| Name | Time | Date | Meet |
|---|---|---|---|
| Clare Lawlor | 50.92 | Nov. 20, 2015 | 2015 Illinois Girls State Championships |
| Clare Lawlor | 51.08 | Nov. 14, 2015 | 2015 Illinois Girls Sectional Championships - Lockport |
| Clare Lawlor | 51.27 | Nov. 21, 2014 | 2014-15 Illinois Girls State Championships |
| Clare Lawlor | 51.86 | Nov. 16, 2013 | 2013-14 Illinois Girls High School Best Times |
| Tara Capouch | 52.79 | Nov. 19, 2010 | 2010 Illinois Girls State Championships |
| Michelle Kuyper | 54.64 | Nov. 21, 2008 | 2009 Illinois Girls State Championships |
