Onojo City

Fukuoka Prefecture · City

Official website Fukuoka Prefecture page

Onojo City developed as a commuter town for Fukuoka City, and its name comes from Ono Castle, an ancient mountain fortress. The remains of Ono Castle are on Mt. Shioji, and the Ushikubi Sue Ware Kiln Site was a large ancient pottery production area. The city also has a water purification plant that supplies the Fukuoka metropolitan area.

Key facts

Population: 103,552 265th in Japan2025 Census
5-year change: +1.4% 93rd in Japanfrom 102,085 in 2020
Area: 26.89 km² 1,487th in Japan
Population density: 3,851 people/km² 123rd 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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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).

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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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