| Event | Rank | Mark | By | Meet |
| G-400 | 1 | 54.05 | Ellis, Brittny (2015) (Warren Township, IL) (US#22) | Brooks PR Invitational(WA), 2015-06-20(#2) |
| G-400 | 2 | 55.12 | Miller, Samara (2016) (Neuqua Valley, IL) (US#86) | Paul Wallace Classic (IL), 2015-01-01(#1) |
| G-400 | 3 | 55.54 | Wilson, Ashleigh (2015) (Minooka Community, IL) | IL 3A Girls State Finals(IL), 2015-05-23(#2) |
| G-400 | 4 | 55.68 | Harris, Morgan (2016) (Oswego East, IL) | Paul Wallace Classic (IL), 2015-01-01(#2) |
| G-400 | 5 | 55.86 | Griggs, Kierra (2016) (Bloom Township, IL) | IL 3A Girls State Finals(IL), 2015-05-23(#3) |
| | | National Elites above. State Elites below | | |
| G-400 | 6 | 56.59 | Stennis, Charlyncia (2016) (Bolingbrook, IL) | AAU JO Region 13 Qualifier(IL), 2015-07-05(#4) |
| G-400 | 7 | 56.66 | Welch, Kylie (2017) (Bloomington, IL) | USATF Youth National Championships 15-16(IL), 2015-07-05(#2) |
| G-400 | 8 | 56.95 | Hargrave, Tashee (2016) (Neuqua Valley, IL) | USATF JO Region 7 Qualifier(IL), 2015-07-12(#3) |
| G-400 | 9 | 56.98 | Lewis, Dominique (2015) (Centennial, IL) | Bruce Ritter Invitational(IL), 2015-04-17(#1) |
| G-400 | 10 | 57.19 | Rayford, Tamia (2017) (West Aurora, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#2) |
| G-400 | 11 | 57.20 | Basala, Delaney (2016) (Grant Community, IL) | Barrington Girls Invitational(IL), 2015-04-17(#2) |
| G-400 | 12 | 57.34 | Smith, Kameesha (2017) (Thornwood, IL) | IL 3A Girls State Finals(IL), 2015-05-23(#6) |
| G-400 | 13 | 57.47 | Davis, Imani (2016) (Lane Technical, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#7) |
| G-400 | 14 | 57.51 | Cohn, Hannah (2016) (St. Ignatius, IL) | IL 3A St. Ignatius Girls Sectional(IL), 2015-05-14(#1) |
| G-400 | 15 | 57.55 | Hall, Imani (2016) (Danville, IL) | USATF Youth National Championships 17-18(IL), 2015-07-05(#4) |
| G-400 | 16 | 57.60 | Ignoffo, Foster (2016) (Geneva, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 17 | 57.74 | Hackbarth, Michaela (2016) (Downers Grove South, IL) | IL 3A Downers Grove North Girls Sectional(IL), 2015-05-14(#2) |
| G-400 | 18 | 57.78 | Mcnamee, Nijia (2015) (Belleville West, IL) | IL 3A O'Fallon Girls Sectional(IL), 2015-05-15(#1) |
| G-400 | 19 | 57.86 | Coy, Addison (2017) (Barrington, IL) | Mid Suburban League Girls Championships(IL), 2015-05-08(#1) |
| G-400 | 20 | 58.02 | Smyles, Jasmine (2016) (Prosser Career Academy, IL) | IL 3A Girls State Prelims(IL), 2015-05-22(#11) |
| G-400 | 21 | 58.16 | Wallace, Kyndall (2016) (Lincoln-Way East, IL) | SWSC-Blue Girls Conference Meet(IL), 2015-05-07(#2) |
| G-400 | 22 | 58.18 | Stonewall, Chante (2016) (Normal University, IL) | Bloomington/Normal Intercity Classic(IL), 2015-04-28(#1) |
| G-400 | 23 | 58.24 | Brown, Daijah (2018) (Plainfield South, IL) | IL 3A Naperville North Girls Sectional(IL), 2015-05-14(#3) |
| G-400 | 24 | 58.29 | Adducci, Morgan (2015) (Glenbrook North, IL) | IL 3A Girls State Prelims(IL), 2015-05-22(#12) |
| G-400 | 25 | 58.36 | Ayoola, Ololade (2017) (Lincoln-Way East, IL) | Glenbard South Lady Raider Invitational(IL), 2015-04-17(#1) |
| G-400 | 26 | 58.52 | Althoff, Nicky (2016) (Hononegah, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#3) |
| G-400 | 27 | 58.75 | Johnson, Avryl (2018) (Libertyville, IL) | North Suburban Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 28 | 58.79 | Long, Savannah (2016) (DeKalb, IL) | USATF Youth National Championships 17-18(IL), 2015-07-05(#8) |
| G-400 | 29 | 58.83 | McClinton, Kyanna (2018) (St. Charles East, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#5) |
| G-400 | 30 | 58.84 | Iginla, Basirat (2015) (Palatine, IL) | Palatine Relays(IL), 2015-05-02(#1) |
| G-400 | 30 | 58.84 | Schuetz, Rachel (2015) (Downers Grove North, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#1) |
| G-400 | 32 | 58.90 | Bollinger, Skyler (2016) (Yorkville, IL) | Woodstock Girls Invitational(IL), 2015-05-01(#1) |
| G-400 | 33 | 58.97 | Sullivan, Madeline (2016) (Hinsdale Central, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#2) |
| G-400 | 34 | 59.01 | Moravec, Emma (2017) (Downers Grove North, IL) | Bruce Ritter Invitational(IL), 2015-04-17(#3) |
| G-400 | 35 | 59.04 | Thorpe, Kiera (2015) (Highland Park, IL) | IL 3A Loyola Academy Girls Sectional(IL), 2015-05-14(#2) |
| G-400 | 36 | 59.05 | Driver, Briana (2015) (Mother McAuley, IL) | GCAC Championships(IL), 2015-05-09(#2) |
| G-400 | 36 | 59.05 | Mcclendon, Jemya (2017) (West Aurora, IL) | AAU Central District Qualifier(IL), 2015-06-14(#2) |
| G-400 | 38 | 59.08 | Mabien, Kiara (2017) (Warren Township, IL) | North Suburban Girls Conference Meet(IL), 2015-05-07(#4) |
| G-400 | 39 | 59.09 | Flammersfeld, Abby (2018) (Oswego East, IL) | Southwest Prairie Girls Conference Meet(IL), 2015-05-07(#4) |
| G-400 | 40 | 59.10 | Mclaurin, Kelsey (2017) (Barrington, IL) | Barrington Girls Invitational(IL), 2015-04-17(#3) |
| G-400 | 41 | 59.11 | Kieser, Lindsey (2015) (Normal Community West, IL) | Bloomington Honor Roll Meet(IL), 2015-05-26(#2) |
| G-400 | 42 | 59.16 | Letz, Renee (2015) (Carl Sandburg, IL) | SWSC-Blue Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 42 | 59.16 | Elder, Sabrina (2018) (Belvidere North, IL) | IL 3A Hononegah Girls Sectional(IL), 2015-05-14(#1) |
| G-400 | 44 | 59.24 | Smart, Tara (2016) (New Trier Township, IL) | USATF Youth National Championships 17-18(IL), 2015-07-05(#9) |
| G-400 | 45 | 59.26 | Martin, Jezel (2016) (Bloomington, IL) | Bloomington/Normal Intercity Classic(IL), 2015-04-28(#2) |
| G-400 | 46 | 59.29 | Finegan, Nora (2016) (Fremd, IL) | Mid Suburban League Girls Championships(IL), 2015-05-08(#2) |
| G-400 | 47 | 59.34 | Gary, Julia (2017) (Carl Sandburg, IL) | SWSC-Blue Girls Conference Meet(IL), 2015-05-07(#4) |
| G-400 | 48 | 59.39 | O'Brien, Kelly (2016) (Palatine, IL) | MSL-West Girls Divisional Championship(IL), 2015-04-28(#1) |
| G-400 | 48 | 59.39 | Jonke, Audrey (2015) (Batavia, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#6) |
| G-400 | 50 | 59.50 | Petro, Rachel (2016) (Downers Grove South, IL) | Downers Grove South Girls Invitational(IL), 2015-04-11(#1) |
| G-400 | 51 | 59.52 | Dwyer, Dana (2017) (Waubonsie Valley, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#7) |
| G-400 | 52 | 59.62 | Brown, Asia (2016) (Lincoln-Way East, IL) | Homewood-Flossmoor Girls Invitational(IL), 2015-04-11(#3) |
| G-400 | 53 | 59.66 | Suggs, Keina (2016) (Glenbard North, IL) | DuPage Valley Girls Conference Meet(IL), 2015-05-07(#1) |
| G-400 | 54 | 59.68 | Nevins, Mary (2015) (Glenbard West, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#3) |
| G-400 | 55 | 59.71 | Ford, Jade (2018) (Moline, IL) | Rock Island Girls ABC Invitational(IL), 2015-04-18(#1) |
| G-400 | 55 | 59.71 | Cossio, Anna (2016) (Barrington, IL) | Palatine Relays(IL), 2015-05-02(#3) |
| G-400 | 57 | 59.74 | Pettgrew, Abriana (2015) (Auburn, IL) | IL 3A Hononegah Girls Sectional(IL), 2015-05-14(#3) |
| G-400 | 58 | 59.82 | Robinson, Talia (2018) (Proviso West, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#4) |
| G-400 | 59 | 59.87 | Miller, Tess (2015) (Huntley, IL) | Fox Valley Girls Conference Meet(IL), 2015-05-07(#1) |
| G-400 | 60 | 1:00.03 | Pointer, Robyn (2017) (Granite City, IL) | O'Fallon Girls Invitational(IL), 2015-04-17(#1) |
| G-400 | 61 | 1:00.05 | Allie, Saffilla (2018) (Naperville North, IL) | Gus Scott Co-Ed Invitational(IL), 2015-04-17(#1) |
| G-400 | 61 | 1:00.05 | Mendoza, Jocelyne (2015) (Taft, IL) | Conant Girls Twilight Invitational(IL), 2015-05-01(#2) |
| G-400 | 63 | 1:00.14 | Hoel, Kailey (2016) (Hinsdale South, IL) | WSC-Gold Girls Conference Meet(IL), 2015-05-07(#2) |
| G-400 | 63 | 1:00.14 | Lussier, Lucy (2016) (Lyons Township, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#4) |
| G-400 | 65 | 1:00.21 | Shepard, Jamiah (2015) (Thornwood, IL) | Lincoln-Way C Lady Knights Invitational(IL), 2015-04-11(#1) |
| G-400 | 66 | 1:00.25 | O'Malley, Sara (2016) (Grayslake Central, IL) | IL 3A Fremd Girls Sectional(IL), 2015-05-15(#3) |
| G-400 | 67 | 1:00.27 | Stiver, Reilly (2016) (Springfield, IL) | Southeast Spartan Girls Invitational(IL), 2015-04-11(#4) |
| G-400 | 68 | 1:00.28 | Broughton, Antoinette (2015) (Homewood-Flossmoor, IL) | Lockport Girls Invitational(IL), 2015-04-24(#5) |
| G-400 | 69 | 1:00.39 | Williams, Kanosha (2018) (Danville, IL) | News-Gazette Honor Roll Meet(IL), 2015-05-18(#4) |
| G-400 | 70 | 1:00.40 | Karwiec, Edyta (2015) (Hoffman Estates, IL) | Conant Girls Twilight Invitational(IL), 2015-05-01(#1) |
| G-400 | 70 | 1:00.40 | Piotrowski, Julia (2018) (Barrington, IL) | IL 3A Fremd Girls Sectional(IL), 2015-05-15(#4) |
| G-400 | 72 | 1:00.42 | Isom, Kayla (2017) (Lockport Township , IL) | Lockport Girls Invitational(IL), 2015-04-24(#6) |
| G-400 | 73 | 1:00.43 | Bibbs, Janese (2015) (South Elgin, IL) | IL 3A St. Charles North Girls Sectional(IL), 2015-05-15(#3) |
| G-400 | 74 | 1:00.47 | Platzbecker, Emma (2016) (Harlem, IL) | Woodstock Girls Invitational(IL), 2015-05-01(#4) |
| G-400 | 74 | 1:00.47 | Winters, Aaliyah (2015) (Streamwood, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#8) |
| G-400 | 76 | 1:00.57 | Ramirez, Sullibet (2015) (Bloom Township, IL) | Lockport Girls Invitational(IL), 2015-04-24(#7) |
| G-400 | 77 | 1:00.58 | Marshall, Brea (2018) (Collinsville, IL) | Southwest Conference Girls Meet(IL), 2015-05-06(#1) |
| G-400 | 77 | 1:00.58 | Ortiz, Tori (2018) (Batavia, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#9) |
| G-400 | 79 | 1:00.60 | Leever, Kristen (2017) (Bartlett, IL) | Barrington Girls Invitational(IL), 2015-04-17(#6) |
| G-400 | 80 | 1:00.61 | Reese, Taliah (2017) (O'Fallon, IL) | IL 3A O'Fallon Girls Sectional(IL), 2015-05-15(#3) |
| G-400 | 81 | 1:00.69 | Hughes, Brion (2016) (Waubonsie Valley, IL) | Gus Scott Co-Ed Invitational(IL), 2015-04-17(#2) |
| G-400 | 82 | 1:00.72 | Cashdollar, Lorie (2018) (Edwardsville, IL) | Southwest Conference Girls Meet(IL), 2015-05-06(#2) |
| G-400 | 82 | 1:00.72 | Freeman, Achante (2017) (Plainfield Central, IL) | Southwest Prairie Girls Conference Meet(IL), 2015-05-07(#5) |
| G-400 | 84 | 1:00.76 | Siddiqui, Roma (2016) (Niles West, IL) | IL 3A Loyola Academy Girls Sectional(IL), 2015-05-14(#4) |
| G-400 | 85 | 1:00.90 | Webster, Kyra (2016) (Springfield, IL) | Springfield Girls City Meet(IL), 2015-04-29(#3) |
| G-400 | 85 | 1:00.90 | Benson, Valencia (2016) (Thornton Township, IL) | IL 3A Homewood-Flossmoor Girls Sectional(IL), 2015-05-14(#4) |
| G-400 | 87 | 1:00.97 | Ballard, Kaira (2016) (Lincoln-Way North, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#19) |
| G-400 | 88 | 1:00.99 | Strohaker, Kathleen (2017) (St. Charles East, IL) | IL 3A St. Charles North Girls Sectional(IL), 2015-05-15(#6) |
| G-400 | 89 | 1:01.01 | Fisher, Cameryn (2018) (Proviso West, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#5) |
| G-400 | 89 | 1:01.01 | Woods, Garesia (2017) (Bloom Township, IL) | AAU JO Region 13 Qualifier(IL), 2015-07-05(#5) |
| G-400 | 91 | 1:01.05 | Wells, Kennedy (2017) (South Elgin, IL) | IL 3A St. Charles North Girls Sectional(IL), 2015-05-15(#7) |
| G-400 | 92 | 1:01.07 | Milburn, Emma (2018) (Lake Forest, IL) | Paul Wallace Classic (IL), 2015-01-01(#4) |
| G-400 | 93 | 1:01.10 | Nottke, Beatrice (2016) (Wheaton North, IL) | DuPage Valley Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 94 | 1:01.11 | Allen, Brittney (2016) (Thornwood, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#21) |
| G-400 | 95 | 1:01.19 | Scales, Jaylyn (2018) (Homewood-Flossmoor, IL) | AAU JO Region 13 Qualifier(IL), 2015-07-05(#6) |
| G-400 | 96 | 1:01.20 | Bonney, Katie (2017) (Hoffman Estates, IL) | Barrington Girls Invitational(IL), 2015-04-17(#7) |
| G-400 | 96 | 1:01.20 | Hoover, Mariah (2016) (Rock Island, IL) | Western Big Six Girls Conference Meet(IL), 2015-05-09(#2) |
| G-400 | 98 | 1:01.23 | Johnson, Deandra (Crete-Monee, IL) | IL 3A Homewood-Flossmoor Girls Sectional(IL), 2015-05-14(#5) |
| G-400 | 99 | 1:01.32 | Williams, Adrianna (2017) (Centennial, IL) | USATF IL Assc JO Championships(IL), 2015-06-28(#6) |
| G-400 | 100 | 1:01.39 | Erewele, Ozzie (2018) (Springfield, IL) | Capital City Girls F/S Classic(IL), 2015-04-07(#1) |
| G-400 | 100 | 1:01.39 | Sirvinskas, Julia (2016) (Maine South, IL) | CSL-South Girls Conference Meet(IL), 2015-05-07(#2) |
| G-400 | 100 | 1:01.39 | Bently, Grace (2018) (Lake Forest, IL) | USATF Youth National Championships 15-16(IL), 2015-07-05(#13) |
| G-400 | 103 | 1:01.40 | Rabs, Rebecca (2016) (Buffalo Grove, IL) | IL 3A Fremd Girls Sectional(IL), 2015-05-15(#5) |
| G-400 | 104 | 1:01.45 | Bohannon, Danielle (2015) (Edwardsville, IL) | Madison County Championships(IL), 2015-04-28(#1) |
| G-400 | 105 | 1:01.51 | Minogue, Brandie (2016) (Crystal Lake South, IL) | Fox Valley Girls Conference Meet(IL), 2015-05-07(#2) |
| G-400 | 106 | 1:01.53 | Schwartz, Caily (2015) (York Community, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#6) |
| G-400 | 107 | 1:01.54 | Sluman, Kathryn (2016) (Hinsdale Central, IL) | WSC-Silver Girls Conference Meet(IL), 2015-05-09(#7) |
| G-400 | 108 | 1:01.56 | Gowgiel, Madeline (2015) (Carl Sandburg, IL) | Sandburg Girls Eagle Classic(IL), 2015-04-23(#3) |
| G-400 | 108 | 1:01.56 | Edmondson, Darby (2017) (Batavia, IL) | Kane County Girls Championships(IL), 2015-04-30(#7) |
| G-400 | 110 | 1:01.58 | Jimenez, Isabella (2016) (Homewood-Flossmoor, IL) | SWSC-Blue Girls Conference Meet(IL), 2015-05-07(#6) |
| G-400 | 111 | 1:01.60 | Gowgiel, Maddie (2015) (Carl Sandburg, IL) | Falcon Blue & Gold Invitational(IL), 2015-04-17(#3) |
| G-400 | 112 | 1:01.61 | Centeno, Maggy (2018) (Schaumburg, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#8) |
| G-400 | 113 | 1:01.62 | Rhines, Ronisha (2016) (East St. Louis-Senior, IL) | St. Clair County Girls Championships(IL), 2015-04-29(#4) |
| G-400 | 114 | 1:01.64 | Ishamuddin, Sarah (2017) (Grayslake Central, IL) | Fox Valley Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 114 | 1:01.64 | Snyder, Sydney (2017) (Moline, IL) | IL 3A O'Fallon Girls Sectional(IL), 2015-05-15(#7) |
| G-400 | 116 | 1:01.67 | Banuelos, Lynette (2016) (Addison Trail, IL) | Palatine Relays(IL), 2015-05-02(#5) |
| G-400 | 117 | 1:01.69 | Zimmer, Nikki (2015) (Elgin, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#11) |
| G-400 | 118 | 1:01.70 | Jackson, Sophia (2018) (St. Charles East, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#12) |
| G-400 | 119 | 1:01.72 | Pola, Nadine (Schaumburg, IL) | IL 3A St. Charles North Girls Sectional(IL), 2015-05-15(#8) |
| G-400 | 120 | 1:01.74 | Schackelton, Valarie (2017) (Schaumburg, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#10) |
| G-400 | 121 | 1:01.77 | Mendez, Cindy (2016) (West Chicago, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#13) |
| G-400 | 121 | 1:01.77 | Meyers, Katrina (2017) (Hononegah, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#11) |
| G-400 | 123 | 1:01.79 | Schlebecker, Megan (Mundelein Cons, IL) | North Suburban Girls Conference Meet(IL), 2015-05-07(#6) |
| G-400 | 124 | 1:01.80 | Mickens, Aliyah (2017) (Homewood-Flossmoor, IL) | Rock Island Girls ABC Invitational(IL), 2015-04-18(#5) |
| G-400 | 125 | 1:01.81 | Beine, Mary (2015) (Downers Grove South, IL) | WWS Girls Tiger Invitational(IL), 2015-05-01(#12) |
| G-400 | 125 | 1:01.81 | Kroll, Lauren (2017) (Addison Trail, IL) | DuPage Track Invitational(IL), 2015-07-18(#2) |
| G-400 | 125 | 1:01.81 | Jachimiec, Grace (2016) (Metea Valley, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#15) |
| G-400 | 128 | 1:01.83 | Hernandez, Nicki (2017) (Metea Valley, IL) | Upstate Eight Girls Conference Meet(IL), 2015-05-07(#16) |
| G-400 | 129 | 1:01.90 | Bryja, Ashley (2017) (Mother McAuley, IL) | Lincoln-Way C Lady Knights Invitational(IL), 2015-04-11(#3) |
| G-400 | 130 | 1:01.92 | Biegalski, Cailyn (2018) (Glenbard East, IL) | Glenbard East Girls Rams Invitational(IL), 2015-04-24(#1) |
| G-400 | 130 | 1:01.92 | Dunah, Kardia (Oswego, IL) | AAU JO Region 13 Qualifier(IL), 2015-07-05(#8) |
| G-400 | 132 | 1:01.93 | Perrin, Lilian (2015) (Niles North, IL) | CSL-North Girls Conference Meet(IL), 2015-05-07(#3) |
| G-400 | 133 | 1:01.94 | Cropsey, Lauren (2015) (Barrington, IL) | Homewood-Flossmoor Girls Invitational(IL), 2015-04-11(#1) |
| G-400 | 133 | 1:01.94 | Laudizio, Anna (2016) (Plainfield North, IL) | Jane Dickens Invitational(IL), 2015-06-20(#9) |
| G-400 | 135 | 1:01.97 | Kelly, Kniyah (Bloomington, IL) | Bloomington Honor Roll Meet(IL), 2015-05-26(#4) |
| G-400 | 135 | 1:01.97 | Yakesh, Jenna (2017) (Oswego, IL) | IL 3A Naperville North Girls Sectional(IL), 2015-05-14(#8) |
| G-400 | 135 | 1:01.97 | Lopez, Gianna (2018) (Lemont, IL) | IL 3A Downers Grove North Girls Sectional(IL), 2015-05-14(#6) |
| G-400 | 138 | 1:02.00 | Terry, Erica (2015) (Lakes, IL) | D117 Girls Invitational(IL), 2015-04-23(#1) |
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