data japan 2023Japan joined the OECD in 1964, becoming the Organisation’s 21st member country and its first from the Asia-Pacific region. it is one of 38 OECD Members. ... Key data and interactiveThe 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 is