| Koumi | |
| Native Name Lang: | ja |
| Settlement Type: | Town |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | |
| Coordinates: | 36.095°N 138.4835°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Chūbu (Kōshin'etsu) |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Nagano |
| Subdivision Type3: | District |
| Subdivision Name3: | Minamisaku |
| Leader Title: | Mayor |
| Area Total Km2: | 114.20 |
| Population Total: | 4676 |
| Population As Of: | April 2019 |
| Population Density Km2: | auto |
| Timezone1: | Japan Standard Time |
| Utc Offset1: | +9 |
| Blank Name Sec1: | Symbols |
| Blank Info Sec1: | |
| Blank1 Name Sec1: | • Tree |
| Blank1 Info Sec1: | Larch |
| Blank2 Name Sec1: | • Flower |
| Blank2 Info Sec1: | Enkianthus campanulatus |
| Blank3 Name Sec1: | • Bird |
| Blank Name Sec2: | Phone number |
| Blank Info Sec2: | 0267-92-1192 |
| Blank1 Name Sec2: | Address |
| Blank1 Info Sec2: | 57-1 Toyosato, Koumi-machi, Minamisaku-gun, Nagano-ken 384-1192 |
is a town located in Nagano Prefecture, Japan., the town had an estimated population of 4,676 in 2012 households,[1] and a population density of 41 persons per km2. The total area of the town is 114.2sqkm.
The town mascot is "Ptylitza", an imaginary small gnome-like creature, images of which can be seen all over the town.[2]
Koumi is located in the far east of Nagano. The nearest city is Saku, about 40 minutes drive away. Nagano city is about 100 km away. Mount Tengu (2646 meters) is located on the border of Koumi with Chino. the Chikuma River flows through the town.
The town has a humid continental climate characterized by warm and humid summers, and cold winters with heavy snowfall (Köppen climate classification Dfb). The average annual temperature in Koumi is 8.2 °C. The average annual rainfall is 1398 mm with September as the wettest month. The temperatures are highest on average in August, at around 20.9 °C, and lowest in January, at around -4.0 °C.[3]
Per Japanese census data,[4] the population of Koumi has declined over the past 60 years.
The area of present-day Koumi was part of ancient Shinano Province. The village of Koumi was established on April 1, 1889 with the establishment of the municipalities system. It merged with the village of Kitamaki on September 30, 1956 and was elevated to town status.
Koumi has one public elementary school operated by the city government and one public middle school shared with Kitaaiki and Minamiaiki villages. Koumi has a public high school operated by the Nagano Prefectural Board of Education.