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data osakaThe current metro area population of Osaka in 2025 is 18,922,000, a 0.24% dec from 2025. The metro area population of Osaka in 2025 was 18,967,000 , a 0.24% dec from 2025.Osaka 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