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Before the creation of the district, Nakano Ward was split between the 7th and 10th districts, and the eastern parts of Suginami Ward were formerly split between the 7th and 8th districts.
"総務省|令和4年9月1日現在選挙人名簿及び在外選挙人名簿登録者数" [Ministry of Internal Affairs and Communications - Number of registered voters as of 1 September 2022] (in Japanese). Retrieved 2023-01-04.