Chūō is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as Chūō City. It was formed in 1947 as a merger o…Chūō is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as Chūō City. It was formed in 1947 as a merger of Kyōbashi and Nihonbashi wards following Tokyo City's transformation into Tokyo Metropolis.