Bronx Zoo - Free Admission Wednesdays INFO below. The Bronx Zoo is a zoo located within Bronx Park in the Bronx, a borough of New York City. It is the largest metropolitan zoo in the United States and among the largest in the world. The Bronx Zoo is world-renowned for its large and diverse animal collection, and its award-winning exhibitions. The zoo is part of an integrated system of four zoos and one aquarium managed by the Wildlife Conservation Society (WCS), and it is accredited by the Association of Zoos and Aquariums (AZA). More Info below.