Kosuge (小菅村, Kosuge-mura) is a village located in Yamanashi Prefecture, Japan. As of 31 October 2018, the village had an estimated population of 701, and a population density of 13 persons per km2. The total area of the village is 52.65 square kilometres (20.33 sq mi).

View of Kosuge Village
View of Kosuge Village
Flag of Kosuge
Official seal of Kosuge
Location of Kosuge in Yamanashi Prefecture
Location of Kosuge in Yamanashi Prefecture
Kosuge is located in Japan
Coordinates: 35°45′36.9″N 138°56′25″E / 35.760250°N 138.94028°E / 35.760250; 138.94028Coordinates: 35°45′36.9″N 138°56′25″E / 35.760250°N 138.94028°E / 35.760250; 138.94028
PrefectureYamanashi Prefecture
 • Total52.78 km2 (20.38 sq mi)
 (October 1, 2018)
 • Total701
 • Density13/km2 (34/sq mi)
Time zoneUTC+9 (Japan Standard Time)
Phone number0428-87-0111
Address4698 Kosuke-mura, Kitatsuru-gun, Yamanashi 409-0211
WebsiteOfficial website
Kosuge village hall


Kosuge is located in the mountainous far northeastern corner of Yamanashi Prefecture. The municipality consists of eight hamlets of Hashidate, Kawaike, Tadamoto, Nakagumi, Tobu, Shirasawa, Konagata, Nagasaku. The seven villages from Hashidate to Konagata are along the Kobuchi River in the Tama River water system, and the Nagakushi village is along the Tsurugawa River in the Sagami River water system. The hamlets have elevations between 540 and 780 meters. Forest occupies 95% of the total area of the village, with 30% protected watershed forest within the Chichibu Tama Kai National Park, providing water for the Tokyo Metropolis.

Neighboring municipalitiesEdit

Yamanashi Prefecture

Tokyo Metropolis


Per Japanese census data,[1] the population of Kosuge has decreased over the past 40 years.

Historical population
1940 1,734—    
1950 2,160+24.6%
1960 2,021−6.4%
1970 1,461−27.7%
1980 1,284−12.1%
1990 1,177−8.3%
2000 1,084−7.9%
2010 816−24.7%


The village has a climate characterized by characterized by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Kosuge is 8.9 °C. The average annual rainfall is 1552 mm with September as the wettest month. The temperatures are highest on average in August, at around 22.1 °C, and lowest in January, at around -2.2 °C.[2]


During the Edo period, all of Kai Province was tenryō territory under direct control of the Tokugawa shogunate. During the cadastral reform of the early Meiji period on July 1, 1889, the village of Kosuge was created within Kitatsuru District, Yamanashi. Discussions to merge with the neighboring city of Kōshū, Yamanashi in 2008 have been shelved.


The economy of Kosuge is primarily based on forestry and agriculture.


Kosuge has one public elementary school and one public junior high school operated by the village government. The village does not have a high school.



The village has no passenger rail service. The nearest train station is Oku-Tama Station in Okutama, Tokyo.


  • All route buses run in Kosuge stop at Kosuge-no-Yu busstop.
No Via Destination Company Note
奥12 Mount Daibosatsu eastern gate・Miyama-bashi・Lake Okutama Okutama Station Nishi Tokyo Bus
Miyama-bashi・Lake Okutama
Tozura・Miyama-bashi・Lake Okutama
Fukashiro Dam・Take-no-mukai・Kamiwada・SaruhashiSaruhashi StationOtsuki Station Ōtsuki Central Hospital Fujikyū Bus
Fukashiro Dam・Take-no-mukai・Kamiwada・SaruhashiSaruhashi Station Otsuki Station
Fukashiro Dam・Take-no-mukai・Kamiwada・SaruhashiSaruhashi Station Fujikyu Bus Ōtsuki Office
Tsuru Pass・Īo Uenohara Station Runs on holidays from April though July (spring season), from September through December (autumn season)
Non stop Matsuhime Pass
Nagasaku Line Tamoto-bashi・Yakuba-mae・Hashidate-shita(Mount Daibosatsu eastern gate) Hashidate-ue Kosuge Municipal Bus Buses are operated on 3 services for Hashidate-ue and 1 service for Iio on weekdays morning.On some hours excluding weekdays morning, you are able to ride on the bus routes by you reserve the demand bus with calling phone to Kosuge, Yamanashi on holidays and between 10:30 and 18:30 on weekdays[3][4] But, the services are suspension on Sundays.
Tsuru Pass・Nagasaku Iio



  1. ^ Kosuge population statistics
  2. ^ Kosuge climate data
  3. ^ The demand bus runs for Take-no-mukai busstop (Ōtsuki, Yamanashi). At the bus stop you can transfer onto Fujikyu Bus bound for Ōtsuki Station
  4. ^ The demand bus bound for Ōtsuku busstop (Okutama District). At the bus stop you can transfer onto Nishi Tokyo Bus bound for Okutama Station and Tabayama.

External linksEdit

  Media related to Kosuge, Yamanashi at Wikimedia Commons