ENERGY PROFILE Japan

data japan 2023The 2025 population density in Japan is 338 people per Km2 (875 people per mi2), calculated on a total land area of 364,555 Km2 (140,755 sq. miles). Largest Cities in Japan # City NameIn Japan, the current population is 124,370,947 as of 2025 with a projected decrease of 15% to 105,123,167 by 2050. −0.5% ‎+0.041 percentage points change since 2022. Population by