| Time | Date | Name | Meet |
|---|---|---|---|
| 56.34 | Aug. 2, 2014 | Patrick Mulcare | Speedo Junior National Championsips |
| 56.76 | July 19, 2014 | Patrick Mulcare | Speedo Champions Series - Mount Hood |
| 57.29 | Aug. 16, 2012 | Aaron Young | Speedo Junior National Championships (LCM) |
| 57.78 | Aug. 13, 2009 | Connor McCarroll | Speedo Junior National Championships |
| 58.70 | Aug. 1, 2008 | Connor McCarroll | U. S. Open - Time Trials |
| 59.88 | Dec. 2, 2007 | Connor McCarroll | USA Swimming Championships |
| 59.96 | Aug. 10, 2007 | Connor McCarroll | Speedo Junior National Championships |
| 1:00.26 | Aug. 9, 2007 | Connor McCarroll | Speedo Junior National Championships |
| 1:00.31 | Aug. 2, 2007 | Morgon Henderson-Kunz | ConocoPhillips USA Swimming Time Trials |
| 1:01.58 | May 27, 2007 | Connor McCarroll | CA NOVA Speedo Grand Challenge |
| 1:02.66 | Aug. 11, 2006 | Connor McCarroll | USA Swimming Junior National Championships |
| 1:03.30 | Aug. 10, 2006 | Matthew Grimes | USA Swimming Junior National Championships |
| 1:07.81 | July 31, 2003 | Matt Morton | PC WEST Far West Championships |
