Historical Demography of Prefectures of Japan
Population before 1920 was calculated based on information of family registries (戸籍, koseki?), while door-to-door censuses have been held every 5 years as of October 1 since 1920 in Japan except for the year of 1945.
As for prefectural population before 1945, prefectures that constituted official Japan Proper or Mainland Japan (内地, naichi?, inner lands) are only given. Karafuto Prefecture (樺太府, Karafuto-fu?) or Southern Sakhalin was officially incorporated into Japan Proper since March 26, 1943 until the end of the World War II, while Taiwan, Kwantung Leased Territory, Korea and South Pacific Mandate were treated as exterior territories (外地, gaichi?, outer lands). At the end of war, Japan lost possessions of Southern Sakhalin (Karafuto-fu), Kuril Islands (part of Hokkaidō), Ogasawra Islands (part of Tōkyō-to), Amami and Tokara Islands (part of Kagoshima-ken), Daitō Islands and Ryukyu Islands (Okinawa-ken). For the population of the colonies of the former Empire of Japan, see Demographics of Imperial Japan.
Read more about this topic: List Of Japanese Prefectures By Population
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