data japanStatements that can be derived from Japan's population data. Japan has a population of 123,753,041 people, as of July 1, 2025. Japan's population is equivalent to 1.55% of the totalJapan 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 interactive