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Ōguchi (大口町, Ōguchi-chō) is a town located in Niwa District, Aichi Prefecture, Japan. As of 1 October 2019, the town had an estimated population of 24,160 in 9547 households,[1] and a population density of 1,775 persons per km². The total area of the town was 13.61 square kilometres (5.25 sq mi).


Reconstructed gate of Ōguchi Castle
Reconstructed gate of Ōguchi Castle
Flag of Ōguchi
Official seal of Ōguchi
Location of Ōguchi in Aichi Prefecture, highlighted in dark yellow
Location of Ōguchi in Aichi Prefecture, highlighted in dark yellow
Ōguchi is located in Japan
Coordinates: 35°19′57″N 136°54′28.1″E / 35.33250°N 136.907806°E / 35.33250; 136.907806Coordinates: 35°19′57″N 136°54′28.1″E / 35.33250°N 136.907806°E / 35.33250; 136.907806
RegionChūbu region
Tōkai region
PrefectureAichi Prefecture
 • MayorMasahiro Suzuki
 • Total13.61 km2 (5.25 sq mi)
 (October 1, 2019)
 • Total24,160
 • Density1,800/km2 (4,600/sq mi)
Time zoneUTC+9 (Japan Standard Time)
- TreeOsmanthus fragrans
- FlowerSakura
Phone number0587-95-1111
AddressShimo-Koguchi 7-chome 155, Ōguchi-chō, Niwa-gun, Aichi-ken 480-0144
WebsiteOfficial website
Ōguchi town hall


Ōguchi is located in the extreme northeast corner of Aichi Prefecture, in the middle of the Nōbi Plain. The Gojō River flows through the town.

Neighboring municipalitiesEdit


Per Japanese census data,[2] the population of Ōguchi has increased steadily over the past 50 years.

Historical population
1940 7,206—    
1950 8,695+20.7%
1960 10,163+16.9%
1970 14,898+46.6%
1980 16,195+8.7%
1990 17,464+7.8%
2000 20,633+18.1%
2010 22,447+8.8%


The town has a climate characterized by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Ōguchi is 15.6 °C. The average annual rainfall is 1819 mm with September as the wettest month. The temperatures are highest on average in August, at around 28.0 °C, and lowest in January, at around 4.1 °C.[3]


The villages of Kashiwamori, Ōta, Ōguchi and Tominari were created within Niwa District, Aichi with the establishment of the modern municipalities system in 1889. On October 1, 1906 Ōta, Ōguchi and Tominari and a portion of Kashiwamori merged to form the village of Ōguchi. It was raised to town status in 1962.


Okuma Corporation and Yamazaki Mazak Corporation, two global machine tool builder companies have their headquarters in the city, as well as global automotive components supplier Tokai Rika.[4][5][6]


Ōguchi has three public elementary schools and one public junior high school operated by the town government, and one public high school operated by the Aichi Prefectural Board of Education..



Ōguchi is not served by passenger rail transport. The nearest train station is Kashiwamori on the Meitetsu Inuyama Line in neighboring Fusō.


Sister city relationsEdit

Local attractionsEdit

Horioato Park Saidan Bridge
Gojo River
  • Ōguchi Castle


  1. ^ Ōguchi Town official statistics (in Japanese)
  2. ^ Ōguchi population statistics
  3. ^ Ōguchi climate data
  4. ^ "Corporate Profile." Okuma Corporation. Retrieved on March 26, 2015.
  5. ^ "About Mazak — Company Outline." Yamazaki Mazak Corporation. Retrieved on March 29, 2015.
  6. ^ "[1]." Tokai Rika. Retrieved on October 05, 2019.

External linksEdit

  Media related to Ōguchi, Aichi at Wikimedia Commons