Japan population is equivalent to 1.67% of the total world population. Japan ranks number 11 in the list of countries (and dependencies) by population. The population density in Japan is 349 per Km 2 (904 people per mi 2). The total land area is 364,555 Km2 (140,755 sq. miles) 93.8 % of the population is urban (119,327,813 people in 2018)