data osakaOsaka's 2025 population is now estimated at 18,921,600. In 1950, the population of Osaka was 7,005,280. Osaka experienced a decrease of -45,900 residents over the past year, marking anOsaka is a city in the Kansai region of Honshu in Japan. It is home to 19.1 million people in the urban area and 2.5 million in the city. It is the second largest metropolitan area in