Japan ranks number 11 in the list of countries (and dependencies) by population. The population density in Japan is 346 per Km2 (896 people per mi2). The total land area is 364,571 Km2 (140,761 sq. miles) 94.5 % of the population is urban (119,160,931 people in 2017) The median age in Japan is 46.9 years.