From the first House of Councillors election in 1947 until the 1992 election, Gifu elected two Councillors to six-year terms at alternating elections held every three years. Electoral reform in 1994 increased Gifu's representation to four Councillors, which began to take effect at the 1992 election, at which two Councillors were elected.
In September 2012 Gifu had 1,684,766 registered voters,[2] the second-lowest of the 12 prefectures that were represented by 4 Councillors at that time. By comparison, the three most populous districts of Hokkaido, Hyogo at-large district and Fukuoka districts each had more than 4 million voters[2] but were also represented by four Councillors each. To address this malapportionment, a November 2012 amendment to the Public Offices Election Law reduced Gifu's representation (along with Fukushima's) representation to two Councillors.[3] This change began to take effect at the 2013 election, when only one Councillor was elected in Gifu, and will be completed at the 2016 election. The district has 1,666,610 registered voters as of September 2015.[4]
The Councillors currently representing Fukushima are:
^"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.
^ ab"平成24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 2012] (in Japanese). 28 December 2012. Retrieved 15 March 2016.
^"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). 28 December 2015. Retrieved 15 March 2016.
^"渡辺 猛之(わたなべ たけゆき):参議院" [Watanabe, Takeyuki: House of Councillors] (in Japanese). Retrieved 15 March 2016.
^"小見山 幸治(こみやま よしはる):参議院" [Komiyama, Yoshiharu: House of Councillors] (in Japanese). Archived from the original on 8 March 2016. Retrieved 15 March 2016.
^"大野 泰正(おおの やすただ):参議院" [Ohno, Yasutada: House of Councillors] (in Japanese). Retrieved 15 March 2016.
^"歴代参議院議員一覧" [List of Former Councillors] (PDF) (in Japanese). House of Councillors. 2014. Archived from the original(PDF) on 4 March 2016. Retrieved 15 March 2016.