According to the census in 2005, there were 2,628,811 residents in Osaka, an increase of 30,037 or 1.2% from 2000. There were 1,280,325 households with approximately 2.1 persons per household. The population density was 11,836 persons per km². The Great Kanto Earthquake caused a mass migration to Osaka between 1920 and 1930, and the city became Japan's largest city in 1930 with 2,453,573 people, outnumbering even Tokyo, which had a population of 2,070,913. The population peaked at 3,252,340 in 1940, and had a post-war peak of 3,156,222 in 1965, but continued to decrease since, as the residents moved out to the suburbs.
There were 99,775.5 registered foreigners, the two largest groups being Korean (71,015) and Chinese (11,848). Ikuno, with its Tsuruhashi district, is the home to one of the largest population of Korean residents in Japan, with 27,466 registered zainichi Koreans.
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