| Lane |
Swimmer |
Team |
Place |
Time |
| 2 |
Margarita Ryan |
Rockville Montgomery Swim Club |
2 |
18:22.18 |
| 3 |
Elaina Gu |
Rockville Montgomery Swim Club |
1 |
17:25.08 |
| 4 |
Ellie Sherman |
Rockville Montgomery Swim Club |
3 |
18:25.17 |
| 5 |
Lynn Zhang |
Rockville Montgomery Swim Club |
4 |
18:32.83 |