| Apr. 1889 |
City of Osaka established |
| Jun. 1889 |
First City Council election (restricted election) |
| Jun. 1929 |
First City Council election (universal suffrage) |
| Apr. 1947 |
First City Council election after World War II (First female
councilor elected) |
| Jan. 1986 |
Current City Hall completed |
| Apr. 2015 |
18th City Council election after World War II |
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