data japanThe current population of Japan is 123,271,281 as of Friday, March 28, 2025, based on Worldometer’s elaboration of the latest United Nations data 1.; Japan 2025 population isSummary statistics; Region: 2015: Eastern Asia : Surface area (sq km) 2014: 377930: Data refer to 1 October 2007. Population (proj., 000) 2016: 126324 : Pop. density (per