| Competition | 1991 Pan Pacific Swimming Championships | 
|---|---|
| Venue | 
Edmonton
 | 
| Held | 23 August 1991 | 
| Status | Medal | 
| Competitors | 25 | 
| Countries | 8 | 
| Pos | Athlete(s) | Country | Preliminary Round | Final | ||
|---|---|---|---|---|---|---|
| 🥇 | Angel Martino | 55.14 (1 h1)  | 
55.34 (1 FA)  | 
|||
| 🥈 | Nicole Haislett | 55.49 (2 h1)  | 
55.63 (2 FA)  | 
|||
| 🥉 | Susie O'Neill | 56.99 (8 h1)  | 
56.12 (3 FA)  | 
|||
| 4 | Suzu Chiba | 57.08 (9 h1)  | 
56.41 (4 FA)  | 
|||
| 5 | Zhuang Yong | 56.63 (4 h1)  | 
56.53 (5 FA)  | 
|||
| 6 | Ayako Nakano | 57.17 (10 h1)  | 
56.78 (6 FA)  | 
|||
| 7 | Toni Jeffs | 57.68 (15 h1)  | 
57.77 (7 FA)  | 
|||
| 8 | Lise Mackie | 57.64 (14 h1)  | 
58.00 (8 FA)  | 
|||
| 9 | Jenny Thompson | 56.49 (3 h1)  | 
56.09 (1 FB)  | 
|||
| 10 | Yoko Koikawa | 57.31 (12 h1)  | 
57.62 (2 FB)  | 
|||
| 11 | Andrea Nugent | 57.97 (16 h1)  | 
57.77 (3 FB)  | 
|||
| 12 | Edith Lachapelle | 58.25 (18 h1)  | 
58.06 (4 FB)  | 
|||
| 13 | Karen Van Wirdum | 58.23 (17 h1)  | 
58.24 (5 FB)  | 
|||
| 14 | Hen Xiaoyun | 58.57 (20 h1)  | 
58.53 (6 FB)  | 
|||
| 15 | Lee Eun-Ju | 59.74 (24 h1)  | 
59.43 (7 FB)  | 
|||
| 16 | Kao Chi-Chuan | 1:02.64 (25 h1)  | 
1:02.99 (8 FB)  | 
|||
| 17 | Whitney Hedgepeth | 56.89 (5 h1)  | 
— | |||
| =18 | Crissy Ahmann-Leighton | 56.93 (=6 h1)  | 
— | |||
| =18 | Sarah Anderson | 56.93 (=6 h1)  | 
— | |||
| 20 | Janel Jorgensen | 57.29 (11 h1)  | 
— | |||
| 21 | Leigh Ann Fetter | 57.61 (13 h1)  | 
— | |||
| 22 | Julie Howard | 58.51 (19 h1)  | 
— | |||
| 23 | Patricia Levesque | 58.62 (21 h1)  | 
— | |||
| 24 | Marianne Limpert | 58.80 (22 h1)  | 
— | |||
| 25 | Petrina Lessard | 58.86 (23 h1)  | 
— | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Angel Martino | 55.14 | ||
| 2 | Nicole Haislett | 55.49 | ||
| 3 | Jenny Thompson | 56.49 | ||
| 4 | Zhuang Yong | 56.63 | ||
| 5 | Whitney Hedgepeth | 56.89 | ||
| =6 | Sarah Anderson | 56.93 | ||
| =6 | Crissy Ahmann-Leighton | 56.93 | ||
| 8 | Susie O'Neill | 56.99 | ||
| 9 | Suzu Chiba | 57.08 | ||
| 10 | Ayako Nakano | 57.17 | ||
| 11 | Janel Jorgensen | 57.29 | ||
| 12 | Yoko Koikawa | 57.31 | ||
| 13 | Leigh Ann Fetter | 57.61 | ||
| 14 | Lise Mackie | 57.64 | ||
| 15 | Toni Jeffs | 57.68 | ||
| 16 | Andrea Nugent | 57.97 | ||
| 17 | Karen Van Wirdum | 58.23 | ||
| 18 | Edith Lachapelle | 58.25 | ||
| 19 | Julie Howard | 58.51 | ||
| 20 | Hen Xiaoyun | 58.57 | ||
| 21 | Patricia Levesque | 58.62 | ||
| 22 | Marianne Limpert | 58.80 | ||
| 23 | Petrina Lessard | 58.86 | ||
| 24 | Lee Eun-Ju | 59.74 | ||
| 25 | Kao Chi-Chuan | 1:02.64 | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Angel Martino | 55.34 | ||
| 2 | Nicole Haislett | 55.63 | ||
| 3 | Susie O'Neill | 56.12 | ||
| 4 | Suzu Chiba | 56.41 | ||
| 5 | Zhuang Yong | 56.53 | ||
| 6 | Ayako Nakano | 56.78 | ||
| 7 | Toni Jeffs | 57.77 | ||
| 8 | Lise Mackie | 58.00 | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Jenny Thompson | 56.09 | ||
| 2 | Yoko Koikawa | 57.62 | ||
| 3 | Andrea Nugent | 57.77 | ||
| 4 | Edith Lachapelle | 58.06 | ||
| 5 | Karen Van Wirdum | 58.24 | ||
| 6 | Hen Xiaoyun | 58.53 | ||
| 7 | Lee Eun-Ju | 59.43 | ||
| 8 | Kao Chi-Chuan | 1:02.99 |