| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 58.75 | 2025 NYAC Cup | 2025-11-14 |
| 100m Butterfly | 58.87 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 100m Freestyle | 55.10 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 100m IM | 1:05.64 | NEOR 2 2026 | 2026-01-24 |
| 200m Backstroke | 2:08.86 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 200m Butterfly | 2:28.09 | 2025-2026 SSAT Invitational - NEOR 1 | 2025-10-25 |
| 200m Freestyle | 2:09.01 | 2025 NYAC Cup | 2025-11-14 |
| 200m IM | 2:29.03 | NCA Fall In Club Meet | 2025-10-29 |
| 50m Backstroke | 27.64 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Butterfly | 26.43 | 2025 NYAC Cup | 2025-11-14 |
| 50m Freestyle | 25.71 | 2025 Murray Drudge Invitational | 2025-12-05 |
Mongeon, James's top personal bests include 100m Backstroke (58.75), 100m Butterfly (58.87), 100m Freestyle (55.10), 100m IM (1:05.64), 200m Backstroke (2:08.86).
Mongeon, James swims for Nickel City Aquatics.
Mongeon, James has competed in 9 meets.