Sister cities

Twinned with Callao

7 of 25 in this atlas

Callao maintains formal twinning ties with seven municipalities recorded in this atlas, all confirmed as mutual. The pairings lean heavily toward East Asia, with three Chinese cities—Ningbo, Qingdao, Quanzhou, and Zhuhai—joined by Nagoya and Yokohama in Japan. Panama City stands as the sole Latin American counterpart. Each relationship is declared and reciprocated on both sides, with no one-sided entries appearing in this set.