Between 1947 and 2007 Tochigi was represented by four councillors, elected two at a time by single non-transferable vote. Like many two-member districts Tochigi often split seats between the two major postwar parties: the Liberal Democratic Party (LDP) and the Japan Socialist Party (JSP). In the 1965 election, left-wing Socialist incumbent Takeshi Tokano finished only third behind two LDP candidates while another Socialist candidate, Takashi Hagiwara, received almost as many votes as Tokano. In 1968, the LDP could repeat this success against incumbent Socialist Seiichi Inaba who finished only fourth behind Tokano, this time running as an independent. In the following election of 1971 Tokano returned as a Socialist candidate to his seat with the highest vote; and Seiichi Inaba became a Socialist Member of the House of Representatives where he was a member of the sp cial committee investigating the Lockheed scandal.
In the election of 1974, two independents, one DSP and one Kōmeitō candidate joined the traditional field of LDP, JSP and JCP candidates. Turnout jumped to 74% and independent Takaji Ōshima beat out LDP incumbent Yano for second place, but subsequently joined the LDP himself. Six years later, the leftist vote was still split among one Socialist, one Democratic Socialist and one Communist while there were only two LDP candidates on the conservative side: Once again, the party gained two Tochigi seats in one election. They held onto those seats until the 1990s when the declining JSP collapsed during the party's participation in a LDP government and was ultimately replaced by the Democratic Party of Japan as the largest opposition party.
Since the 2010 House of Councillors election, the district has been represented in the House of Councillors by 2 Councillors, with one Councillor being up for election every 3 years
As of 23 January 2023, the Councillors currently representing this district are as follows:
^"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栃木選挙区 - 第1回参議院議員選挙 [Tochigi At-Large District - 1st House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^栃木選挙区 - 第1回参議院議員補欠選挙 [Tochigi At-Large District - 1st House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第2回参議院議員選挙 [Tochigi At-Large District - 2nd House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第3回参議院議員選挙 [Tochigi At-Large District - 3rd House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第4回参議院議員選挙 [Tochigi At-Large District - 4th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第5回参議院議員選挙 [Tochigi At-Large District - 5th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第6回参議院議員選挙 [Tochigi At-Large District - 6th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第6回参議院議員補欠選挙 [Tochigi At-Large District - 6th House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第7回参議院議員選挙 [Tochigi At-Large District - 7th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第8回参議院議員選挙 [Tochigi At-Large District - 8th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第9回参議院議員選挙 [Tochigi At-Large District - 9th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第10回参議院議員選挙 [Tochigi At-Large District - 10th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第10回参議院議員補欠選挙 [Tochigi At-Large District - 10th House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第11回参議院議員選挙 [Tochigi At-Large District - 11th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第12回参議院議員選挙 [Toichigi At-Large District - 12th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第12回参議院議員補欠選挙 [Tochigi At-Large District - 12th House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第13回参議院議員選挙 [Tochigi At-Large District - 13th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第14回参議院議員選挙 [Tochigi At-Large District - 14th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第15回参議院議員選挙 [Tochigi At-Large District - 15th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第16回参議院議員選挙 [Tochig At-Large District - 16th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第17回参議院議員選挙 [Tochigi At-Large District - 17th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第17回参議院議員補欠選挙 [Tochigi At-Large District - 17th House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
^ ab栃木選挙区 - 第18回参議院議員選挙 [Tochigi At-Large District - 18th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^栃木選挙区 - 第19回参議院議員選挙 [Tochigi At-Large District - 19th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^栃木選挙区 - 第20回参議院議員選挙 [Tochigi At-Large District - 20th House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第21回参議院議員選挙 [Tochigi At-Larege District - 21st House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第22回参議院議員選挙 [Tochi At-Large District - 22nd House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第23回参議院議員選挙 [Tochigi At-Large District - 23rd House of Councillors Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-23.
^ ab栃木選挙区 - 第25回参議院議員選挙 [Tochigi At-Large District - 25th House of Councillors Election]. go2senkyo.com (in Japanese). 2019-07-03. Retrieved 2023-01-23.
^ abc"栃木選挙区 - 第26回参議院議員選挙" [Tochigi At-Large District - 26th House of Councillors Election]. go2senkyo.com (in Japanese). 2022-06-22. Retrieved 2023-01-23.
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