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 NameAccording to the Japan Automotive Dealers Association and Japan Lht Motor Vehicle and Motorcycle Association, sales in Japan in April 2025 increased 10.5% to 342,876 units. ... Apr.