Disparity between votes in single-seat constituencies for the House of Representatives increases by up to 2.275 times, Ministry of Internal Affairs and Communications 2025 Census final figures

According to the final figures for the 2025 census released by the Ministry of Internal Affairs and Communications on the 29th, the population disparity (difference per vote) in single-seat constituencies for the House of Representatives is up to 2.275 times. Of the 289 constituencies, 40 constituencies more than doubled, which is the standard for determining unconstitutionality.

The biggest disparity is between Fukuoka 2nd Ward, which has the largest population (558,760 people), and Ishikawa 3rd Ward, which has the smallest population (245,613 people). Preliminary figures announced in May were 2.274 times higher.

On the other hand, if we use Tottori 1st Ward, which is the ``smallest constituency in the prefecture with the lowest population per lawmaker'' as a standard, there are 18 constituencies where the disparity is more than double. There are four constituencies with a population lower than Tottori's 1st ward.

These 22 constituencies are expected to be targeted when the country's House of Representatives Electoral District Delimitation Council (District Delimitation Council) revise the district divisions to correct disparities. It covers 13 prefectures: Hokkaido, Miyagi, Akita, Ibaraki, Chiba, Tokyo, Kanagawa, Ishikawa, Aichi, Kyoto, Osaka, Hyogo, and Fukuoka.

The disparity in House of Councilors constituencies is 3.178 times between Tokyo (1,128,647 people) and Fukui Prefecture (355,094 people). This was a slight decrease from the preliminary figure of 3.189 times.