Nakano is a special ward in the Tokyo Metropolis in Japan. The English translation of its Japanese self-designation is Nakano City. As of Jan…Nakano is a special ward in the Tokyo Metropolis in Japan. The English translation of its Japanese self-designation is Nakano City. As of January 1, 2024, the ward has an estimated population of 337,377, and a population density of 21,640 persons per km². The total area is 15.59 km². Nakano is the most densely populated city in Japan.