Japan is an island country of East Asia in the northwest Pacific Ocean. The current population of Japan is 126,398,997 as of Friday, September 11, 2020, based on Worldometer elaboration of the latest United Nations data. Population Pyramid, Age Structure, Sex Ratio (Males to Females), Life Expectancy, Dependency Ratio of Japan. According to the Statistical Bureau of Japan, the population of Japan as of 2019 is at 126. Population, total - Japan from The World Bank: Data. The total population in Japan was estimated at 126.