2023, the following 250 municipalities and ten prefectures have established a partnership oath system, comprising about 66% of the Japanese population. In 34 further jurisdictions, such policies will soon take effect. Prefectures Ibaraki (1 July 2019) Osaka (22 January 2020) Gunma (21 December 2020) Saga (27 August 2021) Mie (1 September 2021) Aomori (7 February 2022) Akita (1 April 2022) Fukuoka (1 April 2022) Tochigi (1 September 2022) Tokyo (1 November 2022) Shizuoka (1 March 2023) Toyama (1 March 2023) Municipalities Shibuya, Tokyo (28 October 2015) Setagaya, Tokyo (5 November 2015) Iga, Mie (1 April 2016) Takarazuka, Hyōgo (1 June 2016) Naha, Okinawa (8 July 2016) Sapporo, Hokkaido (1 June 2017) Fukuoka, Fukuoka (2 April 2018) Osaka, Osaka (9 July 2018) Nakano, Tokyo (20 August 2018) Ōizumi, Gunma (1 January 2019) Chiba, Chiba (29 January 2019) Edogawa, Tokyo (1 April 2019) Fuchū, Tokyo (1 April 2019) Hirakata, Osaka (1 April 2019) Kumamoto, Kumamoto (1 April 2019) Odawara, Kanagawa (1 April 2019) Sakai, Osaka (1 April 2019) Sōja, Okayama (1 April 2019) Toshima, Tokyo (1 April 2019) Yokosuka, Kanagawa (1 April 2019) Kanuma, Tochigi (3 June 2019) Miyazaki, Miyazaki (10 June 2019) Kitakyushu, Fukuoka (1 July 2019) Nishio, Aichi (1 September 2019) Nagasaki, Nagasaki (2 September 2019) Sanda, Hyōgo (11 October 2019) Katano, Osaka (22 November 2019) Yokohama, Kanagawa (2 December 2019) Daitō, Osaka (4 December 2019) Kamakura, Kanagawa (4 December 2019) Mitoyo, Kagawa (1 January 2020) Amagasaki, Hyōgo (6 January 2020) Bunkyō, Tokyo (1 April 2020) Hamamatsu, Shizuoka (1 April 2020) Kijō, Miyazaki (1 April 2020) Koga, Fukuoka (1 April 2020) Minato, Tokyo (1 April 2020) Nara, Nara (1 April 2020) Niigata, Niigata (1 April 2020) Sagamihara, Kanagawa (1 April 2020) Saitama, Saitama (1 April 2020) Takamatsu, Kagawa (1 April 2020) Tokushima, Tokushima (1 April 2020) Yamatokōriyama, Nara (1 April 2020) Zushi, Kanagawa (1 April 2020) Kawagoe, Saitama (1 May 2020) Toyoake, Aichi (1 May 2020) Itami, Hyōgo (15 May 2020) Ashiya, Hyōgo (17 May 2020) Hayama, Kanagawa (1 July 2020) Inabe, Mie (1 July 2020) Kawasaki, Kanagawa (1 July 2020) Okayama, Okayama (1 July 2020) Tondabayashi, Osaka (1 July 2020) Kawanishi, Hyōgo (1 August 2020) Kaizuka, Osaka (1 September 2020) Kyoto, Kyoto (1 September 2020) Sakado, Saitama (1 October 2020) Koganei, Tokyo (20 October 2020) Kitamoto, Saitama (1 November 2020) Matsudo, Chiba (1 November 2020) Tochigi, Tochigi (1 November 2020) Kokubunji, Tokyo (15 November 2020) Kōnosu, Saitama (1 December