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In 2019, two thirds of all international migrants were living in just 20 countries. The largest number of international migrants (51 million) resided in the United States of America, equal to about 19 per cent of the world's total. 1. Levels and trends in international migrant stock -- 2. Net international migration -- 3. International migration policies -- 4. Legal and normative framework for international migration -- Annex. Classification of countries or areas by region.