Komoro City

Nagano Prefecture · City

Komoro City is a castle town on a plateau above the Chikuma River at the southern foot of Mt. Asama. The site of Komoro Castle, an "anajiro" (hole castle) built lower than its town, is loved as Kaikoen Park and was the setting of a poem by Shimazaki Toson. The city prospered as a post town on the Hokkoku Kaido road and also produces Chinese cabbage and lettuce.

Key facts

Population: 40,185 607th in Japan2025 Census
5-year change: −2.0% 1,397th in Japanfrom 40,991 in 2020
Area: 98.55 km² 988th in Japan
Population density: 408 people/km² 583rd 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).

Mountains in this city

Mt. Jakotsu2,366 m
Mt. Takamine2,106 m

Mountains whose summit is in this municipality (mountains of 800 m or higher on this site's map, and mountains in the famous-mountain lists). Elevations from Wikidata and other sources.

National parks in this city

Joshin'etsukogen National ParkTotal park area 1,511 km²Spans Gunma, Niigata, Nagano

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).

Other municipalities in Nagano Prefecture

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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