"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.
"平成27年9月2日現在選挙人名簿及び在外選挙人名簿登録者数" [Number of resident and non-resident enrolled voters as of 2 September 2015] (in Japanese). 2 September 2015. Retrieved 19 April 2016.