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The Census for 1930
The national census taken in the fall of 1930 showed that the total population of the Japanese Empire was 90,396,045, according to official figures announced by the home office. Of this total, 64,450,005 persons were registered in Japan proper, 21,058,305 in Chosen, 4,592,537 in Formosa, and 295,198 in the Japanese portion of Sakhalin. There were 330,000 more men than women in Japan proper. In point of density of population, Japan proper had an average of 436 persons per square mile, while for the empire the figure was 346 per square mile. Formosa came second with 330 inhabitants to the square mile, Chosen third, with 247, and Sakhalin last, with 24. Among the prefectures, Tokyo ranged first in density of population with 6,531 per square mile, while Hokkaido came last with 82. These figures are based on a total area for the empire of 260,704 miles. In
JAPAN. JAMA. 1933;100(12):985. doi:10.1001/jama.1933.02740120123026