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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 48.77 | Aug. 6, 2014 | Michael Phelps | North Baltimore Aquatic Club | Phillips 66 Summer National Championships |
| 48.80 | June 20, 2014 | Michael Phelps | North Baltimore Aquatic Club | Arena Grand Prix at Santa Clara |
| 49.05 | Feb. 10, 2004 | Michael Phelps | North Baltimore Aquatic Club | ConocoPhillips Spring National Championships |
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