data japan 2024The 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 NameThe Gross Domestic Product (GDP) in Japan was worth 4204.49 billion US dollars in 2025, according to official data from the World Bank. The GDP value of Japan represents 3.99