Tokyo Population 2024 Trends And Future. The population of japan in 2022 was 123,951,692, a 0.53% decline from 2021. The population of japan in 2021 was 124,612,530, a 0.5% decline from 2020.
At the same time, it has one of the highest life expectancies. The population of japan in 2021 was 124,612,530, a 0.5% decline from 2020.