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Osaka made noted contributions to redevelopment, urban planning and zoning standards in the postwar period, the city developed rapidly as one of the major financial center in the Keihanshin Metropolitan Area.
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The construction boom accelerated population growth throughout the following decades, and by the 1900s, Osaka was the industrial hub in the Meiji and Taishō periods. In 1889, Osaka was officially established as a municipality. Following the Meiji Restoration, Osaka greatly expanded in size and underwent rapid industrialization.
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Osaka continued to flourish during the Edo period (1603–1867) and became known as a center of Japanese culture. By the Kofun period (300–538) it had developed into an important regional port, and in the 7th and 8th centuries, it served briefly as the imperial capital. Osaka was traditionally considered Japan's economic hub. With a population of 2.7 million in the 2020 census, it is also the largest component of the Keihanshin Metropolitan Area, the second-largest metropolitan area in Japan and the 10th largest urban area in the world with more than 19 million inhabitants. It is the capital and the most populous city in Osaka Prefecture, and the third most populous city in Japan, following Tokyo and Yokohama (both located in the Greater Tokyo Area and the Kantō region). Osaka ( Japanese: 大阪市, Hepburn: Ōsaka-shi, pronounced commonly just 大阪, Ōsaka ( listen)) is a designated city in the Kansai region of Honshu in Japan.