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 NameTop Google Search Queries in Japan 2025. Weather is Japan's top Google search query for 2025, with an index score of 100 points. Corona followed closely in