| Final | time | ____________________ | | 1. |  United States | 48.7s | | | Dolores Dwyer,Janet Moreau, Nell Jackson,Jean Patton | | 2. |  Chile | 49.3s | | | Eliana Gaete Lazo,Beatriz Kretschmer de Buccicardi, Hildegard Kreft,Adriana Millard Pacheco | | 3. |  Argentina | 49.8s | | | Ana Maria Fontán,Olga Bianchi, Teresa Carvajal, Lilian Heinz. res: Cora Pascasio, Oldemia Bargiela de Martin | | 4. |  Brazil | 50.5s | | | Helena Cardoso de Menezes,Deyse Jurdelina de Castro, Wanda dos Santos, Elisabeth Clara Muller | | 5. |  Ecuador | 53.3s | | | Carmen Matos Garcia,Leonor Estévez Bucheli, Aida Mawyn Cedeno, Jacinta Sandiford |
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