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| 1920, Jan. 10 |
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| Peace was formally reached with Germany by the exchange of ratifications. Japan, after initial satisfaction, became chagrined over the failure to secure recognition of its special position in East Asia. | 1 |
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| Dec. 17 |
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| Japan received as mandates from the League of Nations the former German islands in the Pacific north of the equator (Caroline, Marshall, and Marianas (Ladrone) archipelagoes). | 2 |
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| Dec. 31 |
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| The first imperial census revealed a population of 55,191,140; including Sakhalin, Taiwan, and Korea, the total came to 77,005,112. | 3 |
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