| Final | time | | L | _______ | | 1. Cuba | 3:27.51 | | | Aymée Martínez, Daimí Pernía, Zulia Calatayud, Indira Terrero | | 2. Mexico | 3:27.75 | NR | | María Teresa Rugerio, Gabriela Medina, Zudikey Rodríguez, Ana Guevara | | 3. United States | 3:27.84 | | | Debbie Dunn, Angel Perkins, Latonia Wilson, Nicole Leach | | 4. Jamaica | 3:28.74 | | | Ronetta Smith, Shereefa Lloyd, Anastasia Le-Roy, Davita Prendergast | | 5. Brazil | 3:28.89 | | | Maria Laura Almirão, Emmily Pinheiro, Lucimar Teodoro, Josiane Tito | | 6. Canada | 3:32.37 | | | Adrienne Power, Esther Akinsulie, Carline Muir, Diane Cummins | | 7. Trinidad Tobago | 3:39.67 | | | Janeil Bellille, Natalie Dixon, Melissa de Leon, Romona Modeste | | 8. Ecuador | 3:43.88 | | | Yessica Perea, Lucy Jaramillo, Paola Sánchez, Erika Chávez |
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