Oga City

Akita Prefecture · City

Oga City is in western Akita Prefecture and covers most of the Oga Peninsula, which juts into the Sea of Japan. It is known for "Namahage of Oga," held on New Year's Eve. Varied landscapes spread across the city, such as Mt. Kanpu, Cape Nyudo and Ichinomegata, a lake formed by a volcano. The Oga Aquarium, which has polar bears, is also popular.

Key facts

Population: 21,566 869th in Japan2025 Census
5-year change: −14.3% 112th in Japanfrom 25,154 in 2020
Area: 241 km² 509th in Japan
Population density: 90 people/km² 1,088th 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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