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 Name2025 : U.S. trade in goods with Japan ; July 2025, 7,103.3, 13,221.8 ; August 2025, 6,792.3, 11,660.1 ; September 2025, 6,798.1, 11,599.8 ; October 2025, 6,696.8