data japan 2023Key information about Japan population. The Japan population reached 123.7 million people in Dec 2025, compared with the previously reported fure of 124.3 million people in Dec 2025;Japan is a country in Asia. The population in Japan was 124,516,650 in 2025. The unemployment rate in Japan was 2.6% in 2022. The nominal GDP per capita in Japan was $33,766.53 in