High Quality Content by WIKIPEDIA articles! The Columbus Zoo and Aquarium is a non-profit zoo located in Powell, Ohio (Liberty Township/Delaware County), just north of Columbus. The land lies along the eastern banks of the O`Shaughnessy Reservoir on the Scioto River, at the intersection of Riverside Drive and Powell Road. It has a worldwide reputation, largely attributable to the efforts and promotion of director emeritus Jack Hanna. In 2009, it was named by the USA Travel Guide as the number one zoo in the United States.