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Japanese prefectures by annual population change, in percent (Oct 1, 2021 to Oct 1, 2022). Japanese prefectures by population density (2022). The tan color means between 0 and 99 per km2. This is a list of Japanese prefectures by population. For details of administrative divisions of Japan, see Prefectures of Japan.
KANTO, KEIHANSHIN and TOKAI are three largest metropolitan areas which have about 2/3 of total population of Japan. Out of 47 prefectures, 13 are red and 34 are green. The population of Japan has been decreasing since 2011. Only 8 prefectures had increased its population compared to 2010, due to internal migration to large cities.
One common division, preferred by the English Wikipedia, groups the prefectures into eight regions. In that division, of the four main islands of Japan, Hokkaidō, Shikoku, and Kyūshū make up one region each, the latter also containing the Satsunan Islands, while the largest island Honshū is divided into five regions.
Japan’s population crisis is accelerating, with the number of nationals falling by more than 800,000 in the past year – echoing similar trends seen in other East Asian countries.
The Japanese government also considered a plan to merge several groups of prefectures, creating a subnational administrative division system consisting of between nine and 13 states, and giving these states more local autonomy than the prefectures currently enjoy. [4]
47 prefectural entities of Japan. The top tier of administrative divisions are the 47 prefectural entities: 43 prefectures (県, ken) proper, two urban prefectures (府, fu, Osaka and Kyōto), one "circuit" (道, dō, Hokkaidō), and one "metropolis" (都, to, Tokyo Metropolis). Although different in name, they are functionally the same.
Japan has a population of over 123 million as of 2025, making it the eleventh-most populous country. The capital of Japan and its largest city is Tokyo; the Greater Tokyo Area is the largest metropolitan area in the world, with more than 37 million inhabitants as of 2024. Japan is divided into 47 administrative prefectures and eight traditional ...
The prefectures of Japan are the country's 47 sub-national jurisdictions: one "metropolis" (都; To), Tokyo; one "circuit" (道; Dō), Hokkaidō; two urban prefectures (府; Fu), Osaka and Kyoto; and 43 other prefectures (県; Ken). In Japanese, they are commonly referred to collectively as Todōfuken (都道府県).