Aioi City

Hyogo Prefecture · City

Aioi City faces the deep, jagged Aioi Bay and has prospered as a shipbuilding town since a dock was built at the end of the Meiji era. In the Showa 30s it once ranked first in the world in launched tonnage. The spring Peron boat race is a specialty, and the city has Manyo-no-Misaki cape overlooking the bay and Michi-no-Eki Aioi-Peironjo.

Key facts

Population: 26,007 797th in Japan2025 Census
5-year change: −8.3% 691st in Japanfrom 28,355 in 2020
Area: 90.40 km² 1,022nd in Japan
Population density: 288 people/km² 696th in Japan

Source: Statistics Bureau of Japan, 2025 Population Census (population, area and density); area from the Geospatial Information Authority of Japan (GSI), Area Statistics of Prefectures and Municipalities (2025). National ranks are among the 1,741 municipalities, ordered by this site from these values.

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Places to visit

Chosen automatically, most popular first, from landmarks and cultural properties registered in Wikidata (we have not checked whether each is open). Names and descriptions: Wikidata (CC0); photos: Wikimedia Commons (photographer and license under each photo).

National parks in this city

Setonaikai National ParkTotal park area 673 km²Spans Hyogo, Wakayama, Okayama, Hiroshima, Yamaguchi, Tokushima, Kagawa, Ehime, Oita

Chosen by overlaying the park boundaries (Ministry of the Environment, Biodiversity Center of Japan, "National Park Areas" GIS data, updated April 28, 2025, combined and simplified by NIPPON ATLAS) with municipal boundaries (National Land Numerical Information, January 2021), keeping overlaps of about 0.5 km² or more (approximate). Areas are the land areas from the Ministry of the Environment, "Overview of National Parks" (April 10, 2026). All national parks

Neighboring municipalities

Municipalities sharing a boundary (computed from the National Land Numerical Information administrative boundaries, January 2021).

The description was written for this site, picking out representative features.

Figures come from official Japanese statistics (such as the 2025 Census by the Statistics Bureau of Japan), with the source and year shown next to each one. Photos are freely licensed images from Wikimedia Commons; the photographer and license are shown under each photo.

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