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Midori-ku (緑区, Midori-ku) is one of the 16 wards of the city of Nagoya in Aichi Prefecture, Japan. As of 1 October 2019, the ward had an estimated population of 247,475 and a population density of 6,528 persons per km2. The total area was 37.91 km2. It is the largest of the wards of Nagoya in terms of population.