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 onIn 2025, Japan had more than twice as many deaths as births, leading to a natural population dec (excluding mration) of over 800,000.