Tatsuno Town Hall
Location of Tatsuno in Nagano Prefecture
Coordinates: 35°58′56.7″N 137°59′15.2″E / 35.982417°N 137.987556°E / 35.982417; 137.987556Coordinates: 35°58′56.7″N 137°59′15.2″E / 35.982417°N 137.987556°E / 35.982417; 137.987556
RegionChūbu (Kōshin'etsu)
 • Total169.20 km2 (65.33 sq mi)
 (June 1, 2019)
 • Total18,951
 • Density110/km2 (290/sq mi)
Time zoneUTC+9 (Japan Standard Time)
• FlowerAdonis amurensis
Phone number0266-41-1111
Address1-banchi, Chuo Nakaminowa, Tatsuno-machi, Kitaina-gun, Nagano-ken 399-0493
WebsiteOfficial website
Kojinyama Park, Tatsuno
Kojinyama Park, Tatsuno

Tatsuno (辰野町, Tatsuno-machi) is a town located in Nagano Prefecture, Japan. As of 1 June 2019, the town had an estimated population of 18,951 in 7917 households,[1] and a population density of 112 persons per km². The total area of the town is 169.20 square kilometres (65.33 sq mi).


Tatsuno is located in the Ina Valley of south-central Nagano Prefecture, bordered by the Kiso Mountains. The Tenryū River flows through the town, which is surrounded by mountains and is rich in a natural environment. It is takes about 3 hours from Tokyo, 2 hours from Nagoya, 5 hours from Kyoto by train and equally by car. Part of the town is within the borders of the Enrei Ōjō Prefectural Natural Park. The Yokokawa Dam is located in Tatsuno.

Surrounding municipalities


Per Japanese census data,[2] the population of Tatsuno has remained relatively steady over the past 60 years.

Historical population
1940 20,842—    
1950 24,146+15.9%
1960 22,419−7.2%
1970 22,351−0.3%
1980 23,894+6.9%
1990 23,901+0.0%
2000 22,407−6.3%
2010 20,913−6.7%


The village has a climate characterized by characterized by warm and humid summers, and cold winters (Köppen climate classification Dfa). The average annual temperature in Tatsuno is 6.7 °C. The average annual rainfall is 1549 mm with September as the wettest month. The temperatures are highest on average in August, at around 22.2 °C, and lowest in January, at around -3.1 °C.[3]


The area of present-day Tatsuno was part of ancient Shinano Province. The village of Inatomi established on April 1, 1889 by the establishment of the municipalities system, and was elevated to town status on January 1, 1947, changing its name to Tatsuno at that time. The neighboring village of Asahi was annexed on April 1, 1955, followed by Kawashima on September 30, 1956 and Ono on March 31, 1961.


Tatsuno has five public elementary schools and five public middle school operated by the town government, and one high school operated the Nagano Prefectural Board of Education. The Shinshu Honan Junior College is also located in Tatsuno.




International relations

Local attractions


  1. ^ Tatsuno town official statistics(in Japanese)
  2. ^ Tatsuno population statistics
  3. ^ Tatsuno climate data
  4. ^ Y. Iguchi (2009) The ecological impact of an introduced population on a native population in the firefly Luciola cruciata (Coleoptera: Lampyridae).Biodiversity and Conservation, 18: 82119-2126. https://doi.org/10.1007%2Fs10531-009-9576-8.
  5. ^ Asahi Shimbun (Jun 17, 2008; Nagano Chunan edition, p27).
  6. ^ Mainichi Shimbun (Jun 22, 2008; Nagano Nanshin edition, p25).
  7. ^ Yomiuri Shimbun (July 28, 2008; evening edition, p13).