Japan , as the demography shows, has a very high density in its population . Demographically the most crowded cities and regions in Japan are, Honshu, Kyushu, Yokohama, Osaka, Kyoto, Kobe, Kawasaki and many more. Tokyo, the capital of Japan is the largest metropolitan city in Japan with highest concentration of population . Japan has a high rate of urban population.Japan also has the highest number of elderly citizens in the whole world.