Al Japó, un ku (区), traduït com a districte urbà, és una divisió bàsica en una ciutat, sempre per damunt dels chōchō o barris.“Statistical Handbook of Japan 2008” by Statistics Bureau, Japan Chapter 17: Government System (Retrieved on July 4, 2009) E Els barris subdivideixen cada ciutat per decret governamental, i també Tòquio, que està dividit en 23 barris especials. Cada un dels barris especials de Tòquio manté un estat quasi municipal.
Els barris del Japó (fora de Tòquio) són entitats locals directament controlades pel govern municipal. Gestionen funcions administratives com el registre koseki, l'assegurança mèdica i les taxes de propietat. Molts barris tenen organitzacions de residents afiliades per diverses activitats, tot i no tenir aquestes cap autoritat legal.
Llista de districtes miniatura|Mapa de les ciutats japoneses dividides en districtes
Ku en japonès Ciutat Area (km²)Chūō Chiba 44.69Hanamigawa Chiba 34.19Inage Chiba 21.22Midori Chiba 66.25Mihama Chiba 21.20Wakaba Chiba 84.21Chūō Fukuoka 15.39Hakata Fukuoka 31.62Higashi Fukuoka 69.36Jōnan Fukuoka 15.99Minami Fukuoka 30.98Sawara Fukuoka 95.87Nishi Fukuoka 84.16Chūō Hamamatsu 268.42 Hamana Hamamatsu 345.85Tenryū Hamamatsu 943.85Aki Hiroshima 94.08Asakita Hiroshima 353.33Asaminami Hiroshima 117.24Higashi Hiroshima 39.42Minami Hiroshima 26.30Naka Hiroshima 15.32Nishi Hiroshima 35.61Saeki Hiroshima 225.22Asao Kawasaki 23.25Kawasaki Kawasaki 39.53Miyamae Kawasaki 18.61Nakahara Kawasaki 14.74Saiwai Kawasaki 10.01Takatsu Kawasaki 16.36Tama Kawasaki 20.50Kokurakita Kitakyushu 39.23Kokuraminami Kitakyushu 171.74Moji Kitakyushu 73.67Tobata Kitakyushu 16.61Wakamatsu Kitakyushu 71.31Yahatahigashi Kitakyushu 36.26Yahatanishi Kitakyushu 83.13Chūō Kobe 28.97Higashinada Kobe 34.02Hyōgo Kobe 14.68Kita Kobe 240.29Nada Kobe 32.66Nagata Kobe 11.36Nishi Kobe 138.01Suma Kobe 28.93Tarumi Kobe 28.11Chūō Kumamoto 25.45Higashi Kumamoto 50.19Kita Kumamoto 115.34Minami Kumamoto 110.01Nishi Kumamoto 89.33Fushimi Kyoto 61.66Higashiyama Kyoto 7.48Kamigyō Kyoto 7.03Kita Kyoto 94.88Minami Kyoto 15.81Nakagyō Kyoto 7.41Nishikyō Kyoto 59.24Sakyō Kyoto 246.77Shimogyō Kyoto 6.78Ukyō Kyoto 292.07Yamashina Kyoto 28.70Atsuta Nagoya 8.20Chikusa Nagoya 18.18Higashi Nagoya 7.71Kita Nagoya 17.53Meitō Nagoya 19.45Midori Nagoya 37.91Minami Nagoya 18.46Minato Nagoya 45.63Mizuho Nagoya 11.22Moriyama Nagoya 34.01Naka Nagoya 9.38Nakagawa Nagoya 32.02Nakamura Nagoya 16.30Nishi Nagoya 17.93Shōwa Nagoya 10.94Tenpaku Nagoya 21.58Akiha Niigata 95.38Chūō Niigata 37.75Higashi Niigata 38.62Kita Niigata 107.72Kōnan Niigata 75.42Minami Niigata 100.91Nishi Niigata 94.09Nishikan Niigata 176.55Higashi Okayama 160.53Kita Okayama 450.70Minami Okayama 127.48Naka Okayama 51.25Abeno Osaka 5.98Asahi Osaka 6.32Chūō Osaka 8.87Fukushima Osaka 4.67Higashinari Osaka 4.54Higashisumiyoshi Osaka 9.75Higashiyodogawa Osaka 13.27Hirano Osaka 15.28Ikuno Osaka 8.37Joto Osaka 8.38Kita Osaka 10.34Konohana Osaka 19.25Minato Osaka 7.86Miyakojima Osaka 6.08Naniwa Osaka 4.39Nishi Osaka 5.21Nishinari Osaka 7.37Nishiyodogawa Osaka 14.22Suminoe Osaka 20.61Sumiyoshi Osaka 9.40Taishō Osaka 9.43Tennōji Osaka 4.84Tsurumi Osaka 8.17Yodogawa Osaka 12.64Chūō Sagamihara 36.87Midori Sagamihara 253.68Minami Sagamihara 38.11Chūō Saitama 8.39Iwatsuki Saitama 49.17Kita Saitama 16.86Midori Saitama 26.44Minami Saitama 13.82Minuma Saitama 30.69Nishi Saitama 29.12Omiya Saitama 12.80Sakura Saitama 18.64Urawa Saitama 11.51Higashi Sakai 10.49Kita Sakai 15.60Mihara Sakai 13.20Minami Sakai 40.39Naka Sakai 17.88Nishi Sakai 28.61Sakai Sakai 23.65Atsubetsu Sapporo 24.38Chūō Sapporo 46.42Higashi Sapporo 56.97Kita Sapporo 63.57Kiyota Sapporo 59.87Minami Sapporo 657.48Nishi Sapporo 75.10Shiroishi Sapporo 34.47Teine Sapporo 56.77Toyohira Sapporo 46.23Aoba Sendai 302.24Izumi Sendai 146.61Miyagino Sendai 58.19Taihaku Sendai 228.39Wakabayashi Sendai 50.86Aoi Shizuoka 1,073.76Shimizu- Shizuoka 265.09Suruga Shizuoka 73.05Aoba Yokohama 35.22Asahi Yokohama 32.73Hodogaya Yokohama 21.93Isogo Yokohama 19.05Izumi Yokohama 23.58Kanagawa Yokohama 23.73Kanazawa Yokohama 30.96Kōhoku Yokohama 31.40Kōnan Yokohama 19.90Midori Yokohama 25.51Minami Yokohama 12.65Naka Yokohama 21.20Nishi Yokohama 7.03Sakae Yokohama 18.52Seya Yokohama 17.17Totsuka Yokohama 35.79Tsurumi Yokohama 33.23Tsuzuki Yokohama 27.87
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