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 NameGraph and download economic data for Gross Domestic Product for Japan (JPNNGDP) from Q1 1994 to Q4 2025 about Japan and GDP.