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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 50.22 | July 9, 2009 | Michael Phelps | North Baltimore Aquatic Club | ConocoPhillips National Championships |
| 51.84 | Feb. 10, 2004 | Michael Phelps | North Baltimore Aquatic Club | ConocoPhillips Spring National Championships |
| 51.89 | April 1, 2003 | Michael Phelps | North Baltimore Aquatic Club | ConocoPhillips National Championships |
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