Population Of Tokyo City 2025. The 2025 population density in japan is 339 people per km 2 (879 people per mi 2), calculated on a total land area of 364,555 km2 (140,755 sq. These prefectures account for 37.5 percent of the total population.

In 1950, the population of tokyo was 11,274,600. United nations population projections are also included through the year 2035.