| Final 20:20 | Team | time | L | Q | React. | Birth | | 1. Nickiesha Wilson | JAM | 55.40s | 6 | 1. | 0.301 | 28 Jul 1986 | | 2. Zudikey Rodriguez | MEX | 55.54s | 4 | 2. | 0.321 | 14 Mar 1987 | | 3. Janeil Belleile | TRI | 56.81s | 5 | 3. | 0.366 | 16 Jun 1989 | | 4. Yolanda Osana | DOM | 57.73s | 3 | 4. | 0.291 | 11 Aug 1987 | | 5. Nikita Tracey | JAM | 58.54s | 7 | 5. | 0.269 | 18 Sep 1990 | | 6. Sharolyns Scott | CRC | 58.89s | 8 | 6. | 0.313 | 27 Dec 1984 | | 7. Karla Duenas | MEX | 58.94s | 1 | 7. | 0.545 | 31 Mar 1989 | | 8. Kathyenid Rivera | PUR | 59.29s | 2 | 8. | 0.227 | 21 Oct 1989 |
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| Heats. Monday 26.07. First 3 and Best 2 progress. |
| Heat 1 19:00 | Team | time | L | Rk. | Birth | | 1. Nickiesha Wilson | JAM | 56.98s | 6 | 1. | 28 Jul 1986 | | 2. Janeil Belleile | TRI | 58.11s | 3 | 3. | 16 Jun 1989 | | 3. Sharolyns Scott | CRC | 59.05s | 7 | 6. | 27 Dec 1984 | | 4. Karla Duenas | MEX | 59.16s | 5 | 7. | 31 Mar 1989 | | -. Michelle Cumberbatch | BAH | DNS | 4 | | 20 Sep 1988 |
| Heat 2 19:05 | Team | time | L | Rk. | Birth | | 1. Zudikey Rodriguez | MEX | 57.37s | 3 | 2. | 14 Mar 1987 | | 2. Yolanda Osana | DOM | 58.14s | 4 | 4. | 11 Aug 1987 | | 3. Nikita Tracey | JAM | 58.58s | 6 | 5. | 18 Sep 1990 | | 4. Kathyenid Rivera | PUR | 1:00.52 | 5 | 8. | 21 Oct 1989 | | 5. Jessica Aguilera | NCA | 1:05.54 | 7 | 9. | 26 Jun 1985 |
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