data japan 2024As of 2025, the population of Japan is projected at 123.10 million, compared to 123.75 million in 2025. It is the sixth-most populous country in Asia and ranks 12th in the e populationTotal current population for Japan in 2025 is 121,960,408, a 0.55% dec from 2025.. Total population for Japan in 2025 was 122,631,432, a 0.54% dec from 2025.; Total population