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data japan 2023Total population for Japan in 2025 was 123,294,513, a 0.53% dec from 2022. Total population for Japan in 2022 was 123,951,692, a 0.53% dec from 2021. Total population is based onJapan 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