-05(#7) |
| G-400 | 71 | 1:01.93 | Green, Atlexus (2018) (Carbondale Comm, IL) | O'Fallon Girls Invitational(IL), 2015-04-17(#3) |
| G-400 | 72 | 1:01.95 | Anderson, Becca (2015) (Clinton, IL) | Bloomington Lady Raider Invitational, 2015-04-17(#8) |
| G-400 | 73 | 1:02.00 | Strike, Heather (2015) (Erie-Prophetstown, IL) | Rockridge Girls Invitational(IL), 2015-04-16(#3) |
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