| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:10.11 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Backstroke | 1:08.12 | Border City Invitational 2025 | 2025-12-05 |
| 100m Breaststroke | 1:29.35 | 2025 NYAC Cup | 2025-11-14 |
| 100m Butterfly | 1:22.53 | BAD Outdoor LC Invitational | 2025-06-20 |
| 100m Freestyle | 1:01.41 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Freestyle | 59.87 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m IM | 1:14.20 | MAC Fall Fest Invitational | 2025-10-18 |
| 200m Freestyle | 2:20.54 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 200m Freestyle | 2:15.50 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m IM | 2:47.93 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 400m Freestyle | 5:00.05 | RHAC Winter Invitational 2026 | 2026-01-16 |
| 400m Freestyle | 4:43.23 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Backstroke | 31.30 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Backstroke | 30.97 | Border City Invitational 2025 | 2025-12-05 |
| 50m Butterfly | 29.55 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Freestyle | 27.11 | MAC Winter Invitational | 2026-01-22 |
| 50m Freestyle | 27.00 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
McMillan, Jack's top personal bests include 100m Backstroke (1:10.11), 100m Backstroke (1:08.12), 100m Breaststroke (1:29.35), 100m Butterfly (1:22.53), 100m Freestyle (1:01.41).
McMillan, Jack swims for Toronto Olympian Swim Team.
McMillan, Jack has competed in 9 meets.